Quote:
Originally Posted by Dinan_Engineering
12-15% drivetrain loss is typical for RWD vehicles. On AWD vehicles it can be upwards of 25%. If I recall correctly it peaks at about 22% on most late model BMW's.
Those numbers are based on years of comparison testing really. In the early days we would rip out the engine and put it on our engine dyno and get numbers. Then put the engine back in the car and put it on the chassis dyno to see what kind of losses were involved. We haven't done that in a few years but you get the idea. Now with more sophisticated chassis dynos you can extrapolate even easier then in the past without ripping out an engine.
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Thanks! The stock crank #s just seem high. My M550i is definitely strong but seems a bit less top end power (above 5k) than my F10 M5 was. It was the non-comp too, so 560 rated HP....
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2020 X3M non-comp, Alpine White over black : Exec Pkg, ventilated M Sport seats, 20"s
2020 M2 Comp, Sunset Orange/Blk: Orange stitching, DCT, exec pkg, bicolor rims
Gone '18 M550i, '16 X4 M40i, '15 M5, '13 X3 35i, '12 335is, '11 X5 50i, '09 Z4 35i, '08 550i, 06 X3, 06 650i, '02 M5, '99 540i