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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Clutch Delay Valve?...better shifts



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      01-22-2008, 08:14 PM   #1
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Clutch Delay Valve?...better shifts

Can someoen help me understand exactly what this is and what it does? The claim is that a modified version can give faster shifts. TIA
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      01-22-2008, 08:15 PM   #2
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i want to know too... i havent noticed a difference, but noticed how the car pulls u back when u depress the clutch
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      01-22-2008, 08:16 PM   #3
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Whatever nabil
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      01-22-2008, 08:18 PM   #4
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LOL!!!

OC KIDS hahahahaha

i gotta drive em back to back i guess to notice
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      01-22-2008, 08:32 PM   #5
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It's a valve that sits in the hydraulic line for the clutch. It's supposed to let the fluid flow freely when you press the clutch pedal but slow down the fluid flow back and as a result of that slow down the speed with which the clutch assembly grabs the clutch plate. All this is done to avoid sudden loading of the driveling and potentially avoid broken gear teeth etc.

Now part II of the story is that even though it's supposed to have no resistance to the flow of fluid while pressing the clutch pedal it in fact does, very little and therefore the transmission stays "loaded" for a split millisecond longer.

So all and all it slows down the process of shifting.

On my coupe it's virtually unnoticeable and I didn't even bother removing it, on my wifes E90 328 however I can feel it more... sort of like on my E46.
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      01-22-2008, 08:34 PM   #6
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^ nice. thanks man.

yah i've seen it, the fluid canal that goes thru it is just 2x bigger than stock
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      01-22-2008, 08:37 PM   #7
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For more info on how to delete or get a modified CDV, go here..

http://www.e90post.com/forums/showth...ght=CDV+Delete

and here..

http://www.zeckhausen.com/CDV.htm
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