In Reply to: Is 1.21 too high? ...more posted by MattH on April 30, 2000 at 22:20:35:
>I don't know what they dyno at the flywheel but if we assume that the average is the factory speced 240HP then that gives a multiplication factor of 1.17, not 1.21.
17.5% drivetrain loss is what Active Autowerke was using before, and then Jim Conforti clarified it on the MSERIES.com board as well...
>I realize that it's possible that the stock engine is putting out more than 240HP but the standard use of the 1.21 correction factor opens the door for some shady business practices.
Yes, it's possible, and happening. BMW has been understating their specs...you'll also notice that many are dynoing more peak torque than HP as well, ie 208 rw trq, (not 236 ft-lb at the flywheel)..the average, from what I've seen and read is between 204-208, with a few in the teens..you're also correct in the shady business practices comment, happens all the time...CYA>PM3