i know the 98-02 ls1 camaros are rated at 305 hp.but is that engine/brake hp,or at the rear wheels.

 

theoretically that is rated at the crank/engine

but most of them were dynoing 290-300 at the wheels bone stock. which shows that GM underrated them by a pretty good amount.

i think the most i ever saw a bone stock car dyno was something like 317hp...right down to the paper air filter.

 

310 RWHP stock for me! After mods, my new LTs and my TR cam kit, Im pushing for 390RWHP

 

Most stock LS1 F-Bodies have about 340-350HP at the motor.

 

The F-bodies were just underrated because the Corvette was rated at 345 - 350 HP since the debut of the LS1 in 1997, and GM couldn't have another car in their line-up with the same *advertised* amount of power. So, even though the motors are the same, the '98+ F-bodies were rated at 305 - 310 HP, but with SS and WS6 packages, GM would actually advertise them as high as 345 HP, which is way more realistic.

Just FYI, the way to convert between flywheel horsepower and rear-wheel horsepower is this:

RWHP = FWHP x (1 - % drivetrain loss), ie: 350 FWHP x .85 (<- assuming a 15% loss) = 297.5 RWHP..........that's a realistic number to expect from an LS1 car.

Now, take a car that dyno'd ~310 RWHP, then go 310 RWHP / .85 = 365 FWHP. Now, maybe the engine really isn't making 365 HP, but in that case, the drivetrain losses are obviously less than 15%.

 

Here's the easiest way to figure out how much power the motor is making.

Take your dyno numbers and divide them by .82 if it's an auto. and .85 if it's a manual, it's that simple.

Here's an example (mine):

296/.82 = 361 FWHP
314/.82 = 383 FWTQ

 

again that is if you tend to subscribe to the 15% and 18% camps..

I personally think the M6 is more like 12% and the A4 is 15%..


I did 318rwhp stock.. paper filter makes more power than K&N so saying down to the paper filter is rather pointless..

After my latest runs, I think I can put down 320-325ish rwhp still bone stock.. only difference is I finally put in the replacement AC Delco filter.. hehe

 

I tend to agree with you on that. Take 2 stock LS1's, A4 and M6. With 350 flywheel HP, they'd be 298 and 308 RWHP respectively...............that sounds pretty accurate.