First Dyno Run - The Unofficial BMW M5 Messageboard (m5board.com)

Bodyshopman · 8th October 2008, 17:44

Hi everyone, this is my first post so forgive me if there are any mistakes, I got my M5 Dyno'd yesterday and am now thinking i'm missing a few bhp, I have attached the report so maybe you guys can tell me if you think there may be a problem.

///Marshall · 8th October 2008, 18:15

First thing I see is that the tq vs hp curve doesn't cross at the 5252rpm
mark. Looks like something is wrong with the dyno.

mishkinm5 · 8th October 2008, 18:49

Mid 420's is an average dyno number for the e60 m5's.

Mike

cjm6 · 8th October 2008, 19:03

Quote:

Originally Posted by ///Marshall

First thing I see is that the tq vs hp curve doesn't cross at the 5252rpm
mark. Looks like something is wrong with the dyno.

I think they dont cross at 5252 because hp on the left has a range of 140-480 while torque has a range of 250-360

joshd · 9th October 2008, 02:29

I'm not sure what the accepted drive train loss % is for the E60 M5, but just for example let's say it's a 16% loss from the crank to the rear wheels (which may actually be low?):

bhp = whp / (1 - .16)

They measured 426 horsepower at the wheels

bhp = 426 / .84

bhp = 507.1

Seems about right