Quote:
Originally Posted by Dackelone
^^Yup! Remember when the transmission specs(N55) came out... the trans (or maybe it was the clutch) can't handle that much power. I think it was rated only at 380Nm or so. I can't remember exactly.
A 1M puts out 450Nm +50Nm on over boost.
Also... I know when I got my German flash tune... my tuner said most (135i)clutches only last about 30K kms with one of his tunes. I don't shift hard... and since then I have about ~50K on mine now.  |
Around the 1M development, the transmission was rated by the supplier up to 450Nm, and the engineering team then had to agree with supplier on tests that BMW M themselves would do to qualify up to 500Nm. It seems likely that transmission contributed to the reason why the peak torque is be limited in duration, ie boost period only.