Quote:
Originally Posted by bobby35ny
same dyno, the G8 GXP made 351.
Camaro makes 13hp more, thats seems right to me, I think the g8 makes 415 from gm no?
just checked things, ya 415 from GM, 11 diff. looks like camaro did even better.. 
-bobby
65355 says the below which I kind of agree with.
I'm thinking intake/exhaust bottleneck OR which I fear..........driveline lose maybe due to the irs design?
Wish there were a way to test the amount of loss through the drivetrain.
1) Either Chevy's numbers are overstated for crank hp
2) Or Dodge's numbers are understated
3) Or there is a large difference in driveline loss between the two cars. (doubt it since it's an identical trans...)
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being that the LS3 is an SAE certified engine, it likely is not overstated. The 6.1 hemi (all hemi's, really) are NOT SAE certified, meaning it is possible they do make a little more power than their advertised 425 hp. Dodge probably chose 425 hp so that it would match their old hemi's for marketing purposes.
from what I've seen 12% driveline losses seems to be the standard for manuals, 15% or so for auto's.