The biggest benefit you get from the CDV delete is consistency and feedback.
The thing to remember about the CDV is that it is a limiting factor, not a scaling factor. In other words, the CDV doesn't make the clutch close at some set fraction of the speed that your foot moves on the pedal - it lets the clutch close at the same speed your foot moves on the pedal
*up to a certain point*, after which any faster motion from your foot doesn't increase the speed at which the clutch closes.
The effect from the driver's standpoint is that while at slow pedal-release speeds the clutch engagement point correlates nice and directly with clutch pedal position, but when you try to release quickly, the engagement point moves artificially (and inconsistently) higher up the pedal's travel. This throws your muscle memory out the window, and most often results in you applying throttle too soon, which translates into excessive and unnecessary clutch slippage.
For that reason,
Originally Posted by
bimmeryota
I never did this mod but heard that it made the biggest primary difference in paralell parking where precise modulation is key. Is this true for those that have done it?
the thing you heard is exactly backwards - at low engagement speeds you will not notice a difference, but when driving aggressively and shifting quickly, there's a significant difference between cars with and without the CDV installed.
At the end of the day, rev-matching your upshifts and downshifts does much more to prolong the life of the entire driveline, and it's only possible to learn how to do this properly on a car without a CDV installed.