93 BHP Upgrade for 951 £600 Anyone? - Page 1 - Porsche General - PistonHeads UK

Barry, Have you sold the Kit yet?. What car was the kit on, 220 or 250, did you have the car dyno/rolling road tested to determine the +93 figure. Pete (looking more power)

87 951 > 220 bhp

Yes Thom, you're right, 87 951, 217bhp. If it's more, safe, cheap power you're looking for then this is unbeatable. Basically, the standard Airflow Meter, is a barn door type, which opens due to the vacuum created before the turbo. The new unit is a mass air flow type, which uses a wire, similar to a light bulb element (no restriction caused by a huge great flap in the intake feed) which is heated. The air passing over the wire cools it and the ECU can interpret this to to determine how much air is being taken in and can therefore adjust the fuelling accordingly. This is the system that is used on all modern porches now. Allied to this is a new chip. The standard chip from the factory was set for 93 octane fuel, in this country, regular unleaded is around 95 and Optimax 98 guaranteed, so the new chip allows for this higher spec fuel. It also raises the boost level slightly (to around 17psi I think) and there you have a 90+ bhp increase in power. It totally transforms the car, believe me, anyone making this change will not be dissapointed, I couldn't believe that after tinkering under the bonnet for 2 hrs and the changing the chip (all very easy I can assure you) would make such a huge change. As as we all know, these engines are so overengineered they can take it. My car had 130k miles on it when I put this on and I had no problems whatsoever. I didn't dyno the mod, but the factory claim 93 BHP, and I have absolutly no reason to doubt them at all, it feels every last horse of 93 believe me!

Yes Thom, you're right, 87 951, 217bhp. If it's more, safe, cheap power you're looking for then this is unbeatable. Basically, the standard Airflow Meter, is a barn door type, which opens due to the vacuum created before the turbo. The new unit is a mass air flow type, which uses a wire, similar to a light bulb element (no restriction caused by a huge great flap in the intake feed) which is heated. The air passing over the wire cools it and the ECU can interpret this to to determine how much air is being taken in and can therefore adjust the fuelling accordingly. This is the system that is used on all modern porches now. Allied to this is a new chip. The standard chip from the factory was set for 93 octane fuel, in this country, regular unleaded is around 95 and Optimax 98 guaranteed, so the new chip allows for this higher spec fuel. It also raises the boost level slightly (to around 17psi I think) and there you have a 90+ bhp increase in power. It totally transforms the car, believe me, anyone making this change will not be dissapointed, I couldn't believe that after tinkering under the bonnet for 2 hrs and the changing the chip (all very easy I can assure you) would make such a huge change. As as we all know, these engines are so overengineered they can take it. My car had 130k miles on it when I put this on and I had no problems whatsoever.

Porsches since the 993 use hot film, not hot wire, systems AFAIK. The principle is the same though, just hot film is meant to be a bit more accurate and quicker responding. Geoff Everett at AMD harps on about it, but some people remain unconvinced about the gains - spoke to Colin at 930 the other day (top bloke!) and he isn't so sure that it adds a lot.

doomster, before I sold the car, I would have been more than happy to take you for a spin to demonstrate. Trust me, this conversion worked, nuff said.

Baz - I'm sure your conversion worked a treat - I had a 944 turbo with 220 and got it up to 153 mph easily enough on the M40 - 300 bhp would be special. It's just that you don't find hot wire on modern porsches these days and you said (with reference to hot wire): "This is the system that is used on all modern porches now." But Colin Belton likes the older style hot wire system like your conversion used, and that's good enough for me! >> Edited by domster on Friday 5th July 14:18

Going by experiences on Rennlist, it's the extra boost that gives the power increase, with the MAF doing more for throttle response. Plenty of people on there seem more than happy with the Autothority set up.

That sponds about right Basil

Sorry but a maf and chips is NOT going to give you any where 93 bhp Chips do virtually nothing to alter boost A MAF might give you 15-20 bhp

So perhaps it was the jet in the banjo bolt in the intercooler tube that altered the boost. If anyone continues to doubt my claims, why dont you put your money where your mouth is and borrow and test the kit for yourself. You will be suprised I assure you! If you dont borrow and test it, stop insulting my intellegence with these disrespectful posts. I want to sell this kit to someone looking to increase the performance of these brilliant cars, and having road tested it for nealry a year, I can recommend it. If I people are not understanding how I am describing the kit, can I point you to the web link in my first post on this subject.

Bazza is correct. The jetted banjo bolt raises the boost and the chips provide the correct fuel curve for the revised boost levels. As in my previous post, there are plenty of people on Rennlist who can testify to the Autothority upgrade. Dmsims - you have a dyno plot on your website of a 'chipped' 951 showing 301 BHP. Why do you say the APE kit wouldn't give these kind of increases? >> Edited by Basil Brush on Monday 8th July 15:52

Thw seller made a completely false statement This has now been clarified to my satisfaction

Thanks Basil So now that has all been cleard up, Does anyone want to buy it?

So glad you're satisfied DMSIMMS, did you read the link I first posted? somehow I think not because you seem to know it all already. I was trying to give a brief descrption of what I am trying to sell, and as I am not an expert (unlike you, clearly) I attached the link to the manufacturer so interested people could look up the full facts before deciding if they were interested. I've read a few of your posts on other topics, and you really are arrogant. It is people like you who make the general public think that all Porsche owners are w$%kers. Try a little more humility.

C'mon baz, no need for that. Dmsims may have a 'concise' prose style, but regular posters know that behind his brusque contributions lies some extremely valuable technical expertise. He is one of the real techies on this forum, and can therefore make more valuable contributions than well-meaning amateurs like me.

Hi again, I'm not attempting to defend anyone. But, the reason that I asked the original question is because there has been a considerable ammount of 'chat' on a different forum about the next stages in the search for power on 944 turbo's. Dave Simms, who is also a valued member on the said forum, has vast ammounts of expertise and experience on 944 turbos. The overiding factor that I, and others, follow on power increase is: Without a rolling road/dyno graph of your own cars before and after figures, how can you possible tell the ammount of increase in power. Now don't take this the wrong way, I'm not disputing the +93BHP figure, I was only asking where that figure came from. My own car, when put on a dyno, gave a BHP of 226 at a relitively high humdity figure. After wastgate refubishment, and chipped, the figure came out at 265 BHP, and 313 Lb Ft torque, on the same day. By adding a Boost Enhancer, the power is usable throught the rev range. The next step that many owners are taking, is to remove the single port wastegate, and fit a dual port wastegate. Then retune the chips. Of the owners that have been down this route, the dyno graph figures on their actual cars, range from 280 BHP to 320 BHP. One owner went along the route of Mass Airflow, Dual Port Wastegate, rebuilt head, retuned chips, etc. This car was worked on by a Porsche racing expert a 10 min walk from my house. So, I often popped in to check on progress. On the rolling road/dyno, the car spun the rear wheels at 5000 revs in any gear. No one that I know of, apart from this thread, has fitted the Autothority chip. I hear that these chips may, I repeat 'may' be programmed to run lean at the top end. Believe me, if this is true, you don't want to run a lean set-up on a rechipped 944 turbo. Hope this had shed some light on this thread. I talked to Dave Sims at Brands Hatch trackday on Monday 8th July, and we will both be at the Silverstone trackday on Friday 11th July. So will another 5 944 turbos, most of them enhanced on some way. I'm still interested in the mass airflow, but, having warped a disk at Brands, and variuos other demands on my cash at present, I will have to let some other person have it cheap. See you all Pete >> Edited by Pete Cros on Thursday 11th July 08:09 >> Edited by Pete Cros on Thursday 11th July 08:12 >> Edited by Pete Cros on Thursday 11th July 10:53

Hey All I have a Windward Performance Mass Air Flow meter and chip upgrade for a 951, which I have run on my car for 10 months. Absolutely fantastic and the best £1200 I ever spent on a car! Now that I've sold the car, I have the hard and software for sale. If anyone's interested or wants to know more drop me a line at my e-mail address on my profile. I would also recomend checking out Windward Performance webstite, link attached. www.windward-perf.com/massflow.html