Camaro SS 2010 on dyno makes 364 whp & 371 rwtq !! Vid inside

[Hillbilly]

http://www.woodyg.com/fairlane/finfo/etrwh.html
http://www.race-cars.net/calculators/et_calculator.html
Here is a couple links to play with.

[Hillbilly]

Originally Posted by Krobar

I dont think they are bad at all for stock #'s. The SRT8 got 356 RWHP stock so we are ahead of the game there. http://www.dragtimes.com/Dodge-Chall...lip-15527.html

Yep
And with the extra weight I read a review (SRT 13.9/Camaro13.0)Way ahead now

[1fastdog]

Originally Posted by silverc5vert

The engine was at normal operating temperature (coolant temp around 220), SAE correction factor, 1,000 miles, traction control has to be off to run on the dyno, 93 octane fuel, and a/f wasn't logged, we were just doing power pulls.

-Rick

Thanks!

I don't see an issue with the numbers. Did you mention the dyno is a bit conservative with readings? If so, that is better as a tuning tool. Generous dynos are something I avoid.

I tend to believe that between 13% and 14% is a closer number for a loss factor. Multiplying the flywheel by .86 or .87 is my personal rule of thumb for an IRS RWD car with a manual tranny. By no means a hard and fast rule, as drivetrain losses can vary due to a number of factors, even between same model vehicles.

A plus of minus 5 HP isn't considered out of the question from a dyno pass.

Low mile engine and trans, stingy dyno, 5HP error factor....

I can't see why folks are anxious over this dyno pass.

Without an AFR, IAT, and knock retard readings? More reason to not be worked up.

[Q8-CamaroSS]

Camaro is the New Drag Race Muscle Car end of discussion ..!!! Just Imagine a Camaro with 16 inch Rear's with Sticky tires Umm Mean Machine !!

[tom692010]

I know every cars a bit different but this is no where near the 425 the are advertising. With a little work though once mine arrives I'm sure it will get there. Now let them dyno the Challenger which is supposed to be 425 also and see what it gets.
Still wouldn't change my mind 1ss iom in 2mo!

[z28xtreme]

Originally Posted by Muscle Master

Compared to the SRT8, again maybe it's the gearing

What is the gearing for the manual SS anyway, The SRT8 gearing is 3.92 axle ratio with 20 inch rims

The R/T is 3.73 with 18 inch Rims

gearing has nothing to do with the horsepower. hp is hp plain and simple. the rims dont either.

[UCF w00t]

Originally Posted by tom692010

I know every cars a bit different but this is no where near the 425 the are advertising. With a little work though once mine arrives I'm sure it will get there. Now let them dyno the Challenger which is supposed to be 425 also and see what it gets.
Still wouldn't change my mind 1ss iom in 2mo!

The 426HP advertised is straight off the engine... not at the wheels. This is normal.

And the challenger has been dynoed...

Originally Posted by Krobar

I dont think they are bad at all for stock #'s. The SRT8 got 356 RWHP stock so we are ahead of the game there. http://www.dragtimes.com/Dodge-Chall...lip-15527.html

[Chocolate Apocalypse]

Originally Posted by z28xtreme

gearing has nothing to do with the horsepower. hp is hp plain and simple. the rims dont either.

Actually they do. If you take a 4th gen w/3.42s, dyno it, swap in 4:10s, dyno it, you'll end up with a few less ponies running the 4:10s. Also, the weight of a tire/wheel combo makes a difference. Bigger/heavier combo will result in lower numbers on the dyno vs a smaller/lighter combination.

[gunslinger]

Probably the biggest difference between the Vette and Camaro RWHP numbers is in the IRS design.

From what I remember reading, the Vette has a more efficient IRS design, allowing more HP to make it to the ground. (It also probably had less rotating mass because it doesnt have to accelerate a car weighing ~4000 Lbs.).

So my guess is tuning and exhaust make up about 5 RWHP and the IRS makes up the other 5-7 RWHP on the Vette.

[gunslinger]

Originally Posted by Chocolate Apocalypse

Actually they do. If you take a 4th gen w/3.42s, dyno it, swap in 4:10s, dyno it, you'll end up with a few less ponies running the 4:10s. Also, the weight of a tire/wheel combo makes a difference. Bigger/heavier combo will result in lower numbers on the dyno vs a smaller/lighter combination.

The gears actually do not make any difference, it is just that the 4.10's are less efficient, meaning the actual ratio makes no difference. The heavier wheels do make a difference because they are a rotating mass connected to the engine and the less mass the engine has to accelerate, the higher the HP.

The way the dyno calculates HP is by accelerating a known weight and the speed of acceleration of that weight determines the HP. So gears have no effect on the HP reading because gears only multiply torque, not HP.

[G8GT4now]

Livernois dynoed a GXP with very very low miles on it (17 miles I think) and it put down 350ish hp, the same car 1000 miles later put down 370ish. Both videos are in this thread.

After a catback, roto fab intake, and tuning, that GXP now puts down 410ish RWHP.

http://forum.grrrr8.net/showthread.php?t=4830

[65535]

Originally Posted by gunslinger

Probably the biggest difference between the Vette and Camaro RWHP numbers is in the IRS design.

From what I remember reading, the Vette has a more efficient IRS design, allowing more HP to make it to the ground. (It also probably had less rotating mass because it doesnt have to accelerate a car weighing ~4000 Lbs.).

Due to the fact that the car is stationary on the dyno, inertia is zero.. So curb weight makes no difference whatsoever in recorded hp numbers

[DGthe3]

Originally Posted by Hillbilly

AS an old drag racer I see the numbers on the reviews and something looks a bit off.

The 1/4 time seems a little slow for the trap speed show. 111 MPH trap speed. I would think with a great lauch the car should run low 12.90's.
Also with a trap speed of 111 I would think the rear wheel horse power would be more like 380

Just my thoughts from watch a bunch of timed runs over the years.

Winter test makes for poor grip and very dense air, so slow launch and high trap.

[JJ#48Racing]

Originally Posted by Muscle Master

Compared to the SRT8, again maybe it's the gearing

What is the gearing for the manual SS anyway, The SRT8 gearing is 3.92 axle ratio with 20 inch rims

The R/T is 3.73 with 18 inch Rims

3.45 for the camaro SS M6

Originally Posted by Hillbilly

AS an old drag racer I see the numbers on the reviews and something looks a bit off.

The 1/4 time seems a little slow for the trap speed show. 111 MPH trap speed. I would think with a great lauch the car should run low 12.90's.
Also with a trap speed of 111 I would think the rear wheel horse power would be more like 380

Just my thoughts from watch a bunch of timed runs over the years.

The mags don't test on an actual drag strip. They use a section of road or straight section of road course. Thus the higher e.t. usually.

Originally Posted by tom692010

I know every cars a bit different but this is no where near the 425 the are advertising. With a little work though once mine arrives I'm sure it will get there. Now let them dyno the Challenger which is supposed to be 425 also and see what it gets.
Still wouldn't change my mind 1ss iom in 2mo!

364rwhp is just over 14% loss from 426fwhp. These numbers are spot on especially considering the car only had 1,000 miles on it.

Originally Posted by z28xtreme

gearing has nothing to do with the horsepower. hp is hp plain and simple. the rims dont either.

Gearing has nothing to do with fwhp, but it does affect rwhp. Numerically larger gears require more energy to turn resulting in more drivetrain loss and lower dyno numbers. But on the street the extra leverage from the gears makes the car quicker. Big wheels usually result in more weight which also cause more drivetrain loss and lower rwhp.

Originally Posted by gunslinger

The gears actually do not make any difference, it is just that the 4.10's are less efficient, meaning the actual ratio makes no difference.

The way the dyno calculates HP is by accelerating a known weight and the speed of acceleration of that weight determines the HP. So gears have no effect on the HP reading because gears only multiply torque, not HP.

HP is a multiplication of TQ, so if TQ is multiplied by gears, then the gears indirectly affect HP. Fwhp is not affected by gears, but rwhp is.

Originally Posted by 65535

Due to the fact that the car is stationary on the dyno, inertia is zero.. So curb weight makes no difference whatsoever in recorded hp numbers

He was refering to the weight of the dyno drum, not the car's weight.