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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 11-15-2012, 01:20 PM   #20
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Join Date: Aug 2011
Location: Houston, TX
Posts: 154
My Ride: 04 330Ci ZHP
Originally Posted by EverydayGetaway View Post
Your logic is extremely flawed. The whole point of the dual mass flywheel and cdv is for smoother shifts...

Sent from my DROIDX using Bimmer App
wrong. CDV is to prevent damage to the drivetrain from aggressive driving. here's a quote from the Zeckhausen website:

The Clutch Delay Valve (CDV) is a one-way restrictor installed by the factory between the clutch slave cylinder and clutch master cylinder, as shown in Figure 1. It "delays" the engagement of the clutch, much like old record players use a damped tone-arm to gently lower the needle onto the surface of a record.

Because of this valve, no matter how quickly you lift your foot off the clutch pedal, the clutch engages the flywheel at a constant (slow) rate. In theory, it can save the driveline from shock, were an inexperienced (or immature) driver to dump the clutch. But in practice, all it does is prematurely wear out the clutch and turn experienced drivers into people who, despite years of practice, cannot shift smoothly.
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Last edited by webster; 11-15-2012 at 01:20 PM.
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