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Tim,
Usually about 15%-20% loss. Depends on transmission, exhaust, etc. Also, engine dynos vary in their numbers.
I believe that in the 1960's manufacturers rated their cars on engine dynos with nothing hooked up that would take HP away to get higher numbers to sell more cars by having bragging rights to "more is better".
Some engines like the Chrysler Hemi and Ford Cammer were rated far lower than what they actually produced to allow their truly outrageous HP numbers to get by things like insurance companies.
Basically what your car does on a road or track is the only thing that REALLY matters. 0-60 or quarter mile times are best to see what your car ACTUALLY does powerwise. Even chassis dynos do not accurately reflect what your car will do in "real life", since your vehicle is strapped in straight and traction is not as big an issue as on the road.
Hope this helps.
Cheers!
Dave
__________________
Dave
Nolite id cogere, cape malleum majorem - Don't force it, get a bigger hammer.
Last edited by ROUSHAC; 08-10-2006 at 11:50 AM..
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