Hello,

I have a basic question regarding torque and hp with respect to modding my GTP. I have modded my vehicle and I am happy with the performance. I like the amount of torque my vehicle has, and in fact, I would love to increase the low end torque that I currently have to get an increased “pushed in the seat” feeling. As many of you know, I am considering headers, which will help net another 10 -15 hp, but I have read that I could lose some torque. Can you all explain how one would gain more torque and would adding headers reduce my current torque? I appreciate your assistance.

Thanks.

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2009 G8 GT -Sport and Premium Pkgs, Roto-Fab CAI, Cortex 93 Octane Tune, Billet Prototype Catch Can, BMR Front and Rear Sways, BMR RTAs, BMR Rear Cradle Bushings, BMR Steering Rack Bushing, GXP SW......and much more to come.

the short take is. the headers will drop your torque a little but you will be able to do other mods that will bring hp and toruqe back up..

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2001 white gt coupe with enough crap to make it run mid 13's with 3 bad pistons
2002 40th GTP sedan mostly stock

You lose the low end torque because there is less backpressure in the exhaust with headers. But, like bigdog said, once you open up the exhaust, you'll open up the doors for other mods that will bring the horsepower and torque numbers up even further.

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One Big Ass Mistake America

Thanks -
So what mods would be necessary to bring back the torque after headers and even provide more torque?

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2009 G8 GT -Sport and Premium Pkgs, Roto-Fab CAI, Cortex 93 Octane Tune, Billet Prototype Catch Can, BMR Front and Rear Sways, BMR RTAs, BMR Rear Cradle Bushings, BMR Steering Rack Bushing, GXP SW......and much more to come.

3.5 or 3.4 depending on Knock.

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04 GTT - Retired
Best ET 13.016
Best Trap 115.56 MPH

[quote="VictorSmalls
3.5 or 3.4 depending on Knock.[/quote]


That is it?? wow..I was thinking I would have to get rockers and a cam.

I can handle dropping from a 3.6 to 3.5 or 3.4 and get more torque than I do today.

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2009 G8 GT -Sport and Premium Pkgs, Roto-Fab CAI, Cortex 93 Octane Tune, Billet Prototype Catch Can, BMR Front and Rear Sways, BMR RTAs, BMR Rear Cradle Bushings, BMR Steering Rack Bushing, GXP SW......and much more to come.

hmmm...im pretty sure ive read that you should only do rockers or a cam...correct me if im wrong...and to go to a 3.4 i think you may need some more mods than what you have but im not sure...im a lowly N/A at the moment so the more experienced guys can jump in, im only going on what im pretty sure ive read...

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04 GP GT1 black spo grilles/spoiler, tinted led tails/third brake light, painted reverse bar, 6k lows/fogs, gxp door rings, STB's/DR brackets, DR door locks, GMPP RTA's, Wizair

Depending on your knock seed you should be able to stay with a 3.6 pulley and not really lose too much torque with headers. When I put headers on and went driving with 3.8" stock on I noticed torque loss, but that was replaced when I dropped to a 3.6". Depending on knock your getting you may be able to even go farther from there with a 3.5. I'm thinking you would start seeing knock after a 3.5..... As this would be similar to running a 3.25, 3.3 on a 97-03 and you may need intercooler,cam, etc to be able to run knock free.

Best of luck, it really depends what knock you are seeing and what your tune is like.

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A 3.6 with bumped up timing would be a good place to start, after a tune (which is when timing would be changed anyhow). Once you're there you can decide if you're happy with the car. Then in a few months when you're bored with it again, we can lead to towards the next mod. Or if you want to skip all that, just go turbo

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'05 WRX STi - COBB Stage 2|Invidia DP|3" Borla XR-1|Coilovers|Camber Plates|Swaybars|Endlinks|Bushings|Braces|Anti Lift Kit|DBA4000s|SS lines|
Sold: 06 Cobalt SS/SC, 99 GTP 245WHP/326 Ft-lbs, 06 R6