Quote:
Originally Posted by Si-135i
What exactly does this alter ?
is it the speed at which the clutch engages or does remove any delay in the boost / timing etc on gear changes ?
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CDV = Clutch Delay Valve. This device restricts the flow of fluid into the clutch cylinder, slowing the release of the clutch from the pressure plate. Think of a water flow restrictor, that you might install at home in your bathroom. It simply blocks the flow of fluid.
This device has been installed by BMW to reduce shock to the drive train, if fast shifting and high revving is the mode of operation (eg. racing). So - it is a trade off, do you want a little more clutch slippage (ie. wear) - or do you want more wear and tear on the transmission, drive shaft, rear differential, rear half shafts, etc? The clutch disk is not all that expensive compared to the other components, and it is the one piece that is designed with wear in mind.
If you are going to race the car, and you don't care about warranty or costs anyways, so you might as well remove it or modify it to gain that extra 5-10% benefit in shifting. But if you plan to keep the car for several years, past warranty - and if you plan to drive it normally (most of the time) - I would say leave it in.