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      06-30-2008, 11:07 PM   #1
rmashman
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E92 M3 does not have Clutch Delay Valve (CDV)

I ordered two Clutch Delay Valves from my dealer so I could try knocking out the valve as described in the 335 Forum.

I got them today and they have no delay valve in them. They are a clear pipe with diameter of about 4.5mm

Check this link below. This shows two photos 1) a view of the plastic pipe with the small opening, indicating the CDV. 2) has the valve knocked out.

The parts I got from BMW look exactly like photo #2. They are basically a connecting pipe with no mechanism

http://www.billswebspace.com/BMWCDVMod.htm

My parts guy always orders parts by my car serial number.

Although the parts for the M3 and 335 look identical they have a different part number. M3 part # 21 52 2 283 914.

Zeckhausen hadn't yet looked at an M3 CDV so they didn't know if it was the same or different than a 335.

I suppose its possible that the one in my car has a CDV in it but I have not noticed any shifting problems. So for the present I am going to assume the my car has the part number above.

Another indicator is that unlike the 335 which has the number 25 painted on it with two stripes. The M3 piece is all black with no painted or other numbers or bands on it.

The next time my car is up on my lift, I will take off the transmission cover and confirm that the CDV housing is free of any markings.

One less thing I have to do.

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      07-02-2008, 07:13 AM   #2
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That's interesting, but not surprising. The e39 M5 didn't have a clutch delay valve, but the e46 M3 did and they were made at the same time (well 2001-2003 were the overlapping years).
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      07-02-2008, 07:19 AM   #3
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hmmmmmm....good to know
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      07-02-2008, 08:41 AM   #4
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This is the second post I've seen about this. One other company on here doing a M3 build took out the piece and noticed there is no valve in it too.
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      07-02-2008, 01:53 PM   #5
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Thats great to hear I was told otherwise. I am glad you found this out
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      07-02-2008, 02:29 PM   #6
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All this CDV interest is a tad bit odd to me. Who cares if there is a CDV if you like how the clutch operates? It's easy to tell if you have CDV - just pop the clutch. If you have to pick up your head off the back seat you don't have CDV. If the clutch slips a while, you've got it. Generally the only time BMW adds a CDV is if the powertrain can't handle the impulse/torque of the engine without long term damage. Not a problem on the M3
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      07-02-2008, 02:32 PM   #7
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^^ the problem is we're mostly unhappy with clutch/shifter feel. we're just looking for enhancements like ssk, etc..
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      07-03-2008, 07:55 AM   #8
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No offense, but I don't understand why people are not happy with the clutch and the shifter length. I think everything works really well. I've never had a mishift, and the clutch engages quickly and always does what I want it to do. As I put more miles into it, the slight 1-2 resistance has improved significantly. I can only imagine things will be much better at 10000 miles. My only issue was with pedal spacing for heel and toe, and I solved that with a slight extensive plate I cut out and screwed down.

Thanks to the OP for verifying that the car does not have CDV though.
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