Quote:
Originally Posted by Dalko43
I'm not following your math at all.
EAS claimed the M4 had 414HP at the wheels. In an earlier discussion with someone else, I used 15%, for the sake of argument, as the drive train loss. That yields 487HP at the crank, which is why I doubted EAS' claim.
Just recently, someone else posted a M4 dyno test done by Motor Trend which yielded 379HP at the wheels. The article used 13% as the drive train loss, so not too different from what I used with EAS test, which yields 435HP at the crank; still a bit higher than BMW's claimed 425HP at crank, but much more believable than 487HP.
So I don't see the point of 425HP - 414HP = 11HP. 425 is crank HP claimed by BMW and 414 is wheel HP claimed by EAS.
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BMW's claimed hp for the S65 is 414hp (crank)
BMW's claimed hp for the S55 is 425hp (crank)
I never mentioned anything about the EAS dyno of 414whp. this discussion is all about whether the new motor is underrated, is it not??? we're talking about BMW's hp rating.