Quote:
Originally Posted by Thud
15% seems to be generally accepted for powertrain loss. Either BMW makes super efficient powertrains, or the 135i is considerably underrated, just like the 335i is.
279hp at the wheels translates to just over 320hp at the crank, using 15% loss. :roundel:
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And just to follow up, my 04 C32 AMG (auto) listed at 349hp pulled 288 rwhp on a dynojet. My 96 Mustang Cobra, rated at 305hp pulled between 260 and 265rwhp on a dynojet. The 135i motor is definitely under-rated by BMW :biggrin: