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The accepted power train loss numbers for MB are 18% loss for autos and 15% loss for manuals. Bob Brady from Renntech confirmed this to me as well as just about any major MB tuner out there so you are very safe to use these percentages. 2 years ago Acura was claiming a certyain bhp numbedr for thier car and once tested it was shown to be 15bhp lower so the SAE recalculated the program for determinng BHP and still I know some new cars still have high end BHP claims. Dyno jet tells all. Top Gear road tested the new Mustang Shelby GT500 and it made less than what Ford claimed. The video is on Youtube.
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