Clutch Delay Valve- in E46, E39, Z8...

[aus]

I always felt the newer manual cars were difficult to shift smoothly and this is probably why.

It limits how fast the clutch releases regardless of how fast you let go of the clutch pedal. BMW must think we can't drive manual cars.

Clutch Delay Valve (http://www.zeckhausen.com/CDV.htm)

[Jared]

Some e36 M3's have them as well...

[Kevlar]

Actually, I never had a problem with my car until after I read that the new E46 M3s might have them. So I'm not sure if it's a psycological thing or if I should actually pay somebody to go and look for that damn CDV. :mad:

[Gene V]

Don't know why you would want to "drill one out" or install a modified one when you can just remove it...this was advocated sometime back by Rob Levinson of UUC in a thread he started.

I've removed mine, clutch engagement is sharper and the car feels more sporty.

BTW, my CDV looks more like a restrictor than a valve.

[Kevlar]

I went to BMW service today and they insisted that the part was not installed on my vehicle. Now I guess that is good, but if I go in there and find the so said part... that will be super interesting.

[Rob Levinson]

Originally posted by Kevlar
I went to BMW service today and they insisted that the part was not installed on my vehicle. Now I guess that is good, but if I go in there and find the so said part... that will be super interesting.

Got three documented E46 M3s with the valve so far, Kev. it is unlikely yours has one, but I would certainly check the next time the car is up in the air.

The CDV can be in one of two locations relative to the slave cylinder. For pics, see:

http://www.uucmotorwerks.com/html_techtip/techtips/check_valve.htm

- Rob