Quote:
Originally Posted by Muffnbluff
You are wrong, wrong, wrong, wrong.
If you had after tax earnings of $85 and your tax rate was 15%, would you multiply 85*1.15 to get your before tax earnings. No. You would take 85/(1-.15).
Granted, with a dyno the drivetrain loss is unknown, but the appropriate way to back into crank is to divide by (1 - drivetrain loss %).
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this is always the way I have done it as well... but it's easier to just simply talk in terms of WHEEL HP, and leave others to do their own math and generate their own figures... because indeed... there is no reference for the flywheel numbers (we already know that the 1M is under-rated from the factory) or powertrain loss readily available.. (the 15% figure is a rather arbitrary number that works "close enough" but could differ from one make of vehicle to another..)