GBG
what are you going to do exactly ?
every tuner has a "600hp" kit

tuner a can have their 600hp kit dyno 480rwhp, tuner b can have theirs make 550rwhp

for example, illm3 (ruf gt2), the car is claimed to be the "590" kit, and that thing is quick as hell

same thing with RCNJ's gt2
there was a guy who claimed to have an "800hp kit" by a tuner on here, and my car was faster than his

 

also, do you plan on leaving the car AWD ?
i belive once you cross the 600 lb/ft of torque line, your center dif starts slipping, making the awd useless, and it costs you drag efficiency

 

btw, i think UMW advertises my software upgrade as 575 hp ??

meanwhile, i can pull on a evo 600 without any problems

what size tires are you running ? you'll need something sticky to hook up in the lower gears
my tires are shot (my rear left tire is on the metal bead on one side due to camber wear) and i get sideways in 3rd gear

p.s. i would also suggest you upgrade your brake pads, upgrade to stainless steel lines, and put castrol racing brake fluid in your car (vivid racing sells em)

you need to balance the rest of the car to be able to cope with the power, to give you more confidence ...

 

Steve,

I haven't decided exactly what I plan to do, but at the moment I'm planning to do upgraded turbos (garret hybrids), headers, exhaust, boost hoses, fuel pressure regulator, and programming, and most likely also upgrade the intercoolers and clutch.

GBG

 

GBG
speak to lenny spoolin
he also has a convertible TT
i believe had gt28s installed on his car.... from what i remember , he was making 661rwhp

keep in mind a convertible is heavier than the sedan, so you would have to neutralize the weight disadvantage by adding more power

 

That first post by Steve was amazing! I love it....

Yeah these cars are really strong. I have not heard about any big or major issues happening with them and I know a lot of guys that beat and push them really hard!

 

thanks man

these cars are built so well, that it would be a disservice to not beat on them

i cringe when i see 5 year old turbo's with 5000 miles on them ... lol

 

Thanks Steve!

 

no sweat
btw , i would love to check out your car one day

i dont like convertible cars, with the exception of the porsche 911
i think its the sexiest convertible because of the wide *** , and i would most definately trade my car for one

 

Thanks Steve. I'll post a few pics soon, but maybe one day you will take a drive up to the "country".

 

Before you decide there are zero long term reliability issues, from an engineering perspective if you increase the stresses you increase likelihood of failure.

There is little data (other than the posts you get once in a while) that would speak to your question- LONG TERM reliability. 50 people can post "I've got big turbos and no issues" and that still isn't 'data'.

now, if you question was 'should I mod, is the slight risk worth the reward?' my answer is yes- but you asked if increasing output reduces long term reliability. The answer is: we don't really know- there is no hard data, and theoretically you should see a higher failure rate over many samples.

my 2 cents

A

 

Proto 700 on the way. I've worked with several tuners and have found Todd to be one of the best in terms of knowledge, skill, and experience. Best of luck in your quest for more power!

 

This engine is the same engine as the GT1 used isn't it? Porsche has a race history on this engine, and I imagine enough data could be found to get an idea of the engines reliability at a particular power level. I agree about the decreased reliability with mods, but this engine is under tuned(turbos aside) out of the box. The fact that porsche races what they put in their production cars(for the most part anyways) at much higher HP/TQ levels must say something for their capability. I bet the difference in reliability from stock to 600hp is much less and possibly not even noticeable than most other cars that are modded. I own a stage 3 B5 S4 and the engine itself is bulletproof, but the sensors are another story. I daily drive mine and never have mechanical issues due to the stout block and piston design. The sensors are the weak links on this car due to the excessive heat under the hood. Being modified doesn't really effect that though. I imagine a properly tuned and maintained 600hp 996tt engine will last far longer than the electronics and sensors that support it.

 

GBG, if I were you, I'd give Kevin a call over at UMW and talk to him for 20 minutes.

 

I've talked to a few tuners and they all (predictably) say that a 600 hp upgrade will have no long term impact on the motor. Of course, it depends on how one defines "long term". (If long term mens a few years and/or 30,000-40,000 miles, then they and this Board has plenty of data points; if long terms means 10 years and 100,000 miles, then they probably do not). I am more interested in the 30-50,000 mile answer, but would of course like to hear whatever people have to offer.

These posts have been very helpful. Thanks.