Quote:
Originally Posted by smashhell
I believe the standard is 1.15.
So in this case the M5 is generating 606 HP at the crank
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I've definitely seen 1.15 used too. I believe that equates to 15% drivetrain loss, where 1.21 is 17%. I see the 15% used more with rear/mid engine cars.
Either way, it's at least 50HP underrated.
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