I was expecting the acceleration to feel very similar to the M3 as the power to weight is very similar. I think because there is so much extra head room with the revs on the M3 you drive higher under normal conditions without realising. With the M50 you're more conscious of approaching the red line so instinct (and exhaust noise) makes you change up too soon.
I also wonder if my diff is having an impact here as it was from an automatic donor. RealOEM says it is a 3.15 but other sources (bokchoys.com) say 3.91,which should be much better for acceleration. I actually thought it was a 2.93. The M3 has a 3.62 so if mine is a 3.15 that could account for some of the difference. So many other factors though.
I think you're right about the extra crank throw on an m54, it will give greater low end torque which is the real thing you experience during acceleration.
Last edited by morris; 4th November 2015 at 18:56..
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