Quote:
Originally Posted by XutvJet
Thank you so much for taking the time to write this up.
This utter POS CDV makes normal driving with the 6MT needlessly jerky and clunky. I've been driving manuals for three decades now and this is by far the most difficult manual to drive smoothly. The CDV really makes you have to think about clutch modulation and it can make the catch point move around a bit. It's as if BMW intentionally added this device to push people towards buying automatics. I've owned this car for 3.5 years now and it is by far my biggest complaint with my M235 6MT (same tranny as the M2).
The intended purpose of the CDV is to reduce hard shift shock and drivetrain damage on hard shifts. Oddly, when driven in anger, I find that the 6MT is exceptional. I can slam gears hard with a nice firm and direct shift and engagement. I can tell the clutch is robust and sometimes a strong clutch can make engagement difficult, but the CDV is the main culprit for the issues I have.
I've learned that the smoothest way to shift is to delay the 1-2 and 2-3 until ~3,500rpms. Shifting earlier than that makes it difficult to execute smoothly. Shifts 3-4 and above aren't a problem.
The CDV delete is high on my list. I do worry about the bleeding though. Seems like a pain.
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I am interested to see when you remove it if it has the effect you think it will have. My experience with CDV on Z4M is that it did not really make the shifts any smoother or change the catch point, but did improve modulation from a stop and in reverse. The catch point moving is a different problem, I think. I didn't have any movement of the catch point on the Z4M even with CDV. I have noticed this on newer cars like my Mazda 3 6MT, though. I think it's just the self adjusting clutch.