[kountzecobra]

I have an old friend that worked for Roush Racing in their Craftsman truck division that told me something I had never thought of. He said, on an average vehicle, the drivetrain loss is about 15 to 24% until you get to around 250 to 300 RWHP. After that, it seems to lessen percentage-wise on up the horsepower scale. If you took a car running at 250 hp and replaced the engine only with one that produces 500 hp, the loss would not be 15%, but maybe 9 or 10%. However this was a theory at that time and hadn't been proved well enough to get real numbers. To simplify, he used 15% for manual trans and 20 to 24% for auto trans. These are with parts in top condition. Something for you engineer types to think about. Me, I don't know.