Just saw this on another board, so I thought people might want to discuss it here, too.

http://www.dfwstangs.net/forums/show...54#post1653154

Doesn't look like underrated, or does it? No mention about the tranny, though...

TS

 

It's an M6.. Silver color. Got that information from the owner at LS1.com.

Pretty good run and that Torque curve is FLAT....

 

Good find!

Assuming it's really 350 crank HP than that's less than 13% drivetrain loss. If I was to throw up a guess, I'd say it's putting out no more than 360 at the crank.

Funny thing is I've seen more than a few 01-02 F-body Dyno's that put up basicly identical numbers.

 

You beat me to it!
I'm sure there has been a number of LS1 Z28's that have put that out.........
Mabye I'm think of the SS dyno's I've seen..........

 

Well don't forget that when it breaks in, those numbers will get a decent bit higher in keeping with other LS1 cars. It's not too impressive right out of the box though since the F-bodies could meet or beat those numbers......................it just shows you how under rated they were.

 

At 305rwhp and 328rwtq its not too shabby. I would've expected a little more but there is no telling how many break in miles the car had, hopefully very few. This car could be more in the 310rwhp / 330rwtq range after break in. Its not going to suprise any F-body or pull 12's off the showroom floor but its certainly plenty stout for what it is.

As for a stock LS1 F-body my 99 M6 SS was rated at 320hp but it put down 309rwhp and 327rwtq when it was dynoed, stock 18,000 miles.

 

Dont forget that F-bodies are putting that power through a solid rear axle. They have less drivetrain loss.

 

That's pretty damn good. 360 at the crank. It's 10 more than advertised.

Could be the GTO is cammed for more torque. I'd like to see a bone stock '02 M6 LS1 dyno for comparison.

 

How much more is the losses from a IRS setup than from a live axle?

 

Good numbers. People should remember, this GTO isn't just a drag racer.

 

Bone stock 02 M6 LS1 dyno in the link in my sig, page two. Very similar numbers.

 

Yup. Any difference can probably be attributed to environmental conditions and the the motor not being broken in. Looks like the '04 GTO motor is the same as the '02 LS1.

 

Probably even less, depending on the type of differential. I think its a 8.5 ring gear, I dunno, something like with what Ford did with the 8.8 and the thunderbird.

Plenty efficient.