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Re: not correct (m) (archive)
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Posted by ben keyes on February 18, 2001 at 16:01:11:

In Reply to: "kneejerk negative response" posted by Ben FR on February 18, 2001 at 13:35:41:


If he is getting 217horsepower at the rear wheels, and the M coupe engine is rated at 240 horsepower, then his loss is 1-(217/240) or 9.58%, not 15%. 15% could be a number you would assume before you dyno'ed your car.

-Ben FR

I'm not sure what "ex ante" means, but it's a very wrong assumption to assume that just because BMW tells us that our engines put out 240hp that's what they put out.

it is a widely held & backed up with data from many sources (lots of people have seen higher results on dyno's with no mods & JimC and others who do tuning as a business state the same) that the M coupe engines put out around 250hp stock. I would say that 217hp at the wheels is a very strong result for an M coupe, but not out of the question by any means.

the best way to determine the correction factor for the M coupe is to check multiple sources to see what they have seen in terms of losses on the specific drivetrain - I believe that the 15% figure is within a few % of what I recall being mentioned here before.

Ben
'99 M coupe - likely 240-250hp
'87 332is - likely more...

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