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      04-27-2008, 10:46 PM   #1
rawedge2
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Anyone do CDV (Clutch Delay Valve) Mod??

If you are new to what this is heres the scoup:
http://www.zeckhausen.com/CDV.htm

--here's the thread the topic died in - http://www.m3post.com/forums/showthr...&highlight=cdv

so simply there is a cdv in the e92 m3
i have heard it makes an improvement in the 335 feel mostly between 1st and 2nd..

anyone do this mod yet on an m3?

RissRacing.com makes a fit all bmw 6MT model for $29
-that would fit?

or is this mod not worth it..? i dont see how it could harm the car at all if you drive correctly..

Last edited by rawedge2; 04-27-2008 at 10:56 PM. Reason: ..
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      04-27-2008, 11:16 PM   #2
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dont knwo but it seemed a big deal inthe e46 M3 - I never did it - the car shifted fine for me.
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      04-28-2008, 05:54 AM   #3
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I plan on doing it at some point. I never took the CDV out of my E46, but I'd love to feel the car without it, or with a modified one.
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      04-28-2008, 11:14 AM   #4
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Ive tried to contact Riss racing regarding if it will work on the e92 m3. Never got a reply
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      05-01-2008, 12:22 AM   #5
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Yes, I removed it yesterday. I like it much better without it.
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      05-16-2008, 05:35 PM   #6
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did you simply remove, or did you order a replacement part.. if so which one...???
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      05-16-2008, 06:03 PM   #7
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Quote:
Originally Posted by Mike@ESSTuning View Post
Yes, I removed it yesterday. I like it much better without it.
What exactly does it feel like without the CDV? Does it make the pedal travel resistance more linear? I'm having trouble getting used to my clutch right now as is and might be interested if someone can explain what it feels like to them before & after. Thanks!
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      05-17-2008, 01:47 AM   #8
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Quote:
Originally Posted by rawedge2 View Post
did you simply remove, or did you order a replacement part.. if so which one...???
^
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      05-17-2008, 07:00 PM   #9
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All the CDV valve dose is reduce the internal size of the clutch line, thus limiting the amount of fluid that is able to pass though, as deturmined to be the best rate by BMW. It actually makes the clutch slip slightly, and causes additional wear, and keeps anyone from shifting faster then they deturmined.

All you have to do is remove the valve and bolt the line back together, then re-bleed the system. You can also pull the CDV out and simply drill the hole out to the size of the clutch line and then put it back in. The one Riss and others sell are just stock units that have been drilled out - anyone can do it. This also keeps things looking stock so if anything clutch-wise goes wrong BMW can't see it was modified.

It defintely makes a difference, I did it on my old E46 M3 and will be doing it on my new E92 shortly!

Hope this helps...
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      05-20-2008, 05:30 PM   #10
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Quote:
Originally Posted by hamann330ci View Post
^
Simply remove it. Nothing else. You can bolt the line up directly without the CDV.
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      05-20-2008, 10:59 PM   #11
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Just did the mod today. drilled out the stock unit to the size of th clutch line... MUCH better! Perfect shifts through the gears...
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      05-20-2008, 11:20 PM   #12
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Quote:
Originally Posted by Steveo58 View Post
Just did the mod today. drilled out the stock unit to the size of th clutch line... MUCH better! Perfect shifts through the gears...
hi... can you elaborate?
is there a difference in feel?
does the bite point differ? does the bite point require less pedal travel eg if you need to half clutch?
what do you mean by perfect shifts? does it affect the gear shifting?

thanks for your time in answering my questions.

cheers
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      05-22-2008, 12:28 PM   #13
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Quote:
Originally Posted by edlms View Post
hi... can you elaborate?
is there a difference in feel?
does the bite point differ? does the bite point require less pedal travel eg if you need to half clutch?
what do you mean by perfect shifts? does it affect the gear shifting?

thanks for your time in answering my questions.

cheers
Sure... It doesn't change the bite point or the actual feel at the shift knob, but it improves feel from your left foot on the clutch pedal. With the CDV in I thought it felt on the numb side at the pedal, but with it out you have more of a direct connection.

It also makes the shift from first to second much smoother and easier. It's really quite an easy mod to do, and there is no need to buy the aftermarket parts, just drill the existing one out or simply remove it. Hope this helps...
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      05-22-2008, 04:01 PM   #14
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Here's the DIY
http://www.e90post.com/forums/showthread.php?t=29828
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      05-23-2008, 01:07 AM   #15
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Quote:
Originally Posted by Steveo58 View Post
Sure... It doesn't change the bite point or the actual feel at the shift knob, but it improves feel from your left foot on the clutch pedal. With the CDV in I thought it felt on the numb side at the pedal, but with it out you have more of a direct connection.

It also makes the shift from first to second much smoother and easier. It's really quite an easy mod to do, and there is no need to buy the aftermarket parts, just drill the existing one out or simply remove it. Hope this helps...
thanks...

cheers
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      06-07-2008, 03:12 PM   #16
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anyone have the intsruction in pics of this process odne on a E92 M3 i wanna do it but still not sure how
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      06-07-2008, 09:18 PM   #17
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Quote:
Originally Posted by Mike Benvo View Post
Simply remove it. Nothing else. You can bolt the line up directly without the CDV.
Only issue with that is the dealer could deny clutch or transmission warranty or maintenance coverage if you later have an issue. That's why Zekhausen sells the stealth modified ones.

Frankly, I felt no difference when I had my E46 M3 one removed after warranty.
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      06-11-2008, 04:27 PM   #18
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Quote:
Originally Posted by sejoon85 View Post
Ive tried to contact Riss racing regarding if it will work on the e92 m3. Never got a reply
hahaha good luck with RR. u have to pay them and beg them to get them to talk to you.
Quote:
Originally Posted by Steveo58 View Post
All the CDV valve dose is reduce the internal size of the clutch line, thus limiting the amount of fluid that is able to pass though, as deturmined to be the best rate by BMW. It actually makes the clutch slip slightly, and causes additional wear, and keeps anyone from shifting faster then they deturmined.

All you have to do is remove the valve and bolt the line back together, then re-bleed the system. You can also pull the CDV out and simply drill the hole out to the size of the clutch line and then put it back in. The one Riss and others sell are just stock units that have been drilled out - anyone can do it. This also keeps things looking stock so if anything clutch-wise goes wrong BMW can't see it was modified.

It defintely makes a difference, I did it on my old E46 M3 and will be doing it on my new E92 shortly!

Hope this helps...
awesome post. thanks!
Quote:
Originally Posted by Steveo58 View Post
Sure... It doesn't change the bite point or the actual feel at the shift knob, but it improves feel from your left foot on the clutch pedal. With the CDV in I thought it felt on the numb side at the pedal, but with it out you have more of a direct connection.

It also makes the shift from first to second much smoother and easier. It's really quite an easy mod to do, and there is no need to buy the aftermarket parts, just drill the existing one out or simply remove it. Hope this helps...
again awesome. can u help me do mine?
Quote:
Originally Posted by GregW / Oregon View Post
Only issue with that is the dealer could deny clutch or transmission warranty or maintenance coverage if you later have an issue. That's why Zekhausen sells the stealth modified ones.

Frankly, I felt no difference when I had my E46 M3 one removed after warranty.
on 335 it makes a huge difference. it's worth a shot if it's improves the 1-2 shifts. this + RE ssk that's coming out should make me hella happy
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      06-11-2008, 07:34 PM   #19
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CDV modification

Quote:
Originally Posted by Steveo58 View Post
It's really quite an easy mod to do, and there is no need to buy the aftermarket parts, just drill the existing one out or simply remove it. Hope this helps...
Zeckhausen claims drilling can lead to leaks: http://www.zeckhausen.com/cdv.htm
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      06-18-2008, 02:54 AM   #20
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Quote:
Originally Posted by ///Mantis View Post
hahaha good luck with RR. u have to pay them and beg them to get them to talk to you.

awesome post. thanks!

again awesome. can u help me do mine?

on 335 it makes a huge difference. it's worth a shot if it's improves the 1-2 shifts. this + RE ssk that's coming out should make me hella happy
Some things never change Manits

If you need help feel free to PM me I'm on at 1am to answer questions....any other vendors doing this? Thanks!
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      06-18-2008, 11:32 AM   #21
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      02-02-2014, 10:24 PM   #22
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is there a DIY on this from start to finish?
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