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      09-21-2019, 12:30 AM   #52
M6-Coupe
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Drives: F92 M8
Join Date: Feb 2014
Location: Bay area

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Originally Posted by MartinS View Post
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Originally Posted by DPelletier View Post
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Originally Posted by gheumann View Post
You're measuring at the rear wheels, yes? Then I'd say they're better than BMWs numbers which are presumably just the engine?
Yep, I assumed that's what he was trying to say?...... 15% driveline loss would put it at around 448hp net flywheel and 10% would put it at 424hp net flywheel. Good numbers in any case. :-)

Funny thing was when I first test drove an M40i and was worried about the power compared to my V8 Ftype, the sales manager said that BMW typically underrates their engines and that the net flywheel rating would be what I could expect at the rear wheels.....guess he was right on the money. Car certainly felt faster than I expected though the 400lb weight advantage vs. my F type was responsible for some of that...

Dave
Why do people say the loss in % in the transmission?
15% on a 1000hp engine would be 150hp loss but only 15hp loss in a 100hp engine.

My M4 has about 64hp loss in the driveline. That would be 64hp loss nomatter how many hp it has, right?
The powertrain loss is the function of many variables including input power and temperature. The more power is generating more heat and the result is more power loss. Its completely nonlinear function but still depends on input and components' behaviour...
It also varies per designs as other said 10-15%
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Current : 2020 F92 Black Sapphire M8 - ZF8
Gone : 2018 F80 Mineral Gray M3 - 6MT
Gone : 2016 F82 Austin Yellow M4 - 6MT
Gone : 2013 F13 Sakhir Orange M6 -7DCT
Gone: 2013 F13 Alpine White 650i -ZF8
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