In Reply to: It's not 21% loss, it's factor of 1.21 (more) posted by PM3 on April 30, 2000 at 18:02:35:
I guess my real question is who has done engine dynos on their car to verify the standard factor that everyone uses?
: This is where I used to get it mixed up too. When you multiply by factor of 1.21, it's the same as adding 17.5% back to flywheel. THEN take off the 17.5% at the fly, and you'll get your rear wheel HP..but you can't get the same # by multiplying by 1.175, and expecting to get the same Flywheel HP again.
: See, RW HP has to be same as (0.825) which is 1-17.5%, mulitiplied by the flywheel HP. That will give you the 17.5% LOSS to the WHEELS, to get the RW HP. Otherwise, just multiply by the RW HP by 1.21 (or divide by 0.825), and you'll get almost the same #'s to the Flywheel. CYA>PM3
: : That is due to the drivetrain, correct? How does the drivetrain dissipate that power? Friction? Is there anything that could be done to reduce that loss? Just curious.
: : Thanks,
: : Ken