Red2.4SS/SC

gto makes 330 whp

to 340 350 is pushing it big time thats like saying a stock cobalt dynos 225

and your also failing to add in the cat back and intake so 250 whp maybe even 255

Scythe_Snake

The 6.0 LS2 is supposed to make 400hp & 400 lb-ft of torque.

8cd03gro

which would make 340-350 right on par to the wheels. I dono though, never seen a gto dyno...ls2 might be under rated. anyone know where some stock gto dynos can be found?

Scythe_Snake

I don't think it would have that much of a loss would it? I'd guess perhaps....360-370ish stock.

8cd03gro

whoa now....generally a manual tranny has around 12-15% loss leaning more toward 15.

400X0.15 = 60
400-60=340...

even if it only has 12% loss it is still around 350... the autos will be lower too.

again that is if the ls2 is accurately rated, which it seems it is....

laserelectric

Alright...So since NO ONE except the guy who made this thread seemed to know what they were talking about, here is what I pulled off the PONTIAC page itself. The stock GTO with 6.0L runs with 400 hp and 400 lbft torque...While the 5.7 L is only 350 hp and 365 lbft torque. Nuff said. Depending on whether or not he is in the 5.7, or th 6.0, that dude may have put a LOT horses over him. So, the weight to horse power ratio SHOULD almost balance out. It seems like it might be close, but I don't think it would be side by side. Mayb 2 cars + ahead for the GOAT? I don't know, you can check it, but these are numbers I got from A. pontiac.com, and B. random other car sources.

Pontiac.com - Raise the bar once and there's no reason not to do it again. A new six liter, all-aluminum 400 hp LS2 powerplant makes for a good start. Add more torque, a beefed up drivetrain, bigger brakes and meaner look and we didn't just elevate the bar, we took it to a whole new level.

Horsepower 400 hp
Seating 4
MPG††† 16/21
Engine: 400 hp, 400lb-ft torque, 6.0L Gen IV LS2 V8
Technology: Rear-wheel drive and independent rear suspension
Transmission: 4L65-E 4-speed automatic transmission (Available manual)
Sound: 200 watt Blaupunkt Surround Sound entertainment system

8cd03gro

we are talking about wheel horsepower....maybe it's you that doesn't know what you are talking about?

StinkBOMB

laserelectric

Ouch...Ok, touche...So you do have a point. I figured I was going to get the whole talk about "at wheel hp", but I wasn't sure if that was what the factory was referring to or not? Well, anywho, I never claimed to be a genius, and PROBABLY shouldn't have said you guys don't know what you are talking about. EVEN if you are referring to "at wheel" horse power, I still think that the GTO should have a pretty good jump on him. Not much, accounting for weight and all, but at least a car or two...So yeah, I just put those specs up to try to give you guys something to base you estimates on, no need to get too angry. Nice poster above by the way...I shall take my bitch slap with dignity.

dee99gt

I've only ever raced one 06 GTO at the track. I had my 03 Cobra then. He had a full exhaust and cam. He ran the best of a 12.7. He got me out of the hole but I ran him down and ran a 12.0. I wasn't impressed esp for a cammed LS. The 5.7s all i ever seen them run was mid to high 13s at the track.

8cd03gro

lol just don't go saying people dont know what they are talking about then post info that all of us could probably recite from memory. i know the gto should have a jump on the ss, i was just stating the facts. plus it wasnt me that said you got stalowned LOL!

what in gods name did you do with that cobra??

dee99gt

catback, ported blower and some dr's.. I wasn't pleased with the 12.0.. I had a lot (!) of traction issues.. Plus the IRS sucks in those cars so launching them out of the hole wasn't fun..

http://s19.photobucket.com/albums/b2...t=CobraRun.flv

8cd03gro

no i was asking why you got rid of it?! shoulda spent 1k on a pulley swap, a tune, and maybe a few other little things and run mid 11's or faster on street tires!

04YellowGT

You ported your blower but never did a upper and lower pulley swap? By just doing that and an intake you would have been a mid 11 car. Invest a few grand into the IRS and youd been good with traction and wheel hop too.

dee99gt

well.. when I got my butt kicked by a cammed and tuned plus other bolt on LS1s.. I decided to go with one.. lol plus a lot cheaper insurance and payment wise by far.. The 03 dynoed 463.. Stock wise it was a strong running car.. Somewhere between my ported blower install and tune I think something happened because we had a horrid time with it, they thought for awhile it had some head damage.. it took hours to tune it and we had to change the spark plugs.. water would gush out the exhaust.. coolant was going everywhere.. haha.. but i miss it.. was a nice car.. cobra - 22K camaro - 8K insurance cobra - 3K a year camaro 1K a year

celicacobalt

well on dragtimes.com i saw a ls2 gto dyno at 336 whp

607Motorsports

I've also seen comparable numbers to these. Driveline loss in a RWD car is quite large even with a manual. In an auto RWD car it's disgusting how much hp you lose from the crank to the wheels

codyss

2004 GTO / LS1 will typically dyno around 295whp with the T-56 and around 280whp with the 4L60E.

2005/2006 GTO / LS2 will typicaly dyno around 355whp with the T-56 and 345whp with the 4L65E.

90% of the low dyno numbers in LS2 cars was due to heatsoak of the IAT. The car uses a modular MAF/IAT combination, if you let it sit running the sensor heats up. Thus showing higher than normal air temp leading to less power. Anyone who sits in line forever at the track with there GTO running will be rewarded with less power and high ET's.

A well driven 2004 will easily see mid 13's around 104mph, and a well driven 2005/2006 will see 13.2 or better around 109mph.

Tofu

Not to take this off topic, but Cody do you know approximately what an LS1 GTO would run ET wise with Pacesetter LT's, OR-Y, and dynomax bullets as it's only mods? T-56 equipped and an average driver...on street tires.

Cobalt443

Mine dynoed at 343 rwhp 336 rwtq completely stock

Ain't that the truth......ours gets up to 228* F while just sitting in the staging lanes for a short period waiting to stage

codyss

How many miles were on your car when you dynoed it?


And Tofu a 2004 GTO with those mods should be able to run low 13's on average.

Is this a friends car?

If so let him know that even the 2004 uses a h-pipe with true dual design, or should I say twin pipe since the pipe in the middle is only a brace.

Tofu

Thanks, it's actually a kid at a local meet that likes to run his mouth. He's an idiot really, he is always saying how superior the LS1 GTO is compared to the LS2; for instance last night he said "with the cam I'm getting I will be at 415rwhp, an LS2 GTO with the same mods as me will not make near the same power because the LS1 heads flow better than LS2 heads."

Needless to say he didn't even know what head castings (241) were on his car.

But anyway, he said his current mods were what I asked you about and he is "supposedly" running mid 12's (on street tires). So I had to ask the GTO experts lol.

codyss

Sounds like the kid is a little asshat.

His attitude reminds me of the guys who bought new 1997 Z28's then 6 months later the LS1 came out.

He for sure isn't running 12's with only those mods.

CbYellowSS

if im running gm stage 2 tune with my stuff will that hurt me any???

and i was throwing up those numbers but im not dynoed yet

and to tell u the truth we actually raced 3 times 2 were 2 cars and 1 was even until about 100+

oh yea and i havent got a chance to go from a dig with him yet because my next mod is a new clutch

aznpariah

Yeah those 6.0 GTOs are fast....

Check out my video of me racing one.... i had only a cai, he had only a cai.... I ran a 14.8 that run, he ran a 12.8.... got me by about 2-2 1/2 car lengths mostly becuase of me taking a nap at launch....lol

http://vids.myspace.com/index.cfm?fu...oid=1401163460