Cool. Was that a pre-production car?

Makes sense that it would be around 350 RWHP (which would put it very close to its 400 HP rating, perhaps a bit above it), as the 04s seem to average close to 300 RWHP.

Agree with your 1/4 mile potential assessment.

 

The '05 GTO A4 dynos at 350-355 rwhp and 345-350 torque. So I imagine the M6 would be in the 370 rwhp and 360 torque range.

But don't quote me on that, I haven't seen a dyno on the M6 yet.

 

One site had a LS2 GTO dyno 428HP assuming 18% drivetrain loss on the auto

 

At the rear wheels? Stock? I find that hard to believe.

 

That's about what i figured - 430 hp and 425 torque at the flywheel.

 

05 GTO Dyno - Factory Stock

 

Yea, Ive seen that. It was an A4.

 

yup thats the one. 351RWHP -18% loss for the auto = 428HP at the flywheel

even with 15% loss thats 413HP at the engine

 

The LS2 is not making 428 hp at the flywheel. If it makes those kinds of rwhp numbers, then maybe the autos have gotten better in terms of power transfer efficiency. Maybe 14% is a better number for the 4L65E. Of course, power to the wheels is what moves you, but do not read these dynos and just assume that the LS2 is underrated by 30 hp. That happens too often in here, imo. Some around here have seen actual engine dyno results, and 400 hp is a pretty good number.

And that is still badass. Let us all remember a short decade ago when the 275 hp, 14.0 @ 101 mph LT1 Z28 was a sickening amount of bang for the buck. Now the GTO, for a little more cash, is making 400 hp. The vaunted, $70 grand + ZR1 made 375 initially, and 405 in final form. It is unbelievable how many cars make well over 300 hp now...

 

How do you know the LS2 isnt making that power? I think the times of ET's telling the story of power isnt true now with torque limiting programing. Its on the GTO, its on the C6, adn its on the Mustang. 428hp IS possible on a broken in LS2, but im sure not all will dyno like that.

 

Stock, in the car, the engine has to deal with all the emissions rules, torque management (which is mainly during shifts and lower gears, I believe), and is fueled and sparked accordingly. Is a 6.0L small block V8 with LS2 heads CAPABLE of that kind of power? I'm sure it is. But the fact remains that emissions standards are there, and spark has to be released as a factory calibration in such a way that those standards can be met.

What the aftermarket tuners will get is a different story. But I'm saying that stock, out of the box, the engines are rated pretty spot on now. And if we are getting better at putting that power to the ground (as BMW always seems to be; I swear their cars almost always perform better than their power/torque ratings and curb weight suggest that they should), then that is great. I'm just saying that the LS2 should make around 400 hp as advertised, give or take, and that is a good thing.

 

Anything is possible....400....410...420....428. That dyno above is very good - where did it come from? Link to the thread? (I can't seem to find it). Also, wouldn't it have to be a pre-production car?

Also, what are LS2 Vette's dynoing? Links to any of those, please. (my search skills suck today - I have tried)

Thanks.

 

From what is posted about the LS2, its basically an LS6 with some more cubes. Comes with "243" LS6 heads and the cam is an '01 spec LS6 cam. Those made a rated 385HP back in '01 on 5.7L. Add a few cubes and 400HP. I seriously doubt it'll be 420+HP but has a lot of room to grow.

I speculate that the '02-04 LS6 cam will be in next year to add another 10-15 rated HP. Then more minor tweaks to give it a little more each year.

 

I found the thread, but couldn't find where it said if the car was an A4 or M6. If you have the reference, please post. It is obviously a pre-production car, with the thread dating back to July.

I also found some LS2 Vette numbers...seems they are averaging between 345 and 355 RWHP stock (of course, some are a bit higher, some a bit lower). I see no reason the GTO wouldn't put down about the same.

 

Some Vette numbers...

Keep in mind that no tool for tuning is available yet...I see some NASTY numbers within a year or so.