We can expect what on a stock 997.1 c2s ? 295whp average ?

I know the results may vary (and sometimes a lot...) but what can i expect, in a realistic way, from the following modifications regarding wheel horsepower:

- Fabspeed muffler bypass

- intake + filter

- Softronic ECU flash optimized for oct94

?

 

Maybe 10-20 hp max for all items combined!

 

Between 6 speed & rennlist 997 forums there are hundreds (thousands) of posts about these topics. Do some searching.

 

23.756 hp to 27.887 hp gain would be reasonable. But, I'm just guessing.

 

10hp peak if your are lucky. However the car will sound much better.

I had a stock 2007 Carrera S with Fabspeed mufflers...that is it...to make things even worse I had a 5 speed Tiptronic transmission. I tracked the daylights out of that car too and I ran with a guy that had a 05 Carrera S 6 speed...so closer ratio gearing, Fabspeed headers, 200cel cats, Fabspeed mufflers, Evo Intake ect. On the long straights he was not pulling away from me.....possibly just a tad but it all depended on each of our exit speeds coming out of a turn.
For the thousands of dollars you will spend on headers, cats, mufflers, intake and a ECu flash you are not going to feel a day and night improvement.

 

If you're after hp I think the biggest bargain going is the TPC Single Turbo kit. I agree that you'll be lucky to net 10hp with the additions you listed and wouldn't be surprised if you gained nothing or even lost a little.

 

that is the reason right there! I will constantly gain and pass higher powered Porsche TT's by exiting the corners faster. Spend your money on Suspension and driver training (not needed by you Mike)

 

Oh yes it is...just got back from the Porsche Master class....next goal is to get more private instruction at the track....I'm always learning...driving style and the car.

I can sum up driving to be in a lot of ways like being a musician.

 

If you are thinking of what to do after playing with all that stuff myself I think best combo is to put BMC oiled filter panel into stock airbox, then put cheapest 200cell cats on instead of stock ones - Fabspeed, AWE, does not matter which brand really, whatever you find for reasonable money, then after that do Softronic flash.

That stuff will add about 25 horses or so if you`re lucky but most importantly id not just power add but it will make torque much more linear in higher revs section and car will pull more equally from 4.5K rpm to very top plus you get redline pushed up to 7500. It helps. How dyno graphs look before and after those mods - click at car in my garage link and you`ll see. Ignore actual numbers on those graphs as it is debatable but check out how shape got changed. That is what matters most.

Do not forget to buy $5 MAF sensor cleaning spray in Autozone and soak your MAF sensor in it properly - spray whole bottle on it from all angles. Get throttle body cleaned up from dirt and old oil. Spark plugs are not required unless dyno run will show you weird timing fluctuations.

Keep all the rest stock in engine bay.

Then get 996 GT3 LCAs installed and if you do not afraid to start leaving parts of you car on each speedbump - get coilovers like PSS10 or KW3.

 

from my searching and extensive reading on the forums, I would agree the things to do are 200 cell CATs and ECU. All of the mods are heavily debated, but the people I trust seem to agree on these two items (although not who should do the ECU). After spending thousands on parts, you may expect adds the mid 20s HP, so you won't feel it really. Most of the people here do it because they enjoy it and they like to change the way the car sounds.

 

I did searching.

The lack of consensus found among the tons of posts is amazing.

There is debates about the best mods
There is debates about which model/brand is better in the best mods
There is debates about the dyno's accuracy
There is debate about which mods gives the best (subjective) feeling (sound, low-mid rpm power v.s. hi-rpm, driveability, etc..)
There is debate about inflated results for commercial sake
and so on...

i try to do my best

 

honestly, I'm a skeptical guy too. If you want a real change (something you can feel), then you'll have to add a turbo or supercharger. These other bolt on mods aren't noticeable to your butt dyno and will costs thousands. I would only do the changes if you like to tinker and want to change the car's exhaust sound.

 

You've read well, Michael, and listened to the right people.
I did just about every non-forced-induction mod possible on my 997S, spending thousands. If I had to start over again, I'd immediately do the Gundo Hack cans, AWE cats, ECU, and a Supercharger. Period. Beyond that, a LWFW and a SSK.

If you're not willing to go for REAL power, like you'd get with an SC or a Turbo, then you can dicker about with this and that, and enjoy the process, but not really change much. That said, it's certainly worth doing cats and ECU. Mufflers and cats change the sound, which can improve your enjoyment, so that can be worthwhile. I thought the plenum was a good mod, and the EVOMS CAI a good one, too.

The only real way to change the car is to add forced induction via a supercharger or a turbo. I went with a modified VF-Engineering Supercharger, and went from 355 HP to 530 HP. That's a gain of 175 HP that's real and measurable, and verified. You ain't gonna' touch that kind of power increase with the easy stuff.
CATTMAN

 

There is still a buzz in my head that keeps repeating - those engines were not designed to handle such load. Crankshaft is not forged, valvetrain can fell apart, pistons can crack... Again, it is a difficult stuff to estimate. It may break, or it may never break. On other side of things - even on non-FI cars cylinders can crack like shown on some recent rennlist posting, if you saw it.

Still, pushing stock engine into 500hp at crank territory is quite risky. Right now I do not afraid to hit accelerator and redline car when I see fit, if I get that turbo on it I will probably keep thinking - will it blow or will it not blow every time I drive and it may kill all the fun. It`s tempting nevertheless, but I think it probably would worth to find good tuning shop first to balance crankshaft properly and check if they can do any alterations to engine head to make it suitable for this power increase.
I also exchanged a dozen of emails with VF-E supercharger makers, they have advised not to go over 400hp area at all, I asked them about smaller pulley and stuff and they were firm on their position that increase of pressure from going lower than pulley they supply is not advisable - they claim lubrication issues and overall danger, bla-bla-bla. So all this FI business is not as simple as it seems to be at a first glance.

 

Well stated. And if you want that kind of power (500+hp) then starting with the TT would be the logical first step..