I have a 97 GTP and im about to start adding major mods.. So, my question before I start is, is 400HP to the wheels on a L67 realistic? I know its not gonna be cheap, but I wasnt sure what most people get out of these motors after they have put some money in them.. Thanks!

Turbo it and yes it's possible. Expensive (cheaper than staying S/Ced) and the trans will blow up in due time, but it is possible. Getting that sort of power with the M90 though is going to be harder and more expensive (the M90, especially your Gen III M90 is great at making a lot of heat and not a lot of boost. The GenV's are better) and after everything is said and done, hitting the 400 mark is still going to be a long shot. If you wanted to stick with the blower route, look into e85 conversions or even a Whipple S/C. There are a few 400HP M90 blown 3800's though so it is possible just super expensive, crazy builds which result in a car that is a pain to DD, obviously built transmissions, and nitrous might have been involved
You can still make the GTP have lots of power (torque mostly. 3800's aren't exactly known for HP since they can't spin to 9 grand and S/Cs aren't designed for peak HP in mind, they are meant more for torque down lower in the power band) within a more reasonable budget and it will still be a fast enough car to have fun with at the track.

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

Alright cool. I do not plan on turboing this car at all. What is the difficulty of swapping the gen v for the gen lll?? Also what benefits will I see?? I dont wanna put thousands into this car to not get what I want out of it. But thanks for that information that helped a lot!

I typed out a whole long explanation and then I found this, which sums it all up much better than I could.
http://www.grandprixforums.net/eaton-ge ... 49039.html

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

Your better off calling it a day at 300 whp or close to it. The tranny lacks strength to hold down the power. If there were GM racing chains, I'd still be in a GP only with a turbo or in the process.

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Why have more money than brains? Cuz RACE CAR :

one of the local guys i know is putting 585 to the wheels, so yah it can be done. but doing it with a blower is gonna be rough. turbo is the cheaper way to do it for sure, if not the low to mid 300 range is very doable but will still cost eniough.


a question that i feel needs asking though is are you just looking to have a high number hp motor just to have or are you looking for track times? what is gonna be the goal of the power?

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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

400WHP on a m90'ed L67 is not reasonable. Yes it's possible, but there's 100 better ways to spend the money. Most of them being LSx powered.

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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

Besides the aftermarket for the GP is mostly limited to ZZP and a few others.

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Why have more money than brains? Cuz RACE CAR :

400whp is not realistic with the M90. It could, but won't be fun to drive it on the street.
300-350whp is more ball park for a streetable M90 setup.
With an XP cam, 3.0" pulley, E85 and I/C, I'm around ~340whp

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'04 GP CompG - 2.6" junk

All good posts so far. The only thing I don't like about this whole thread is a goal of a peak number. You can get a 4 banger to hit 400 HP and still run 14's cause it has no "real power". A number is just that, a number, bragging rights or not. A 3800 putting down a stupid flat torque curve of 350+ lb-ft but only making 300 HP will be faster than 400+HP cars on the road. This brings me to HP. It's also just a number, literally. It's a mathematical equation it's not something tangible. HP = (Torque/(ftxlbf) x rpm)/5252. This is why high revving engines making so much HP yet little torque. So what I'm trying to get at, is goals are great, but a 3 digit HP number shouldn't be the be all end all target because something can be crazy fast and not make huge HP numbers. Torque is what it's all about.

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

HP sells cars, Torque wins races.

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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

I <3 torque.

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'04 GP CompG - 2.6" junk

lol I understand its just a number. And thats exactly what I want. I want my car to Dyno as high as I can get it. But thanks for all the input. Im slowly learning more about these motors and such. But anywho, what exactly were you talking Kyle when you said LSx powered??

LS(insert number here) is the many variants of GM's V8 engine (think Corvette engine). The LS4 came in the GP GXP's and 06+ Impala/Monte Carlo SS's.
So since you just want to attain a crazy high number, do you intend in DDing the car in any reliable way, tracking it, what? Or it is just going to be a dyno queen?

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

as said before

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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

lol i dont want a crazy high number. i wanted 400HP. with the mods andrew has and he has 340 thats great. I could do those same mods, add rocker arms and put a 50 shot or so to it. Then im done with performance.

400WHP could be considered a pretty crazy high number for a 3800 though, and it's a deadly amount for the 4T65 We're just trying to ensure that you don't dump a ton of money into something that is perhaps your only form of transportation just to attain bragging rights. Also, if it's a typical older GP that lives in the northern part of the country, it's probably has cancer all over the bottom and strut towers and if that's the case then dumping tons of money into it probably isn't a wise idea.

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

Nahh im only the 3rd owner ever and the 2nd owner was a mechanic who took very good care of it. But anyways, if I plan on doing typical mods as andrew what cam would you all suggest?? Also, when I intercool im going with the nicest one on ZZP, should I intercool first, or new cam and rockers?

Turbo?

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

Buy something with a V8.. Haha Starting off big is always good.

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2009 Pontiac G8 GT- Roto-Fab Intake, Roto-Fab Radiator cover, Superchips Cortex Tune, Tinted Tail lights, Corsa Cat-Back Exhaust, Tinted side markers, Painted GXP Diffuser, Tinted Reflectors, Painted Grilles.

Starting off powering the rear wheels or all of them is even better

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

In your opinion. You can have the AWD.

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2009 Pontiac G8 GT- Roto-Fab Intake, Roto-Fab Radiator cover, Superchips Cortex Tune, Tinted Tail lights, Corsa Cat-Back Exhaust, Tinted side markers, Painted GXP Diffuser, Tinted Reflectors, Painted Grilles.

I have a 406 SBC slowly being put together. Im not worried about getting crazy HP, just everything I can out of my car without getting too radical or pricey. Im not swapping anything, im not going bigger, I came here for advice on this motor and this car.

A 400whp M90 build is both pretty radical and pricey....
Just saying.
If you aiming for something like Andy's 340ishwhp than go look at what he has. A GenV and e85 plus all the other supporting goodies, so if you want to run something similar to his build, you'll have to at least swap the blowers and tweak the fuel system (injectors, tune, etc).

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

:creep: did someone say torque?

i vote, since you have money to kill, turbo it and figure out a way to put a 6 speed in it =P I've seen people attempt it and fall short.... maybe you could succeed!

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Gt2256v, FMIC, Port & Polish Head, Stage 2 Colt Cam. Rosten Rods, PD150 Pistons, Oil Cooler, Fuel Cooler, Diablo W/M kit, Built 5 speed with LSD
I work on enough GP's to know I don't want to own one =P