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      10-27-2009, 03:04 AM   #34
chris719
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Drives: '08 M Roadster
Join Date: Oct 2007
Location: NJ

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The fact is, the grind isn't affected by the CDV unfortunately. For me, the grind happens rarely and only once has it happened at redline; it's almost always either a really low rpm shift or moderately high shift that does it.

Personally, I don't know if it's only the synchro, I think it's also got something to do with the selector rod / linkage or something like that also. On days when the cabin of the car is really hot, the 1->2 roughness is nearly gone. It doesn't seem to be ambient temp, it really does seem like if my car has been parked in the sun and the interior is hot that the notchiness and resistance on entering 2nd is nearly gone.

One tip I saw somewhere on this forum that seems to help is to put some leftward pressure on the stick when making the 1->2 shift, and since I've been doing that I haven't had any grinds.
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