[Badger]

DC...Horsepower loss from engine power at the crank to rear wheels can vary greatly depending on how the car's engine is set up in the chassis vs. what the builder used on the engine dyno. Real world numbers often go far beyond the generally accepted 17-18%. Consider inlet temp, barometric pressure, tire slippage and things like alternators, power steering, air conditionong, water pump, and headers and exhaust sytems. Also ..are you driving through an independant rear suspension or live axle? 27% is probably the most honest number you'll get and nothing to be ashamed of. Badger