Ben's plenum

Hello guys, need some help. Got this pic today from my buddy Ben. He finally found the time to print a plenum for my car (the white one on the left side of the picture). Thanks Ben. The idea is to be able to fit an 82mm TB, just like the IPD plenum setup. Sure, it doesn’t have all the bells and whistles as the IPD, and it’s not made out of aluminum, but it should give a quicker acceleration and more torque on the low RPM, and not going to cost over 1K. He made few plenums for the Boxster (plenum on the right), and although It added only 3hp and 3Ft-lb On the dyno, the difference is noticeable in drivability, and expected to be higher on the 3.6L engine (The Boxster was 2.7L engeine and the plenum accepts the 74mm TB). If you like to read more about it: http://986forum.com/forums/diy-proje...ttle-body.html I drove Ben’s car, and I could definitely feel the differences between the stock setup to the upgrade. Anyways, to my question. Can anyone please direct me to a source where I can find the needed silicon elbow, that will fit the larger TB on one side, and the air box on the other? thanks in advance. Meir.

Subscribed!

If its the Ben I think it is, he makes a ball bearing short shiftier as well for $130 (I think)

What does the inside look like? Could be an affordable alternative to the IPD plenum.

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Yep. thats the very same Ben. very talented young man, and a super nice guy. The inside looks like the OEM plenum. it was very important for Ben to respect the IPD�s design, which is patented, even though there are ways around it. So it is built like the OEM plenum inside and out, but can accept the 82mm TB.

Post pictures of the before and after dyno graphs please. Interested in the shape of the curves.

Is there any talks that Ben would be willing to produce a number of these if we can put together a group buy? Interested. B

that's cool. amazing still to me-

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There is a screenshot of the dyno run on page 17(post 345) in the link I posted, from one of the guys that installed the plenum on a 2.7 engine with the 74mm TB. I didn't get main yet, as it needs to be painted on the outside, and polished on the inside. I didn't plan to dyno the car, but i might consider doing it. It shouldent be to difficult to do consecutive runs, as the swap is not too complicated. I cannot speak in his name, but I'm sure that if some people will be interested he will consider that. BTW, I'm still looking for that elbow.

Are there a link to the dyno garfs? nm, got it

I'll wait for your dyno graph. Is the printed material suitable for an automotive environment?

The O.P. asked for help finding Silicone fittings: try these guys for "bending reducers" ? http://www.siliconeintakes.com/ here for "reducing elbows" http://www.hps-siliconehoses.com/hps...ucer-hose.html http://www.autosiliconehoses.com/sil...ne-elbows.html

Ben -the producer(Ben006) of this part is a well known guy on 986 Forum. He produced Ball bearing Shifter for Members. He proved himself to be a 100% decent guy imho..He is an ASE certified Auto Tech and works for a Porsche dealer afaik. NAYYY http://986forum.com/forums/diy-proje...t-shifter.html If you skim the link Meir provided it will give you an impression of Ben and his work. http://986forum.com/forums/diy-proje...ttle-body.html

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i'll be sure to post the dyno graph once i'll have the mod done. for now you can look at the boxster graph. as for the material properties, here is what Ben posted on the 986 forum: "It is made of nylon plastic, which is resistant to oil, fuel and most solvent, and also quite strong (I can stand on it). It is not as stiff as the materiel used for the original parts, why is glass fiber reinforced nylon, hence the need for the stiffening ribs. It is not molded, but made by Selective Laser Sintering, which is a 3D printing process that creates a part really homogenous inside, but with a rough surface. Far superior compared to the Fused Deposit Modelling used by all the "cheap" 3D printers."

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Thanks Schnell. I�m familiar with these websites, but I was kind hoping that someone done a similar mod, and can help me save some time and money by eliminating the trial and error process. Thanks anyway. Your help is much appreciated. I also think I�ll call Ben, and ask him to chime in, so you guys can get some info first hand.

I know Ben and will direct him to this thread so he can add some input.

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Resilient to oil and fuel means little to me. Can is hold up in the environment that it going to spend it's life in? Last think you want is to come apart and get ingested into the engine? What kind of an RD was done on this before it was released to the public? The graph shows basically insignificant change it performance.

Hi guys! It's my first message on rennlist! As Meir said, it's better if I answer your questions in person First, the plenum is made to order, no need to do a group-buy! The first prototype was on my Boxster, stayed in for 20 000miles, a trackday and two autocross, the car still racks up miles in the hands of the new owner. The location of the plenum in the engine bay and the fact that air is circulating inside at all time makes it a relatively cool part, around 70�C is what I measured during the HOT Florida summer. The original part is also made of nylon, but it's a 30% Glass Filled nylon (for strength and rigidity), hence why I made it with ribs and a thicker wall. Also, the way the original plenum is made makes it stiffer (two part bonded together). If you look at your resonance tube, it has reinforcing ribs just like I did for the same reason (limiting deformation under vacuum). Not convinced? Your intake tube is made from a weaker plastic, really thin, and lives perfectly fine at the same temperature (although, not submitted to the same pressure differential). There are currently 6 of my plenums driving around in the US and UK Meir's plenum is the first prototype for the 996, it will work but might need some modifications to make it fit better. It's not just a copy of the original plenum with a bigger hole, I increased the radius between the main tube and the cross tube, as it is proven to be an area of improvement. And here you have the privilege to see my hairy legs to show you the strength of the plenum. I'm not the heaviest, but I'm still resting all my 175lbs on it. On the Boxster, the best result are obtained with an exhaust and at least a K&N drop in filter, that's part of why the graph only shows a 3hp gain (the two dyno runs were done a week apart also), the owner of the car is still very happy with the result as he gained the most under 3000rpm, where he uses the car. Here is a quote from the new owner of my former Boxster 2.7: I expect the 996 to react the same as the boxster did, little gain as a single mod (For the boxster I don't sell them unless you have an exhaust and drop-in filter), but a good add-on to an existing list of mods. Usually, it takes almost a week for the car to adapt to the new throttle body, but the last one to install one reported a difference immediately after installation! Meir's 996 is stock, so we'll see! We are still looking for an intake tube solution Ben

Ben, i would be very interested in getting one of yours. Please let me know thanks! [email removed]

Sample size of 6, with one having only 20K miles. So in another words, there was pretty much zero long term testing before release with very little real world testing since them and the R&D is done by the customers that buy this. Considering how expensive the 996 engines are and the limited testing done (standing on it isn't enough), I would be very cautious to be a guinea pig unless, you have insurance large enough to cover a catastrophic incident (as a business you should have this unless you like to gamble a lot) if/when this part fails. As a side note, this part goes through one heck of a heat range during it's life if you consider what they need to stand up to (anything between the north pole and the Sahara). AND has to do this for the decades. Porsche did extensive extreme weather testing on their parts. Would not be a bad idea to consider doing the something similar.

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You have some valid points there Imo, however it think you are missing some very important facts. This is going to be a long one, so please excuse me for any grammar/spelling errors, as English is not my first language. 1. Ben is not trying to sale anything, and he is not a “business”. He is a Porsche enthusiast (and very creative one if I might add) and a certified mechanic, that works for one of the largest Porsche dealers in the US. He made some mods to his car, and shared the results with the Boxster community. He created a short shifter that beats the s**t of any other shifter I tested, including the $500 ones with the fancy brand names. But since I’m a very skeptic person, I wanted to test it myself before I buy it. Since Ben lives not far away from me, we met for a test drive in his car. Beside the fact the shifter feels awesome and I ordered one right away, I noticed right away that his car feels different. As an owner of 2 Boxsters (99 base and a 2001s) for the past 6 years, I know exactly how they go. That’s when he told me about the plenum. I knew right away I wanted one for my 996, and I will explain later why. The reality as of today is, that there are few Boxsters with his plenum, all are happy with the results, and this is the first and only 996 plenum that yet to be installed. So nobody really knows what will be the resolute. Yet As said in my original post, I’m looking for the silicon elbow. 2. As Ben mentioned, the plenum he is making is made of the same material of the original plenum. The difference is that the OEM part is reinforced with glass fibers. To compensate for the lack of the fibers, his design has thicker walls, and reinforcement ribs. I personally think it’s an overkill (although the ribs looks cool), since the plenum is probably the coolest part in the engine bay, due to the high flow of cool air thru it. Although I agree it will be a good idea to test its condition when the car is idling for an hour let’s say, even if it is not a real life scenario. The reason I’m pretty confident with the construction of Ben’s plenum, have to do with the fact mention by Ben in his post. On the boxter engines, the plenum is not connected to the air box via rubber/ silicon elbow, but using a very thin wall plastic tube. If the thing holds the heat, than Ben’s plenum should last longer the life of the car. 3. About “Porsche did extensive extreme weather testing on their parts”. Too bad they didn’t invest the time to design a better IMS, RMS,AOS. Jukes aside, I’m sure Ben appreciate your comments, as that’s the only way to improve. By thinking what can go wrong. Me personally, I have great confidence in this product, and I’m sure that if something will go wrong with the plenum, I will know long before a “catastrophe” will occur. I just hope I will get the same resounds as Ben and the other guys got on their Boxsters. EDIT: I cannot recommend on the plenum as I didn’t test it yet, but I highly recommend Ben’s ball bearing shifter. If you don’t have one already. . He sold way more then 6, including some 996/997 owners, and i haven’t heard of even one unsatisfied customer.

I don't think I've missed any of the important facts. You can't say "same material of the original plenum." and then the following sentence "The difference is that the OEM part is reinforced with glass fibers." That means it's not the same material at all. R&D that includes long term testing is very important when developing a part, especially when the part is bolted to the intake. I'm sure Ben is an excellent mechanic and that his shifter works well but that's not the issue here and is pretty much irrelevant in this case. Mitigating liability by testing what you are selling is standard operating procedure in the automotive and pretty much every industry. Porsche knew the liability when they made the choice to go with the IMS bearing or any of the other questionable parts. I guarantee you there were extensive meetings and discussions with real life data before a final decision was made. "Me personally, I have great confidence in this product, and I’m sure that if something will go wrong with the plenum, I will know long before a “catastrophe” will occur." How do you know this? It doesn't take much material to keep a valve open and the the fun begins! You work on engines long enough and you'll see all kinds of weird $hit that makes them go boom!

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i guess you are right. only time will tell. just one note about your comment: You can't say "same material of the original plenum." and then the following sentence "The difference is that the OEM part is reinforced with glass fibers." I said the material is the same, as they are both made of nylon. The construction is different, as the OEM is reinforced with glass fiber), while Ben's plenum is reinforced with thicker walls and reinforcement ribs. So at least in theory the rigidity of both parts should be similar. but you are right, it will need to stand the test of time.

Fair warning, this may get pedantic, but such is life: With glass-filled nylon (and all glass-filled polymers, for whatever that's worth), the glass-fill is done prior to the injection moulding. It's not like someone makes a nylon part and then adds glass to it after, glass-fill polymers have distinct material properties than the non-glass filled equivalent. Just consider it a different type of thermoplastic/polyamide. And obviously, yield strength and other stress/strain characteristics all depend on the percentage of glass-fill. Thus, while the move to increase wall-thicknesses and add structural ribbing is a good idea, it's also by definition a workaround to compensate for lesser material strength. The takeaway I think should be: it's not the same material, the design has tried to mitigate risk and be as robust/reliable as possible given the material constraints, and hopefully the field testing will go well. The performance gains seem like they could be compelling, so if it can be made economically, this could be a great value.

So it is a gamble. A small one. That was made clear from the start. There is no hard sell or big profits here.There is no arm twisting to buy the Plenum or even read this Thread. It is just an Announcement of a small diy project with an invitation to participate. It is a project full of good intentions and enthusiasm for the hobby. It may fail. That is also clear. But if we don't try such things (& risk failing), how will we make any progress at such low cost ? Some of us would like to discuss the details and take that chance. Really, what is the worst that could happen ? Perhaps read the link I gave to Ben's previous (Shifter) project.You'll get a feel for the inventor and his skill level. Pity to dismiss the idea without reading the background evidence.

Does it have to be white?

I wouldn't mind being a test subject. I have the drop in K&N and the exhaust. Ben, shoot me a pm and let's see if we can get another testamonial on this thing from a 996 owner!

Exactly. I know well the difference between glass filled nylon and the one the plenums are made off, and as I said, this is why I needed to compensate for the lesser strength with design trick (ribs and wall thickness). The heat and chemical resistance are very close between the two. You guys have basically answered everything already! I can understand the fear of failure, especially if you haven't seen the part in person, but I'm pretty confident with this one. The Boxster ones are longer, with a lot less ribs, and so far have survived well and showed no sign of fatigue (not being glass filled makes it more resistant to fatigue). On that note, look at how much your intake manifolds move when you apply and release the throttle! As Gelb and Meir said, I don't make a living out of that. I won't push anyone into buying anything from me, and never did. I make stuff because I want them, or my friend want them, then other people want them, so I make more I also made a great, cheap throttle pedal extension, I thought it was my best idea and I loved it... nobody ever wanted one ahah! Andrew, I'll e-mail you tonight. So far, the part haven't been tested, even for fitment, so if you want one, you'd be a guinea pig and will have to figure out the intake tube and PCV vent connection (which is still the main question of this thread!). I did that for the Boxster's ones, so why not for the 911's! Bill, nope, I usually paint them outside, it looks better and also seals the surface. The inside stays bare, you don't see it anyway (it does get really dirty though...) I had one guy paint it red to mach the rest of his engine bay came out good! Ben

Excellent and we get real world RL RD.

I have ben's shifter installed on my 996 and very happy.

At least Ben bothered with a dyno run. That puts him ahead of about 90% of other aftermarket suppliers.

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How was it determined that it�s a small gamble? Real wold R&D should be done by the developer before it�s offered to the public. The quote "By failing to prepare, you are preparing to fail." explains the simplest of ways why this is necessary.

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What makes you think the others didn't dyno? The results were not favorably so they don't publish it.

Fair enough. I'll restate: "At least Ben bothered to share dyno results. That puts him ahead of about 90% of other aftermarket suppliers."

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If something goes wrong and causes catastrophic failure to the engine, will you cover the cost of the engine and everything that goes with it?

I wonder if Imo00 just sits on his computer all day and actively looks for things to argue about. 4 posts a day for 14 years straight and still manages to rarely contribute anything constructive has got to be some kind of forum record or something. Can we talk to the mods and try to get him some more flair under his user name maybe? Something like "Admiral Asinine Arguer"?

He reminds me of Francis. Francis is upset. You Tube

HAHAHHAA. Thats perfect. Thats exactly what I had pictured in my head. I cant stop laughing.

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I'm sure he'll line up behind every other aftermarket parts provider to hand you a six-inch-tall stack of 20's to take care of your blown engine. I get s**t for using "pedantic" too often, but...

Considering Imo000 has a KrazyK sourced bearing handling IMSb duties in his non-running 996, I would take his views on risk with a grain of salt.

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Agreed. How sad that such a simple proposal attracts argumentative,negative comments. It leaves the impression the issue is not the diy project but something else. If you have a contribution to make to advance the project -great tell us all about your idea .If you can suggest a way to avoid a problem- even better .If you just had a bad day - seek help elsewhere. Imo is a smart, experienced car guy and an Engineer.He has much to offer in helping us. But Ben actually makes new things and tries them .You can participate if you want .Nobody is coerced into buying anything.It is all up front - just a tinkering diy project. Most of the tinkering we do and discuss on Rennlist comes with risks to the car and ourselves. Why pick on this little issue and this nice guy? This is an example the snippy nonsense that drives people away from the Forum or makes them reluctant to share/ask.A case of ,misdirected browbeating perhaps ? Back to the positive Projects like Ben's save the old car hobby to some extent. No big name company is going to invest in a low volume,low profit item like this .But a few of us would like to try one. It is guys like Ben who help us to keep the community vibrant and enhance our enjoyment of the car and the hobby. So thanks to all of you tinkerers who share your inventions and ideas. Even the bad ones like inappropriate IMSB's. Here is an example from a much maligned but far more valuable car - the Jaguar XKE. The clocks fail. Nobody sells a better clock as a replacement. A wonderful old guy called Mike Eck figured a cheap diy fix. Great, the clocks now run like Swiss watches now. Pity about the rest of the car.....! The supercharged Jag XJR has an issue with a little oil in the s/c system and a collapsing hose causing havoc with emissions. A simple diy Forum hack with a piece of aluminum tube and a small catch can solved it. We need all the help we can get. So all you inventive types -step up and help the M96 enthusiasts please.

As the OP of this thread, I feel free to join the hijack. Let’s shift it a bit from the search for the silicon elbow (although I still need it) and WW 3 that just started, and let me share with you my thoughts about this mod, and why I’m so interested it. At the moment, my car (02 996 C2 40K miles) is stock. I use it as a daily driver, and I do all the work on it myself, just like I did with my previous Porsches. One of the first mods I did on my first Porsche (01 Boxster S) was removing the cats and installing the bypass pipes. Everyone was recommending it, and talking about the improvement in performance, and some vendors even showed dyno graphs with increase of 10-15 HP. Since I’m the last guy in the world that will drink the Kool-Aid, let me tell you my opinion on that mod. About HP gain, I don’t know. I never dyno’ed the car. From feel point of view, it definitely felt quicker and stronger on the high RPM, but also felt flat and slow (like its missing torque) on the low RPM. I can care less about additional 10-15 HP at 6500-7000 RPM. Sure, if you go to the track on regular basis, go for it. I want more power on takeoff. For a daily driver that lives between the 2K-4K RPM not only that it doesn’t add, it eventually disrupts. So two months after the bypass pipe installation, the cats went back on the car. This is my impression (on the 986 not sure how it’s on the 996) and my own personal opinion, if someone has an opinion of his own about this mod, he is more than welcome to share with us. Now back to the plenum. As mentioned on my previous post, I came across the plenum by mistake while I was evaluating Ben’s short shifter. And even though his car had aftermarket exhaust, headers and bypass pipes, there was still plenty of torque on the low RPM. The dyno run showed previously was done on a car with no mods at all. It clearly shows that although the gain in HP and torque is minor (3HP and 3Ftlb), the torque band is showing sooner on the low RPM (I hope I word it right). Now let me throw another mod to the mix. UDP. The UDP ids probably the “best bang for the buck”, and I never heard about someone saying that he is unhappy from this mod, or feel no difference in performance. Can anyone guess how many HP you gain by adding a UDP? Let me help you: You Tube Bottom line, we are talking here about a pure DIY project. Dyno numbers means nothing to me. If I will feel the car will response and drive better (just like with the UDP), then I will be happy. Some points to clear for those who are still in doubt. None is soliciting anyone to buy this product. It is not “offered to the public”, “seating on a shelf”, “for sale on ebay” or any other website. I’m just sharing my personal experiment, and if one wishes to participate, he is more than welcome. The more opinions we get the better. Ben spent a lot of time designing this product on the CAD per my request, and based on my obligation to buy one part. I’m very thankful for that, no matter what will be the final result Worst case scenario I will to end up with a super cool TIG rod holder for my work bench.

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Until you're familiar with the backstory, calling Imo out for that is weak. In fact, the guy deserves props for trying to flag off a possible disaster.

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The new American way for many people, it appears, is to do nothing except sit back and wait to criticize whoever actually bothers making an effort. This way you're never actually at fault for doing anything wrong, but you are in a great position to point out someone else's shortcomings. Now if you'll excuse me, I'm going to go mock some random strangers on imgur or crush some tender self images via r/roastme...

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He was cheerleading the KrazyK experiment through installation. One of his last comments was "looking forward to how this turns out." The guy has a strange agenda. Buys a compromised car with the goal to have the cheapest running 996, ends up pouring time, effort & $ into it only to fail. Uses questionable parts for his builds, mocks anything but backwater budget builds & has still failed to put on any significant mileage in his car. None of this stops him from acting like a master mechanic, of course.

Master Mechanic ? - To be fair, IMO is an Engineer.So he could help us.

I don't think the part of the story where people were excited to do something new and potentially useful - which is the part where im0 was obliquely involved - was the crux of what would become a cautionary tale about the inevitable fall that comes with unbridled hubris and unchecked ego. But I really suck at reading comprehension, and words are hard.

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Theoretically, if he had a sound understanding of risk. In reality, his affinity for cheating "the system" seems to override common sense. You and I have different understandings of the word oblique.

I see what you're getting at, but even if I squint I can't see it like you do. If I manage to persuade someone on the internet to screw the pooch, _maybe_ that's on me - but any bad mojo created by their failure to reveal to its next owner that THEIR pooch has endured months of meth-fuelled barebacking doesn't land back on me. This analogy turned weird.

I also have Bens shifter on my 996 and its excellent.

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Agreed. Ive been listening to it for literally for over a decade. Its like a bad record over and over again. Find a new song already gees. Anyway, rant off. Sorry, not sorry.

Hi guys! We have a second tester, andrew, that is willing to give it a try and help me make it better! Do you know the diameter of the 996 MAF tube? 3.5" or 3 1/8"? I should be painting Meir's one today Ben

I decided not to be lazy and walk to the garage. It's 3 1/2 So the 45˚ COUPLER 3.5" should work

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Cheerleading??? I fix all my cars with my two hand, this is a rarity in the 996 world. The 996 will run before the end of the year. Failure is part of experimenting and the bearing I used was experimental and I clearly stated this in my engine repair thread. I've told this to KK when he asked for my source for the bearing. I've cautioned him to do it at his own risk and sent him a PM as soon as I knew that my bearing was failing. He choose not to inform the new owner of his car and then, a few month later, that bearing competently came apart. If I did what is happening here, I would be offering this bearing to the public before it even goes into my engine. Can you guys see the difference? I've shifted my priorities from fixing other RL'es cars to ONLY mine. Other than my son's go kart, no new projects for me until 996 running again. Also, I don't sell the parts I make to anyone before proper testing and that's my point here. Go on the 928 forum and see what happens when someone tries to sell something without testing. I only made and sold one part but I did stress test every single one that I sold. Proper testing before release is basic part of risk management. Mock me as long as you want but this is how $hit goes sideways when no testing is done.

Per normal policy, I'll refrain from mocking your failures until you start acting like something you are not. For example, acting like a reputable mechanic.

[Image-only post; no author-written text. Original image references:] https://goo.gl/YV4vLv

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I'm a gearhead, not a mechanic but I think I'm reputable, at least in my own mind. Was asked to become a mechanic when I finished college but wanted nothing to do with it as a profession. Main reason: Have you ever seen a happy mechanic? I haven't. The ones I know, they ALL lost the passion as soon as the hobby became their profession. Failure is part of experimenting. You should give it a try. The shoehorned supercharger in my 928 has been in place for 12 years. I've eyeball engineered, designed and built the entire setup myself. That was a fun experiment too.

We're trying to discuss a connector for a plenum experiment. Could those of you who want to discuss "other" things do your thing somewhere else please ? Back to plenums and connectors. Where were we? 3-1/2" 45 degree coupler: http://www.hps-siliconehoses.com/hps...pler-hose.html 3-1/2" converts to roughly 89mm A shorter coupling may fit better? Amazon Amazon

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Hi Imo. I will appreciate if you could direct me to any place in this thread that made you believe I’m “offering the plenum to the public” (or any other product for that matter) and I will edit it, so other readers will not be under the same wrong impression. The goal of this thread (once again), is to share my experiment/ experience, and hopefully get some good info about the silicon elbow I need. Thanks in advance. Meir.

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I would love to keep this thread focused on the topic, but you know how that is Back to the subject: given that the hose is 3 1/2 all the way through, I am planning to cut it for the right length. If the one you proposed Amazon is too short, no one can stretch it out. And as for sizing, the ~89mm is about what the airbox and the 82mm throttle body seem to be on the outside. If it is a millimeter or two off, it shouldn't be a problem. BUT we'll know early next week when I try it out (i'm out of town for the weekend) BTW, that leads me to believe that the Porsche plan was to have it at 82mm all the way through, but you can't make those cheap base Carreras be too close to GT2

The intake hose is pretty straightforward if you're saying with the stock throttle body diameter. My car is running an aftermarket plenum --> stock throttle body --> this silicon hose* with a simple expansion plug from home depot to cover the airbox baffle. This setup improves sound, which is all I really care about. There's another thread where the plug & hose are referenced by another RLer. * http://www.ebay.com/itm/271856058795?rmvSB=true

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Thanks. I�ve seen these on eBay, but wasn�t sure as they do not specify the ID of the tube.

I've had one on for a few thousand miles and while the fit could be better, it works. No need to continually refit the hose, it stays put. They come with fasteners & can improve induction sound for $50 without risking MAF fouling or getting codes like I got with the Fabspeed intake. There are some other guys around that run this setup.

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What made you think I was ever referring to you?

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Thanks Tony. I ordered one. Should arrive next week, so I�ll try to get together with Ben for that following weekend, and see how everything fits.

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maybe your comment on post 17: "Resilient to oil and fuel means little to me. Can is hold up in the environment that it going to spend it's life in? Last think you want is to come apart and get ingested into the engine? What kind of an RD was done on this before it was released to the public? " but let's put that aside, as i think it is already clear that the R&D process that started with Ben's car is continuing now. his plenum runs strong for over 20K miles including track and DE days in the florida heat. i'm not sure how good of a guinea pig i will be, as i'm averaging 6K per year, but the plane is to inspect the plenum regularly on the outside, and pull it out for internal inspection 4 times a year between my 3K oil changes. my concern is more about the gain in performance, less from the structural integrity of the part.

Among our Fellow Forum Members there may be some who are in the plastics business and could give us some ideas on specifically what to look for on the degradation subject. Heat is an issue but at what level? How significant is the combination of heat+oil+vibration+heat cycling in the degradation process and how long would it take before the part became too brittle/crack/soften ? My limited experience molding glass-filled Nylon 66 and modified pvc was a non-automotive environment. At least you will not have to deal with u.v. degradation or moisture ! I realize you are printing this part but am anticipating great success (cheering from the sidelines) and the need for volume production . For those who belittle such cheering - it is so much nicer than sneering from the sidelines. It may be that a plenum in this environment molded from unmodified pvc will have a life expectancy of only 10-20 years ? That would be O.K. Ben would need to find a small molder who was already using a modified base for other customers -for example pvc compounded with Tin or Lead.Maybe some of this applies to the compounds used in printing also ? Anyway, glad we are back to the tech details of out little community diy project.

Ben, is the model public domain, or are you keeping the 3D model under wraps? It would be fun/challenging/interesting to print one of these out on my Makerbot to use as a mold core and try making an aluminum casting. (no, I don't have a "real" forge, but I have bricks, plenty scrap aluminum from some wheels, and heat sources... (If anyone else is interested: you can use PLA printed parts to mimic lost-wax casting. "...this next method is our favorite as it mimics traditional jewelry wax casting, but the original 3D print is destroyed in the process. Again, take an empty 2-part mold and fill the bottom piece 1/3 full of sand, place the piece you are casting in the center and carefully pack sand around it as you go. Make sure you end up with the flat or bottom of the piece facing up. [...] Once the molded piece in in place, turn it gently upside down and place it on a drip pan in your oven at 400 degrees to allow the PLA to melt out over time. This generally takes 4-6 hours depending on the 3D print size.")

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I still don't understand how this is referring to you. As far as I can tell, Ben doesn't have a 996 so no R&D process was done on a 996. How can you not understand this? The 20K mile testing was done on a Boxter where the part is completely different than the one that will go on a 996. If the part was the same then maybe the data could be used as an R&D for the 996. However that's still only 20K miles on a single engine. Can't be that difficult to understand (English is my second language too) the basic concept of why proper testing is a good idea before offering something like this to the public. Or is it?

They are confident in their build process and sounds like they are very honest about the product testing, or lack of it. Curious - why does this bother you so much Imo000? Let them do their thing, its not like you are going to buy the product.

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On the plus side, Ben's ideas haven't led to an m96 experiencing catastrophic engine failure. The same can't be said for your experiments. Every now and again the world gives us excellent opportunities to shut the f*** up. You should take this one.

Imo nobody in this Thread accused you of being Canadian as an epithet. That is not how Rennlist operates. As others have eloquently indicated your issue is one of being argumentative and interfering . You don't like the project.O.K. already we got that.Thanks for your opinion as an Engineer and a long time Pcar guy. Now can you please leave us alone and stop bullying your way into our conversation. We just want to develop out little diy project - without you or your attitude.

I refuse to be the voice of civility in any thread - but damn. Can't we all get along? I guess not.

Hannibal was extremely effective when dealing with recalcitrance: eviscerate where needed, civility be damned. Now, if we could get some dynos with these setups, we might answer some questions. I could probably do one this summer but being at 4200' ASL may not be of much use.

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Ofcourse not, Ben hasn't experimented anything on a 996 yet. Not even a prototype has been made yet. My experiemnt was for myself not for the public to conduct (I didn't release parts to the public before testing was done), so why do you care what the outcome was? Good or bad, I always freely shared my experience when it comes to trying anything on a car. This is how the DIY gearhead community works. People try things for themselves and share the experience so others can learn from it. Using others a s a test sublject is OK as long as both parties fully undersntand what happens when things go wrong. I see what you are doing but it's not there. Would also be a good idea to kee the personal inults out of this forum, this is a technical forum, keep the topic technical.

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In all fairness there are more people than not that would likely want you to STFU. Its like you feel obligated to ramble post. Quit it and im sure attitudes will change.

bumping for Gonzo

Of course no testing has been done on a 996... since this post is about the oncoming testing on a 996. Conditions on a 996 will be easier for the plenum, cooler, the plenum is smaller, and has more reinforcement than the 986 one, like I said previously. The first prototype is painted and cleaned, I hope to test it with Meir soon! Andrew's one will show up soon! I will keep the 3D model, even though the 996's is fairly straight forward compared to the 986's. I've contacted a foundry to make it out of aluminum, since it's a material that people tend to trust more (even if it's less suited for a N/A intake part). The problem was quantity, I had to make 30 to match the 3D printed price, which is a huge investment for me, in money and time (once cast, you need to machine it, and it's not as simple as throwing the part on a machine and go, especially when you start to make a small series). Trying it yourself, why not? Though casting hollow parts is not easy, you can take a regular 996 plenum and try to replicate it first! For the tube, I like the straight elbow idea, since we can always cut it to size, that's how I did for the boxster, a puzzle of cut universal intake tube and elbow. Work pretty well in the end! The plenum is a bit shorter but the throttle body is a bit longer. We'll see! Ben

Of course no testing has been done on a 996... since this post is about the oncoming testing on a 996. Conditions on a 996 will be easier for the plenum, cooler, the plenum is smaller, and has more reinforcement than the 986 one, like I said previously. The first prototype is painted and cleaned, I hope to test it with Meir soon! Andrew's one will show up soon! I will keep the 3D model, even though the 996's is fairly straight forward compared to the 986's. I've contacted a foundry to make it out of aluminum, since it's a material that people tend to trust more (even if it's less suited for a N/A intake part). The problem was quantity, I had to make 30 to match the 3D printed price, which is a huge investment for me, in money and time (once cast, you need to machine it, and it's not as simple as throwing the part on a machine and go, especially when you start to make a small series). Trying it yourself, why not? Though casting hollow parts is not easy, you can take a regular 996 plenum and try to replicate it first! For the tube, I like the straight tube idea, since we can always cut it to size, that's how I did for the boxster, a puzzle of cut universal intake tube and elbow. Work pretty well in the end! The plenum is a bit shorter but the throttle body is a bit longer. We'll see! Ben

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Groupthink https://en.wikipedia.org/wiki/Groupthink

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hahaha. lols, no dude. Youre just annoying.

I've never heard someone use a group think heuristic defense when being told to **** off. Anyhow, here's the g-pipe & cap. Changed the oil this week. Happy motoring.

whats that pink thing on the intake box?

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Helmholtz resonator delete. This was originally known as the "orange cap" mod when someone realized that the cap from an Edge shaving creme can fit perfectly after removing the stock hose. The pink/red cap with the expanding plug is a nice little update to the orange cap.

adds noise?

yeah - it sounds great to me. I love it with this setup and am tempted to not toy around with exhaust because the soundtrack is so enjoyable. The cap is very durable & not expensive. I opted to go as big as possible to lower reliance on the expansion. Even if the screw loosens it should stay put. The silicon hose is coolant-grade stuff from what I understand so risk is well within my tolerance. Safer than aftermarket stuff imho & no worries going through the car wash anymore

Expansion Cap = Home Depot . No P-car tax.

^exactly, borrowed the idear from another thread. Total cost under $50 all said & done.

No need to get the silicone hose and that cap. All this can be done with the factory hose and a shaving cap. I've done this to my 996 and at the end everything looks stock. Total cost $0.

Man, I'd heard the Ben's Plenum thread was interesting, and it sure is! I almost went to make popcorn while reading the whole thread. Now I think I actually will because popcorn is food, and inside I'm a ten year old fat kid.

Careful, I'll make fun of you. And get yelled at.

I posted an answer yesterday, looks like it's still "waiting for approval"? The plenum is painted, ready to go in!

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Musn't make fun of the fat ones sir Schnell, twill upset the Puritan ones round these parts...

You know a guy has intellectual integrity when he simultaneously decries fat shaming while threatening to fat shame. Further proof that money doesn't guarantee intelligence, and vice versa.

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Well if it's a Rolex kind of thing I can assure all I have no intellectual integrity. My rolex is fake. Even my Rolex has no integrity. And I have no money, blew it all on the car. And all the things that broke on it. Am I good to go on the fat shamming?

Finally clicked on this thread after giggling at how "Ben's plenum" was way too similar sounding to Ben's "perineum" (Google it if you must). Either way I was not disappointed in the entertainment value....

Dude, we've resisted using the P word for almost 100 poasts! We can't be learned doctors if we lose our discipline. Now, if you'll excuse me, it's time to open an "Imo000's hole plug" thread to investigate his free intake solution. B-ran yer good to go as long as you don't actually push someone down a road of thought that isn't earned. I finally dug out from my self-induced p-car poverty. Refreshed interior & drivetrain is a costly endeavor but damn it's fun to product test.

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Well I'm in luck! I don't push anyone down a road of thought, I just push them down roads, after I've tied them to a wheel chair. I've been in self induced p-car poverty for a couple years. But it's mostly just maintaining existence, never really fun stuff. Alas, one day I shall do fun things to the car. One day. What were the interior and drivetrain refreshing that you did? And regarding Imo's hole plug, I think I'll pass. I have a weak stomach and don't care for graphic imagery.

Center console from drab gray to gt silver, same for the horseshoe, trim & gauge splash. Then a leather instrument cluster section & center console delete. Replaced some of the trim on the driver side rail, conditioned the leather half a dozen times to soften it up. Drivetrain items included a 997 shifter, ims solution, engine out refresh incl. AOS, motor mounts, peripheral hardware that could use replacing, oil cooler line with a pin hole leak, plugs, coils, plenum. Fun stuff so far is limited but solid H&R sways are great for sweepers, spacers to fill out the wheel wells & I'm conflicted on suspension. SLC is a western, truck-friendly town that rewards a bit of clearance. Anyhow, the updated version is a good bit more rewarding & it actually feels like my car after a bit of effort. Took a year and a bit of coin but it's a rewarding process. Couldn't locate a trim piece to match the shifter so will eventually swap that out with a matching color piece. The legroom with the console delete is very nice - that was about the only thing that bothered me before while driving.

[QUOTE=TonyTwoBags;14109941]Center console from drab gray to gt silver, same for the horseshoe, trim & gauge splash. Then a leather instrument cluster section & center console delete. Replaced some of the trim on the driver side rail, conditioned the leather half a dozen times to soften it up. Drivetrain items included a 997 shifter, ims solution, engine out refresh incl. AOS, motor mounts, peripheral hardware that could use replacing, oil cooler line with a pin hole leak, plugs, coils, plenum. Fun stuff so far is limited but solid H&R sways are great for sweepers, spacers to fill out the wheel wells & I'm conflicted on suspension. SLC is a western, truck-friendly town that rewards a bit of clearance. Anyhow, the updated version is a good bit more rewarding & it actually feels like my car after a bit of effort. Took a year and a bit of coin but it's a rewarding process. Couldn't locate a trim piece to match the shifter so will eventually swap that out with a matching color piece. The legroom with the console delete is very nice - that was about the only thing that bothered me before while driving. The interior looks fantastic! I've thought about doing the center console delete for more legroom also. But it would interfere with my idea of some day (read probably never) putting in a touch screen head unit with nav. I may take some cues from your interior refresh to spruce up the super blackness of my black on black interior, and paint some trim pieces. How are you liking the 997 shifter? I've driven a 997 S and I really loved the feel of the shifter. It could also be that mine is a bit worn out and old and should just be put out to pasture. Also how much of a pain was it to drop the engine? I'm toying with the idea of maybe doing that as a winter project. Or a summer project if my AOS goes, but hopefully not a summer project.

Ty - just go piece by piece & be patient with eBay. I paid 10-20 cents on the dollar against the Suncoast prices for the big stuff & only broke down to pay full price for the trim strips & console delete. The 997 shifter is great. Either that or the GT3 shifter (metal bushings) or the Function First set (same) or Ben's shifter setup or the other race-oriented one I forget the name of are all good options from what I've read. The engine work was done by a shop and wasn't planned but elected to do it based on what they found.

I love this forum! I have stayed out of this for the most part. Ben, thanks for contacting me. I would love to be a test subject but figured for a test subject, shouldn't cost that much at this phase. Once it's all figured out I look forward to hearing/seeing results and by then might be able to get in on it. For those crying out for Ben's lynching, I would nicely say, get over it. We are all big boys and girls and if someone wants to take a risk with their own car and try this out before "R&D" has been done, that's their choice. I appreciate what Ben (and those like him) are trying to do. Parts for our cars are stupidly over priced so I say keep on keeping on! See you all in Vegas in a couple months!

stock to 82mm upgrade with Ben's plenum (stock plenum is upside down in this photo) See https://rennlist.com/g/album/7341244 for more photos I was able to install it myself within about 1.5 hours. I had to plug the extra outlet on the plenum and spend a whole lot of time adjusting the size for the intake hose that I had to purchase ( Amazon Amazon was about 2 inches longer than I needed), but overall it wasn't too much trouble and everything fit well. The engine took few minutes to adjust but after the RPMs got stable and engine warmed up I took it for the same route I take few times a week. Nice twisty road with few straights where I could really step on it and get a feel for it. I sure do love the results. It was much hotter weather than a few days ago, the butt dyno tells me that it is quicker and more responsive, plus it added a nice deeper note to the engine. I can't put my finger on it, but the way the RPMs build up is different, so it feels a little bit like driving a different model of the same car. Price per performance and ease of install make this modification as appealing as Ghundo hack, if not better.

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For both metrics mentioned (bang for the buck and ease of install), in my opinion, the Fister cans win first prize, and the Tarrett-type (read: indestructible/non-skeletonized) underdrive pulley comes in a close second. I would not have listed a plenum as a bang-for-the-buck upgrade based on IPD-type pricing, but for $300...hm. *edited* because I was being an idiot...

I wish I could sell it 800$ ahah Plenum is (will be) 300$, and a GT3 can be found around 150

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I have the Ghundo hack, and.... I think this was easier and better. I was able to do the work in under 2 hours, where dealing with the mufflers took me a whole lot longer and I ended up spending more $. So effort required was a lot less here in my case. Let's not forget the third metrics that this mod might have a pony or two that it brings.

Cool stuff Andrew/Ben, the only thing that sticks out to me is maybe the girth on the TB connections. On the OEM piece they're yudge with reinforcements.

Thanks I don't understand what you mean?

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The attachment points on the plenum that connect it to the throttle body. On the left-hand side they're larger & reinforced with metal seats for the connecting screws. On the right-hand side they're composite & smaller in size. Just thinking of the tensile strength and/or fatigue properties of your unit over time. The plenum itself looks to be more robust, while the TB attachment points seem to be less so.

I see! I don't use the same method as the original plenum. They use insert that they put during the molding process, while a use a nut sunk into the plastic from the other side! I'll try to find a good picture of it I was thinking of making it a bit thicker. The 986 plenum is thicker there. edit: you can see it there:

Ah, that makes sense. Cool idea on the embedded nut. I imagine that area gets a lot of bouncing around between RPM cycles & the like. Thanks for the clarification.

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Sorry to dig up this thread again, but I am now in a position to try this out. Andrew, how is yours running? Worth it? I am jus looking for a bit of a different sound and a few extra HP if possible. I sent a PM to Ben so we'll see.

Hi guys! I haven't had time to keep the thread alive, I just moved back to France and I'm not fully set up yet :/ I know Meir hasn't had time to install his plenum yet either. I have to make change to it to make the flange thicker, nothing major though. Then once I'm all settled I'll start to offer them to those who want If you have any comment or suggestion, feel free Thanks! Ben

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I'm loving it and got a nice compliment for it at a PCA autocross event too. I didn't dyno the car but feels more responsive with a deeper tone somewhere in the back. No issues after 2.5 k miles

Glad to hear that! I bought another boxster, an S this time and will install one of my plenums soon. We'll see how it handles winter time too since I'm not in Florida anymore

Ben, I just sent you another PM. Would like to get one of these. Andrew, if I am able to get one, can I reach out to you if I can't figure the install out? Any pics of everything installed? Go Hawks!

Two more 996 plenum out soon + a 986 on the way!

Ordered! Can't wait to get it.

Just been messaging back and forth about this too...Im in as well. What elbow are you going to use for the intake?

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I messaged Andrew a while back and asked which one he bought and I have not received a reply yet. I guess I will have to wait until the Throttlebody and Aplenum get here before I can buy the elbow.

I'm 99% sure you need a 3.5" (that I'm sure) 45� angle hose (Not sur about the angle, but I think it's that!) For example: http://www.ebay.com/itm/3-4-PLY-LAYE....c100005.m1851

yes. you will need 3.5" 45 degree. try to find one that is long, and cut it to size. the end that goes to the TB should be longer if you want a perfect fit. that is the reason why i still have my setup on the shelf. the elbow i got was too short. i'll get back to it when the weather cools down and i will have the time.

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Oh boy! Where are you guys sourcing the GT3 throttle body from?

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around $170 on eBay.

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I found one new on line for $125 shipped.

So Im finding several P-cars having the same part number, does it matter? Seems they are in 911, Cayenne, GT3, Panamera....will it all work the same?? Part # 997.605.116.01 And I should get a gasket, right?

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thats the part number I ordered. I believe Bens plenum arrived today! I will try to get it installed this week! Here is where I got my tb: http://www.importecwarehouse.com/Por...1601-SF-14.htm

Awesome, thank you for the link, I will be ordering the throttle body shortly... what did you guys do for a tune? Softronics, Evoms or just install and see how the computer adapts to it?

No gasket, you have to use RTV sealant to seal the throttle body to the plenum. The groove is there to guide you and avoid excess sealant from getting spread everywhere. You don't need to put a lot, just a 1mm thick bead. The DME should adapt to the new TB in about 5 days, but a tune will surely give you more power. I know softronics can help you with your setup Ben

All parts have arrived!!! I guess I have a project this weekend. Thanks again Ben!

Give us your feedback when it's on! I hope you'll like it

Just ordered everything for this swap today.. Will post my thoughts once I get it all and throw it on..

Dang the plenum is a hard thing to remove then reinstall. I think I got it all squared away tonight. Bens plenum is not sitting completely flush so I am hoping I won�t have an air leak. I will give it a shot tomorrow. If a leak is detected, I will remove everything and start over.

Please explain what you mean by sitting flush?

i assume the throttle body mount part is not completly flat? if thats it the best thing is probably to sand it down a little

No, I am talking about the plenum itself. It is not sitting even on the left and right side where the rubber connectors are. I am sure it�s user error. I am going to give it a go today to see if any air leaks are detected, if not, I am not going to worry about it.

When you fit the plenum, losen all 4 clamps as much as they can, it makes it way easier to fit and adjust.

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Thanks Ben. I will give this a try if I have to take it all apart again.

yeah getting it all mounted is a pain in the rear, i had the same issue when i did my ipd one

Well, went out and turned the ignition and it promptly dies before getting started. Guess I will start over next weekend.

The boots can be hard to fit correctly... If you do like I said: undo the clamps to the max you should get more flexibility and be able to fit them correctly.

HawkFan... one of the guys posted a series of pics with the IPD Plenum in Facebook Porsche 911 (996) page, take a look: https://www.facebook.com/groups/246437298860832/?fref=nf then wiggle the other ends in and tighten.

Be careful of the fittings on those boots...you don't want to tear or crimp a connector.

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Looks like the post was removed...a step by step DIY would be a good thing. 😜

Its there if you do a search of the group....just search plenum. Keep us posted.

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which Facebook page, there are a number of them, never mind, I found it! Thanks for pointing me there.

Ok so was able to get everything installed, tightened up, and the car fired right up. I will take it out for a drive tomorrow after work. Here are some pics. If anyone else is planning to do this, let me know if you have any questions.

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Where did you source the elbow? Does it fit well or is longer better?

Looking at the ends (as well as an earlier post) it appears he ordered a longer one and then cut it to size. Hawkfan, I ordered a plenum from Ben after seeing this thread (as well as an elbow and the gt3 TB). He mentioned that I may have to block off or cap a line/hole? Was this 100% plug and play or did some small modifications need to be made? My car is a stock 04 C4S 3.6l if that matters. Thanks EDIT: I guess looking online it appears that where the elbow is just an elbow with no lines going to it. I believe my car has 2 (one to the airbox which I see you have capped off as well as one that goes to a vac line)? I am not home right now so I cannot verify but just want to make sure I have all the equipment once my stuff arrives..

Here is the link to the elbow i bought. https://rover.ebay.com/rover/0/0/0?m...2F162696420134 I had to trim it a bit to fit.

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yeah, I already had done the resonator delete/orange cap mod.

Got ya. So does the vac line that was previously connected to the factory airbox piping now go directly to the plenum? Was any adapater required or does it just fit right on bens plenum? Also where did you get the cap used to cover the airbox hole? Ive searched and apparently there was some company sending out sample plastic parts that worked.. But thats done and I would rather not use a shaving cap haha Thanks

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Not sure what you mean about the piping from the air box. if you google Oatey 33401 you can find various places to buy the plug.

I circled the two hoses going to the plenum.. Are these both in the same location on the factory plenum? I may have been confused and looking at online pics of a different engine but one engine I saw had an additional line to the factory airbox-tb piping.. I thought the factory plenum only had one line going to it (from pictures I have seen).. I may just be imagining things though.. Thanks

Ok now I know what you mean. So the stock Plenum has one hole. Those 2 hoses are joined by a y connector that plugs in the stock Plenum. With Bens, you disconnect the two hoses from the y connector, and they both fit on to Bens Plenum on their individual hole. The smaller one fits directly on, the larger one you need to use the piece of hose that Ben sends with the plenum to connect the two. I can take close up pics tonight. If you are doing this, PM me and I can give you my number if you need help with the install.

First drive: noticeably better/smoother acceleration and a much richer sound. I will drive it tomorrow and push the higher end of the rpms to see how it reacts.

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Good to know that you were able to fit everything correctly Let the DME adapt to the new setup and it should free up a few more horses! It's nice to see that you help each other, being in a different time zone I have a hard time keeping up sometimes! Thanks guys! Ben.

Yeah I got Hawkfans number and talked about the install. I got everything cleared up so hopefully no issues once all my parts arrive.. Will post my findings as well once everything is here and I get it installed

Got my throttle body yesterday. Waiting on intake today. Then when the plenum comes I am good to go!!

I'm painting it tomorrow!

Ben, so far so good. How�s business?? 😜

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looks like more 986 guys are buying 996 these days

Ben are-there any options for the early 3.4 engine with cable throttle body??

Unfortunately, no... Same goes for the 2.5 boxster. It's hard to find a bigger throttle body for those models that have the same IAC valve. Unless you know what to use? If you do, we maybe can work somehting out Hawkfan, if everything is good now, it should stay that way. If something was wrong, you would have noticed by now I hope you like it! Business is good, I wish days were 48h and I had the energy to last through the whole day! Today I'm focusing on shifters! 10 will be ready by tomorrow! <iframe src="https://www.facebook.com/plugins/video.php?href=https%3A%2F%2Fwww.facebook.com%2Fbenjamin.nenert%2Fvideos %2F10214817516849889%2F&show_text=0&width=560" width="560" height="315" style="border:none;overflow:hidden" scrolling="no" frameborder="0" allowTransparency="true" allowFullScreen="true"></iframe>

There you go, 10 shifters ready to sell! And Mdnyte's plenum

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What do you sell the shifters for? DIY install?

I do, full ball bearing short shifters that I modify myself from generic short shifters! I have a short video of the install too: You Tube

I have had a shifter now since earlier this year, works great, for the money its the best option i think

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Perhaps this shifter should also be in the plenum shipment?

The first plenum/short shifter combo

I don�t think you ever said how much you sell the shifter for... 😁

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Right! 115� shipped

If you're looking for an inexpensive way to increase the bore of your throttlebody to go with something like this plenum, give these guys a try. http://www.maxbore.com/europeanpictures.html $125 to bore your throttle body out to whatever size the 996 throttle will support.

Most of the time, it's cheaper to buy another throttle body. But for the 3.4 that might be a good solution! Now that I think about it... my lathe might be large enough for a throttle body! But then I don't know what throttle plate to use. Thanks for the link

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$125 gets you a larger GT3 TB shipped.

It was also suggested to me that the smaller 76mm throttle body (Part# 948.605.115.03) might be a better fit for the 3.6L engine and still have the same bolt pattern as the GT3 throttle body. So we could use it one the plenum also. What do you think Ben?

All 996 e-gas (so the 3.6), 997 and 987 already and at least a 74mm (or 76, depends where you measure!) throttle body. Only the 2 gen 996 have a 83mm TB. The first gen (360hp GT3) has a smaller one (I'll verify that tomorrow, we have a 1st gen GT3 engine out at work). I just received an e-mail that may get you excited guys! But more on that later

Shifter ordered Thanks Ben

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Ben, I have your shifter and it works great but I wanted to mention to you another small improvement you can make. Where the screw goes there are washers. These washers are not adequate once installed and it still leaves a bit of play or "wiggle". Maybe you could add one more washer to tighten up the shifter so it has no play and it passes the "Wiggle test". This explains what im talking about. Your shifter is a great improvement. With this extra bit I believe it would be perfect! You Tube

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waiting to here what the good news is?

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The red washers? Did you try to tighten the nut? It might be enough. I'm working on something better than those red washer, but I want to keep it low cost :/

Update: so it�s been about a month now. To be fair I don�t drive the car much, but outside of the richer sound and smoother acceleration, I haven�t noticed any power gains. I have not tuned it so take my results for what they are. On on a separate note, Bens shifter looks exactly like this Ebay listing: https://rover.ebay.com/rover/0/0/0?m...2F321485418848 I wonder how they compare?

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they don�t look alike. They are the same. The only difference is, that Ben spends time machining the shafts to high tolerance smooth surface, and adds roller bearings to the bushings. Maks a whole of a difference. I own both by the way. The eBay one and Ben�s.

You have to drive the car for at least a complete week to feel an improvement. For the DME to adapt. The eBay listing is available anymore, but I can guess what shifter it was They are not exactly the same! I do use them, but as a basis for mine! I redo them were it matters and once installed, even though eBay shifters are good enough, they don't compare with mine or any other good shifters Ben

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Ok so I tried to install the plenum yesterday and finally got it in there. Boy, wasn't as easy as I thought it would be. I have a question regarding the Y connector, did you yank them apart or did you cut it...Doesnt seem to want to seperate?

Ben, what's the temparature limit of the plastic used and do you have reference pics of the part installed and used in hot climate for some time? Will it keep it's form?

Yes, it's the same material used for the original intake plenum, but not glass filled. That's why it's thicker than the original one and has ribs, to make up for the G.F. reinforcement. It will whistand about the same temperature. The plenum doesn't get very hot. Around 70�C in a boxster. I used it on my car (986 2.7) for at least 15 000miles, and the new owner still has it since almost a year ago, and drives it everiday. All that in South Florida. I don't have one on my new 986S yet... mostly because I don't have to time to install it. I'm going to slow down the plenums for a while because I'm working on... new plenum! And with the winter it takes me forever to make them (especially paint them). Ben

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I didn�t use the Y connector.

I get that, but did you cut the connector off or is there any easy way to remove it...?

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As I recall it just pulls out.

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OK, thanks!

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new plenum? But I just got mine. Lol!

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Yeah, me too...WTF? 😢

i need one plenum whats the price and how do i order ?

Probably just message Ben or email him. He will probably check this soon. I installed plenum and throttle body. I added a Evoms Intake also....so far sounds a little deeper and throatier. Pedal response seems much better. Thanks Ben! planning to tackle the short throw shifter this weekend!

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Ben stated he is working on a new one so might be worth waiting until he brings that out. But yes, PM him and he will get back to you.

i cant pm im too new

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You're not to new...sign up and become a member.

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Bens email address: [email removed], have I referred enough people now? Maybe a shifter is in order? 😜

thanks !!!!

Hi guys! I've been quiet lately... I won't make the plenum like I used to... my problem is paint, it takes me too much time to paint them and in winter the weather is never right. It takes me forever to deliver them painted. So, while I'm working on the new plenum (that won't need paint, if you see what I mean ), I can still make a regular one, but unpainted. The new plenum will be more expensive, so I think I'll still offer the printed ones for those of you who want to save a bit, but it'll be very very nice (well, we'll see when the first prototype gets out!). Thank you guys! Ben

i just stumble into this and do you make this for 997? does it work with all the stock hoses?

Hi! No, not for the 997 yet. I think it has a butterfly in the plenum like the 987, and that's a feature that is difficult to replicate. I'm not sure though, I'll check tomorrow, we have a few at work right now. You can't reuse the intake tube, since the TB is larger. And you have to modify the vent hoses on the 996 and 986. I'll check how it's made on the 997 tomorrow! I hope to have news for the new plenum soon! Ben

ben i sent you email

Happy new year to all of you! How do you guys like that? It's tall and close to the steering wheel, the throw is about as long as stock but stiffer but more precise. It doesn't have the same rifle bolt action as the normal one due to the longer shafts and a bit less stiffness. It feels like a regular short shifter with bushings, but with a stock throw and tall lever (so yeah... not like a regular short shifter) Ben

So I was able to get everything buttoned up and over the holidays did the Softronic tune. Seems to be really peppy now. I had 2 questions: the screw n the bottom of the throttle body drivers side had a support on it. I believe the screw can go theough it. I didn�t do that. Any issues with just having it hang? after the tune I had two times where I engaged the clutch and the car shut off. Is this due to the ecu adapting?

I was not able to get the bolt to go through the little holder, no negative effects that I am aware of. I have not done a tune either so no issues in my end. how much was the tune?

Softronic ran 20% off during the holiday break, it was a little over $700

The holder won't fit with the bigger TB since the bolts aren't is the same location anymore. But it shouldn't be too much of a problem. The plenum is strong enough. There is 90% chance stalling issue is caused by the tune. Give them a call or an e-mail Thanks for the picture

They said it could be because of the GT3 TB: "The idle is around 700 yet I forgot to mention also a TB that is to big for the car can cause it to stall and more so in cooler weather as the car cant adjust the airflow properly. The TB controls the idle as it is only open 2-3 degrees and a too large TB causes it to close down farther as it tries to regulate the air. You can disconnect the battery and reconnect it to force a re learn yet a TB sets itself when you turn on the key and wait 30 seconds." The day I took it out, was probably around 20 degrees F outside

Was it doing it before you flashed the tune? They should have accounted for the bigger TB when they sold you the tune. Did you specified you had a bigger TB? There should be no problem regulating idle with a 83mm on a 3.6L engine. Check also that everything is tight and hooked up.

Hey guys, I cleared all the codes. I was also using an oiled filter from EVOMS so I know switched to a dry filter. Cleaned the MAF and tightened all the screws and clamps. One of the rubber clamps was a little loose so maybe some air was leaking or being sucked in. Needless to say its running very nice for the past week. Will keep you posted. Thanks Ben!!

Hi guys ! Big news today ! You might not know him yet, but I'm proud to announce that Uniwerks has decided to become the official distributor of my Short Shifters in the US! Ordering is now easier and faster, and there will be less chance for the packages from France to get stuck at the customs or lost. Don't worry though, the price is still unbeatable! So, from now on, if you want one, it's that way -----> Uniwerks Design Christopher who created Uniwerks is a Porsche owner too by the way I remain available for any questions ! On my side, I'm still working on the tooling for the new shifter. The first production version will be ready soon! For the plenum, it's been raining almost every weekend here for the past month... and I need to paint the prototype that will be used to create the mold... It's taking longer than planned... but we'll get there! Once done, Uniwerks will most likely distribute the plenums too! Thanks guys! Ben.

Thanks Ben! I am happy to be working with Ben, his shift kits are simply great! I have a 1998 Boxster and will be developing (and distributing) parts for it and select other vehicles. Cheers! Chris

I finally got around to installing my Ben's Plenum and GT3 Throttle body. It wasn't too bad of an install. I have a Fabspeed intake, so I wasn't sure how it would all fit back together, but it all went well. I took it for a quick 20 minute drive and it felt OK. It was raining, so I couldn't really get on it, but the butt dyno said it was a little peppier.

Are the plenums still available? How do I purchase?

bump! ben - any word on the updated 996 plenum for gt3 tb? thanks.

Hi ! Not much... I should be dyno testing the Boxster soon to have solid gain numbers. And I have a quote to have the carbon fiber 996 plenums done. But I�ve just made 200 of these : https://uniwerksdesign.com/product/b...lever-upgrade/ So I�m waiting on getting a little money back to start the 996 plenums ! I�m also working on my 928, with a 3D printed plenum of course https://rennlist.com/forums/928-foru...l#post15918722 Ben.

thanks for the update. still hoping to get my hands on a 996 unit when they become available (or if you decide to make a few of the earlier plastic versions). just got myself a hobbyist version of fusion 360 and going to start working up a few bits and pieces of my own; might have to invest in a printer ...

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3Dhubs.com is a fantastic place to get prints made quickly and at a fair price.

Hi guys ! After a year... I finally have the first Carbon Fiber plenum ofr 996 ready for testing ! Ben

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i will be happy to take it off your hands

WOW, that looks REALLY nice!

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Ben, is this meant to solve a problem with the OEM plenum or be an an aftermarket enhancement to net more performance? Looks interesting and a cool project either way. I do think its interesting to see the possibilities that 3d printing offers but would say a standing pressure test is meaningless for something that lives in an engine compartment. I could have stood on a new oem ims, but they still explode. Thanks for allowing the posting of the dyno that's a good start.

LOL. And he is not that heavy as well. jokes aside, the plenum doesn�t stand any stress that is even close to what the IMS does. In fact, it stands minimal stress, if at all. the printed part is made of the same material as the OEM part, minus the imbedded glass fibers. that�s why Ben made the printed part much thicker, and added the reinforcement ribs. I have it for over 2 years now, and have no issues whatsoever. the only issue I had was during installation, as I think the flange where the TB bolts to should be a 1/4� thicker. that should have pushed the TB to words the air filter, and make the figment of the silicone elbow Better. I ended up using an aluminum elbow with two silicone couplers on both ends. to answer your question, the goal off the plenum is to fit a larger TB, taken from the 997 GT3. I personally feel noticeable increase in torque between 3000-4500 where I spend most of the time. I absolutely love it, and will get the CF version.

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thanks. Temperature is a SOB and so is pressure. I dont know the pressure forces a plenum faces heat is obvious, hence the questions. In the market for a plenum and saw the prices and options and paused, personally I'm an OEM person, which is why I asked what problem it's trying to solve. Still interesting. good to know a Prius can run me over and the plenum will be good though

People should use their heads when bolting up intake parts that were not properly stress tested. You get a piece flake off that doesn't make it through the valves and you'll have an expensive repair in your hands.

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That's a fair point. however, individuals are free to buy any product with zero warranty and assume all the risk. When a seller starts making claims that it's a bulletproof solution is when warranties and insurance discussions become relevant. I've yet to see anyone saying this was a production pice of equipment, and this post is anything more than an innovative project the guy is sharing. Can't say the same for some of the other stuff being peddled here.

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The standing on the part was just and illustration As Meir said, the 3D printed part was made in Nylon, without glass filling which makes it softer when hot. So I had to reinforce it with a lot of additional ribs to make it whistand the changes in pressure inside that make the part slightly flex and fatigue. If you've ever had the origine part in hand removed from a hot engine, you'll be amazed at how flexible it gets ! My part was stiffer in these conditions with the ribs added. Now I moved away from the 3D printed parts in favor of the carbon fiber ones because : -people trust carbon fiber more than 3D printed stuff. -I found a way to drastically reduce the cost of the intricate parts. -I have them made in series now that I have the funds, which lowers the cost of individual parts compared to 3D printed parts that can only be made individually. By the way, the 996 version is a new part, but I have been selling the 986 ones for a while now and the 21st to 30th ones will arrive soon So it's not an untested part that I throw out there. As far as 3D printing intakes goes... my 928 is a good example of what the technology is capable of ! And that's not the final version, just a prototype : https://rennlist.com/forums/928-foru...oration-8.html Ben

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i had it in my car , i only seen gain after putting 750cc injectors changed to full engine management , if anyone think they hook it up and boom 100hp they are dreaming . NA is not turbo .