Installed: EvoMS V-Flow and GIAC 93 Octane ECU Upgrade

I picked this up about a month ago and just got around to installing it the other week. This was my first time really doing anything on the Porsche, but it's amazingly simple. This may have been one of the easiest intake installs I have ever done. It's nice too, cause you can sit on your chair and the engine is at the perfect height. Before: I will say that the EvoMS instructions aren't that great, and you have to go to their website to find them. However, there are barely any parts and it's rather self-explanatory. The EvoMS V-Flow: Airbox removed: Remove the MAF from the stock airbox with the included torx safety driver: Clean Throttle Body: I then did a test fit of the replacement air inlet, and it wouldn't fit. That's when I realized the bracket that they provide is for relocating what appears to be the secondairy air pump: The replacement bracket just adjust the angle a bit and slightly moves it back so that the inlet tub can fit properly: Now you just drop in the air inlet and you're almost done. It takes some twisting and contorting to get the air filt in the air box area, but it will fit. Then just secure it to the throttle body connector pipe and you're golden. One thing I'd like to mention is that the MAF hole in the connector tube is very tight. I was unable to just push the MAF in, as the rubber o-ring just wasn't letting it happen. You don't want to use oil or anything on this, as it can drip onto the sensor, so all I did was take some general purpose cleaner and sprayed it onto a towel, then carefully and gently rubbed a small coating on the o-ring. After that the MAF just popped right in, and the cleaner will just evaporate. All done: As for my impressions - the sound is downright amazing, especially when coupled with the sport exhaust. It's only loud when you get on it, and then it's more throaty than it is loud. It is perfect. One thing I noticed is that the intake does not include an air straightener for the MAF, which is integrated into the factory airbox, so the idle flucuates a little bit. Nothing that you can feel, but you can see the tach needle searching a little bit. Throttle response was increased and it definitely seemed to add a little bit of kick. A week after I installed the intake, I talked with Garret Lim from GIAC and then went ahead and flashed my car. GIAC claims 10-12 hp/tq increase at the wheels, and I beleive it. Throttle response is now instantaneous and the rev limiter was increased to about 7600 RPM. Power deliver is butter smooth and very strong, especially at top end when coupled with the intake and exhaust. I would consider these two modifications "must haves" for anyone that is interested in getting some more power out of their 911. You won't be disappointed. Links: www.giacusa.com www.4induktion.com (flashed my 911, GIAC dealer) www.evoms.com - Anthony

Thanks for the great photos! I will add this to my projects file for sure.

I am also looking at adding the flash to my 99 C2. I am just stumped on which way to go....there are a lot of companies that offer this. Giac claims 15-20hp w/ cold air intake on a 1999 which I have as well as a RSS plenum and sport exhaust Curious what kind of pricing this flash was for you? It looks like 1000 clams is the avg price for most of them... It sounds like you are a happy camper thanks for posting -

Great photos. Your throttle body is super clean... shoulda thrown in a RSS plenum while you were there.

How much was all that stuff if I may presume to respectfully inquire? A 'general' ballpark figure would suffice.

Your a/c pump pulley appears to be slightly 'rusty' - how did you let that happen????

I just finished developing some flashes for my 99C2 a few days ago that work in conjunction with a modified EVO intake. When I started with my engine it was making 245 RWHP on my dynojet as a bone stock 55,000 mile car/ engine. The only mods it had was our spin on filter adaptor and the LN Engineering IMS retrofit bearing. Last Saturday after optimizing the flash, modifying the EVO intake and adding a new under drive pulley I put down 282 RWHP from an otherwise bone stock 3.4 engine... If I have time tomorrow I'll dig up a series of plots depicting the evolution of the engine's performance over a two week period of development.

Jake I'm just finishing up putting together a "996 Spec" for our new POC class. I'll be testing it Friday at Buttonwillow. Two recent 3.4 builds dyno'd at 265 and 258 RWHP with stock air boxes and ECU's, and open exhausts. I would be inerested in hearing more about your flashes and what gas you used. The group is having a meeting at Laguna the following weekend and we're considering flashing options, air boxes, etc....

93 Octane pump gas right out of the local Exxon station... I was stuck at 266 HP for a few days, which is about the max I had seen historically with the 3.4 base engines. The flashes I am developing are a result of direct work with EVOMS. I'll be trying several different flashes at a DE this weekend as I can upload them at the track, right in the hot pit in about 45 seconds start to finish :-)

nice write up and pics... that looks fairly clean - does the "seal" prevent engine air (hot air) from entering the intake?

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Chip was about $1,000 and the intake was roughly $600. - Anthony

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Correct - this seals against the lid and it uses the factory fresh air inlet, so it is pulling "colder" air. That is the reason why I paid the extra money for an Evo intake rather than something like the K&N typhoon. I've had Evo intakes on some of my previous cars and their quality is top notch. - Anthony

doesnt look like a very tough job.. that K&N thing is a joke...they send you a pile of sheet metal and screws and tell you to built your own box OH and destroy the car while yur at it with a drill ?? like there were no extra holes that could have been utilized ?? how the sound? do you have a sound clip

Looks like a clean install; nice work. Any chance you did some stock dyno pulls before the install, and will you be doing post-install pulls?

I like the EVOM air box on my 997S and I'm sure it benefits your motor too. Have you opened up your exhaust? The motor needs to both inhale and exhale freely to maximize it's potential.... Jake keep me in the loop for my meting the following weekend. I'd like to be able to present you results preferably with graphics and a cost....

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Nope, no sound clip. I will see about taking one with my blackberry.

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Sorry, no before pulls. I need to get this dyno'd: So perhaps I will arrange for a time to get both of them done.

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Those are bigger than some chipped 3.6 numbers, very interested to see the evolution!

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yippy

Anthony, thanks for sharing. You have dicovered the same thing that I did. The addition of the EVO CAI and a sport exhaust transforms the character of our cars. I have done every N/A mod possible on my 996 (except for some of Jake's newest additions) and I am very pleased with the results. This is my second 996 that I have had these mods installed on. I bought most of my mods used, for about 50% of their new price. I have always thought that the performance gains were significant, but I was unwilling to pay for before and after dyno runs to prove the gains...they made me happy. Jake thanks for sharing your dyno results. It is nice to see someone that is applying traditional hot rodding techniques to our engines, to improve on what Porsche made. I never bought the common belief that the same N/A performance modifications that work on everything from Mustangs to Ferraris, won't produce significant results on our cars. Please keep up the good work. I plan on keeping mine for a long time.

Yea Mfletch....until your next project car is finished!!

Additional note... I would be very careful running your motor up to it's new limit of 7600 with stock internals especially in 4th or 5th gear. Your torque curve drops off around 7,000 anyway, so why stress out the internals....

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If I'm hitting the rev limiter (which may be 7,400 RPM actually) in 4th or 5th gear, I'll be losing my license, so it won't matter if my engine is in pieces.

I had all of your mods but it was the headers that was the bottle neck. After the headers went it, the car came alive and I would do that all over again without hesitation.

Hey Steve. Ouch....you know me too well.

I made my power with a bone stock 3.4 exhaust system. Time and time again the stock system proves to be exceptionally effective at making power.

I have your mods on my 3.4 2000 996 plus the RSS Plenum and it makes a difference...The sound of the Evo intake and PSE excites the senses and greatly increases the driving experience....Next I want to add a supercharger but am waiting to see what happens with the economy.....

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Modifying the Evo intake? What did you do to it? Also, when you guys post your dyno numbers are they SAE or raw numbers?

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thx!!! Was it a noticeable sop improvement??? Anybody ever done just the chip mod? Is it sop-noticeable by itself???

i have looked under my trunk lid to see where the opening to draw air in is for this system. (above the air filter) i see there is a seal around the top of the filter box to seal aginst the trunk lid? but why does it do this?

I would check your seals between throttle body and air flow tube. I've got the same CAI and never get 'searching', maybe a small air leak. A build up of carbon deposite in the butterfly flap could also cause this, get some carb cleaner in there... Good choice on the CAI though, bit of a pain to change over cone filters but otherwise great product, oh and watch the EVOMS name plate, the screws holding it on have been know to come loose, I took mine off after one screw went 'missing'...

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It's to keep the hot air from the engine from getting into where the filter draws its air from.

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It's very minimal searching, and I am positive it's from not having a "straightener" for the air before the MAF sensor. I have been driving it more and it may not be doing it anymore, I'd have to check. Perhaps it was also just the ECU calibrating the idle to the new amount of airflow.

Then why doesn't the unit come with a cover to completely close off where the filter is so that air can only come in through the snorkel? Pete

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Probably because it's a lot cheaper to just put some molding around the top of the box and let it seal against the hood rather than creating a removeable top.

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...maybe you could fab one if desired?

I have also wondered why the filter seals against lid rather than a cover. I can't believe it is just cost (which could just be passed along to us P-car owners anyway). It would be interesting to know why it was designed like this. Perhaps just to make us check the filter every time we check the oil?

ohhhhhhhh its to REPLACE the filter??? me thinks? I thought it had something to do with another inlet for airflow to the filter. which is why i looked for a air channel in the lid. maybe one of the ballers with a GT3 (or racing) lid can tell us if there is a hole in the right side, over the cone filter?

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Corrected to SAE, gathered on my dynojet. The engine was tracked all weekend, flawless and very fast! More later..