Quote:
Originally Posted by M235ForNow
I did the CDV mod in both of my Z3's. It certainly made a positive difference. The CDV valve is just a restriction and doing the mod just means drilling the hole bigger, or replacing the valve with a length of "not restricted" tube. In my case I ordered a modified DCV (drilled) and swapped it with the original. The user control of the clutch engagement is much enhanced for fast shifting. If you're shifting slowly there's no particular effect. The purpose of the CDV to just to protect the system from someone who is shifting "too fast" and not coordinating the clutch/throttle properly by enforcing "slow" due to the restricted opening. In other words, avoiding warranty repairs from inexperienced manual transmission users by not letting them hurt the tranny at the expense of reduced control for those who DO know how to shift.
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Where did you get the modified DCV?