Hey Chuck....the car is a 95 Z28 Camaro. Motor has just been completed (383, 8.5:1 compression, centrifugal blower with 5 psi boost, full cam, heads, forged internals, the whole works). It dynoed out at 461 HP and 442 lb. ft. of torque at the wheels. I was just trying to figure out the flywheel HP & Torque. Is that called the bhp too?
The weight of the drivetrain is the big cause of parasitic horsepower loss. It doesn't change as the horsepower goes up but frictional losses would be somewhat higher. There is no basis to assume a constant percentage of loss as the power goes up. It is not really a percentage of anything. There is simply a certain number of horsepower claimed by parasitic loss. That is why 300hp cars seem to lose 15% with a manual tranny and 450hp cars lose 10-12%. With more gear on gear pressure and greater fluid resistance in the tranny and diff as the power goes up you can expect there has to be some increase in the loss but it would be less of a factor than rim, flywheel, or driveshaft weight and obviously much less than all these combined.
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