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Hey Matjow,

Heres the way I always figue it. I know that there are many variables between auto trans and standard, also in which dyno you use and what temperature, elavation and humidity is at the time of measurement. But ON AVERAGE when you are measuring (dyno) rear wheel h.p. if you allow 15% loss in the drive train you will be pretty close to accurate flywheel h.p. The automatic loses a little more and the stick loses a little less. For example, my LS1 Camaro dyno'd @ 323 rwhp. If I divide that number by .85 (15% loss) I come up with 380 flywheel h.p. My S.L.P. Camaro was rated at 345h.p. and as you can see it is a little under rated. All LS1's are under rated from the factory and that is a good thing. If the 6.0 liter vette engine is rated at 400 h.p. then dyno numbers should be around 340 rwhp. I think when you start seeing more '05 and '06 SSRs getting dyno'd this is the average number you will see. 340rwhp divided by .85 = 400 fwhp.
Just an interesting side point, remember Brake H.P. (bhp). Thats the way all the muscle cars in the 60's were measured. You would have to use a 25% adjustment to come up to accurate rwhp. Let's say you had a 427/425 b.h.p 1966 vette (which I did). This car would come in at around 320 rwhp on a dyno to be equivilent to 425 bhp. 320 divided by .75 (25% adjustment) = approx 425 bhp.
Anyway that's the way I recall it and I hope that I didn't confuse you. :seeya
 
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