In reviewing Suneil's impressive 401 wheel horsepower rating, a local pope said the following about crank horsepower:
Quote:
For the reverse bench racing folks that's edging near the 500 CRANK HP mark.
Is there any real reason that 400 wheel horsepower would relate to 500-ish crank horsepower?
Think about this logically: crank power is obviously greater than wheel power because of drivetrain losses through the trans, diff, etc. Look at a stock 2.5 SVT dyno (usually shows about 165-ish hp, compared to 200-ish crank hp) - that indicates to me that losses are about 35-ish hp.
Is there any reason to believe a high-boost 2.5 turbo has 100-ish hp of losses, compared to 35-ish for stock? Obviously not. This defies logic. Losses cannot increase just because output has increased. It still takes the same torque to overcome friction in the trans, etc. A neat turbo sitting upstream doesn't suddenly make the drivetrain 3 times harder to turn.
I understand that the 1.20-1.25 factor for crank to wheel power can be a useful tool, but to use it to calculate 500 crank hp is ridiculous.
Regardless, I am very impressed with Suneil's 401 whp/436 chp motor. 
