Anyone do CDV (Clutch Delay Valve) Mod??

rawedge2 · 04-27-2008, 10:46 PM

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..

sayemthree · 04-27-2008, 11:16 PM

dont knwo but it seemed a big deal inthe e46 M3 - I never did it - the car shifted fine for me.

SS32 · 04-28-2008, 05:54 AM

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.

sejoon85 · 04-28-2008, 11:14 AM

Ive tried to contact Riss racing regarding if it will work on the e92 m3. Never got a reply

BPMSport · 05-01-2008, 12:22 AM

Yes, I removed it yesterday. I like it much better without it.

rawedge2 · 05-16-2008, 05:35 PM

did you simply remove, or did you order a replacement part.. if so which one...???

SnowsM3 · 05-16-2008, 06:03 PM

Quote:

Originally Posted by Mike@ESSTuning

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!

hamann330ci · 05-17-2008, 01:47 AM

Quote:

Originally Posted by rawedge2

did you simply remove, or did you order a replacement part.. if so which one...???

^

Steveo58 · 05-17-2008, 07:00 PM

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...

BPMSport · 05-20-2008, 05:30 PM

Quote:

Originally Posted by hamann330ci

^

Simply remove it. Nothing else. You can bolt the line up directly without the CDV.

Steveo58 · 05-20-2008, 10:59 PM

Just did the mod today. drilled out the stock unit to the size of th clutch line... MUCH better! Perfect shifts through the gears...

edlms · 05-20-2008, 11:20 PM

Quote:

Originally Posted by Steveo58

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

Steveo58 · 05-22-2008, 12:28 PM

Quote:

Originally Posted by edlms

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...

ChinoOrtega · 05-22-2008, 04:01 PM

Here's the DIY
http://www.e90post.com/forums/showthread.php?t=29828

edlms · 05-23-2008, 01:07 AM

Quote:

Originally Posted by Steveo58

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

xxo0oxx · 06-07-2008, 03:12 PM

anyone have the intsruction in pics of this process odne on a E92 M3 i wanna do it but still not sure how

GregW / Oregon · 06-07-2008, 09:18 PM

Quote:

Originally Posted by Mike Benvo

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.

!Xoible · 06-11-2008, 04:27 PM

Quote:

Originally Posted by sejoon85

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

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

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

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

GregW / Oregon · 06-11-2008, 07:34 PM

Quote:

Originally Posted by Steveo58

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

Riss Racing · 06-18-2008, 02:54 AM

Quote:

Originally Posted by ///Mantis

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!

!Xoible · 06-18-2008, 11:32 AM

^^^

charlie style communication aye?

Time Lord · 02-02-2014, 09:24 PM

is there a DIY on this from start to finish?

04-27-2008, 10:46 PM	#1
rawedge2 First Lieutenant 80 Rep 368 Posts Drives: 05 STI - 08 M3 Join Date: Dec 2007 Location: long island iTrader: (1)	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
sayemthree Major General 657 Rep 5,446 Posts Drives: ‘20 X3mC ‘20 Raptor ‘04 X3 6mt Join Date: Aug 2007 Location: usa so cal , AZ iTrader: (0)	dont knwo but it seemed a big deal inthe e46 M3 - I never did it - the car shifted fine for me. __________________ Fore Sale Rare 6 speed manual X3 3.oi silver over grey. PM me
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04-28-2008, 05:54 AM	#3
SS32 Major 206 Rep 1,427 Posts Drives: 2008 M3 Join Date: May 2007 Location: Raleigh, NC iTrader: (0)	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. __________________ V1 DIY - Blinder M45 DIY - Exhaust Cutouts - Removed Clutch Pedal Spring DIY - Fiamm Air Horns
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04-28-2008, 11:14 AM	#4
sejoon85 Captain 27 Rep 683 Posts Drives: AW e92 m3 Join Date: Sep 2007 Location: Vancouver iTrader: (1)	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
BPMSport BimmerPost Supporting Vendor 3592 Rep 7,300 Posts Drives: 2x Harrop E90 M3, E92 M3, E39 Join Date: Apr 2008 Location: SoCal iTrader: (9) Garage List 2000 BMW M5 [0.00] 1990 BMW 735i Turbo [0.00] 2008 BMW M3 [7.50] 2015 BMW M3 [0.00] 2015 BMW M5 [0.00]	Yes, I removed it yesterday. I like it much better without it.
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05-16-2008, 05:35 PM	#6
rawedge2 First Lieutenant 80 Rep 368 Posts Drives: 05 STI - 08 M3 Join Date: Dec 2007 Location: long island iTrader: (1)	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
Steveo58 -Steveo- 34 Rep 201 Posts Drives: 2008 M3 Join Date: May 2008 Location: Irvine, CA iTrader: (0)	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... __________________ -Steveo-
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05-20-2008, 10:59 PM	#11
Steveo58 -Steveo- 34 Rep 201 Posts Drives: 2008 M3 Join Date: May 2008 Location: Irvine, CA iTrader: (0)	Just did the mod today. drilled out the stock unit to the size of th clutch line... MUCH better! Perfect shifts through the gears... __________________ -Steveo-
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05-22-2008, 04:01 PM	#14
ChinoOrtega Captain 54 Rep 604 Posts Drives: 991 C2S Join Date: Apr 2007 Location: Guatemala iTrader: (0)	Here's the DIY http://www.e90post.com/forums/showthread.php?t=29828
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06-07-2008, 03:12 PM	#16
xxo0oxx Private 3 Rep 52 Posts Drives: m3 e92 Join Date: May 2008 Location: uae- dubai iTrader: (0)	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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06-18-2008, 11:32 AM	#21
!Xoible Banned 1016 Rep 46,010 Posts Drives: .... Join Date: Nov 2006 Location: . iTrader: (4) Garage List 2008 M3 [4.00] 2007 335i [9.00] 2008 528i [8.00] 2006 Infiniti - G35 ... [8.00]	^^^ charlie style communication aye?
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02-02-2014, 09:24 PM	#22
Time Lord BimmerPost Supporting Vendor 136 Rep 696 Posts Drives: 2018 F80 ZCP Join Date: Mar 2011 Location: NW Florida iTrader: (5)	is there a DIY on this from start to finish? __________________ 2018 F80 ZCP
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