Clutch Delay Valve (CDV) delete, who has done it?

that_grey_m3 · 03-04-2018, 05:03 PM

Hi all,

So I have been really contemplating deleting/removing the clutch delay valve on our vehicles recently. I feel like I have a very good level on understanding and skill of operating the manual transmission in my e92 m3 already, Ive had it for over 1 year now. Heel toes, rev match, etc have become very easy for me.

...The only thing which throws me off is the inconsistent shifting when trying to shift fast especially from 1st to 2nd gear or 2nd to 3rd. I feel like the grab point of the clutch is rather long but more so unpredictable. Will deleting the CDV be the answer to my solution? Sometimes I can do smooth crisp shifts and other times I find I will have to let the clutch out much slower (especially second half of the clutch travel) in order to execute a smooth shift.

Does anyone have any experience with this mod, are there any disadvantages of doing this? I know its relatively simple to do and so far I've heard very positive results, I just don't want to regret it. The only thing I've heard is it can possibly wear out the clutch more, but I'm not sure about that...thanks so much.

pbonsalb · 03-04-2018, 06:18 PM

There is no clutch delay valve on the E9xM3.

aus · 03-04-2018, 11:40 PM

Ditto pbonsalb.
.

doogee · 03-05-2018, 07:12 AM

You should also look into doing the clutch fan delete.

ItsGary · 03-05-2018, 12:40 PM

Quote:

Originally Posted by doogee

You should also look into doing the clutch fan delete.

Also get your muffler bearings done for more HP

Richbot · 03-05-2018, 01:12 PM

Hoooooooo boy, another common issues for E9x M thread, let's finally get this all in one spot shall we?

- DI pump and injector issue (check if you've had the latest recall done)
- Timing belts can fail
- Nikasil bore liners can cause a lot of oil consumption
- MAF sensors get dirty ALL THE TIME, hello check engine light
- CDV delete, must-have option, delete or the clutch will fail early (note you need two delete kits for the DCT)
- VANOS rattle TIMES FOUR
- Walnut blast the intake ports every 50,000 miles or less if you turn up the boost
- Wastegate issues
- Front sump/rear sump oil compatibility problems
- Secondary and primary cat videos

And that's just the engine/drivetrain stuff, you gotta watch out for subframe tearout and those runflat tires and the air springs going out too

doogee · 03-06-2018, 07:39 AM

I also recommend upgrading to cross drilled brake lines.

94jedi · 03-06-2018, 09:12 AM

Quote:

Originally Posted by doogee

I also recommend upgrading to cross drilled brake lines.

did anyone mention blinker fluid? definitely going to need some of that.

Scharbag · 03-06-2018, 09:17 AM

Unfortunately, you now can buy exhaust fluid. So that standby prank is no longer valid... So many laughs with that one.

But you can still send a guy to buy a box of spark plug gap.

SYT_Shadow · 03-06-2018, 09:18 AM

Quote:

Originally Posted by that_grey_m3

Hi all,

So I have been really contemplating deleting/removing the clutch delay valve on our vehicles recently. I feel like I have a very good level on understanding and skill of operating the manual transmission in my e92 m3 already, Ive had it for over 1 year now. Heel toes, rev match, etc have become very easy for me.

...The only thing which throws me off is the inconsistent shifting when trying to shift fast especially from 1st to 2nd gear or 2nd to 3rd. I feel like the grab point of the clutch is rather long but more so unpredictable. Will deleting the CDV be the answer to my solution? Sometimes I can do smooth crisp shifts and other times I find I will have to let the clutch out much slower (especially second half of the clutch travel) in order to execute a smooth shift.

Does anyone have any experience with this mod, are there any disadvantages of doing this? I know its relatively simple to do and so far I've heard very positive results, I just don't want to regret it. The only thing I've heard is it can possibly wear out the clutch more, but I'm not sure about that...thanks so much.

jokes aside, you may get the biggest benefit from installing the UCP pedal. It provides more consistent application. Lots of people also remove one or two springs from the OEM clutch assembly

EJT86 · 03-06-2018, 10:16 AM

You guys are funny, I’m not as gullible as some and never buy into these fake auto parts. Last week my car was making a noise and I was told my “rod bearings” were failing I said psshhh nice try!

94jedi · 03-06-2018, 10:38 AM

Quote:

Originally Posted by SYT_Shadow

jokes aside, you may get the biggest benefit from installing the UCP pedal. It provides more consistent application. Lots of people also remove one or two springs from the OEM clutch assembly

I think this is one of my next few mods...need to do a little more research first.

elim11 · 03-06-2018, 12:56 PM

Make sure you put in premium VTEC fluid and dont let it run low.

Jokes aside, look into a clutch stop. Best $10 I have ever spent. Takes away all the dead space in the pedal.

e92zero · 03-06-2018, 05:59 PM

clutch stop and UCP pedal, best thing you can do to improve the clutch pedal feel and travel for the M3.

6ixSpd · 03-06-2018, 10:00 PM

Quote:

Originally Posted by Richbot

Hoooooooo boy, another common issues for E9x M thread, let's finally get this all in one spot shall we?

- DI pump and injector issue (check if you've had the latest recall done)
- Timing belts can fail
- Nikasil bore liners can cause a lot of oil consumption
- MAF sensors get dirty ALL THE TIME, hello check engine light
- CDV delete, must-have option, delete or the clutch will fail early (note you need two delete kits for the DCT)
- VANOS rattle TIMES FOUR
- Walnut blast the intake ports every 50,000 miles or less if you turn up the boost
- Wastegate issues
- Front sump/rear sump oil compatibility problems
- Secondary and primary cat videos

And that's just the engine/drivetrain stuff, you gotta watch out for subframe tearout and those runflat tires and the air springs going out too

This triggered my 335i ownership woes. Hard.

Loki Motorsports · 03-08-2018, 11:25 AM

Quote:

Originally Posted by SYT_Shadow

jokes aside, you may get the biggest benefit from installing the UCP pedal. It provides more consistent application. Lots of people also remove one or two springs from the OEM clutch assembly

This. ^^^ I removed one of the clutch springs from the pedal assembly a few months ago. NIGHT/DAY difference. Clutch isn't so soft anymore, which I wanted... And the engagement seems much more predictable and easier to replicate as well. Can't recommend doing this, enough. DIY below.

http://www.m3post.com/forums/showthread.php?t=195777

SYT_Shadow · 03-08-2018, 11:29 AM

Quote:

Originally Posted by Loki Motorsports

This. ^^^ I removed one of the clutch springs from the pedal assembly a few months ago. NIGHT/DAY difference. Clutch isn't so soft anymore, which I wanted... And the engagement seems much more predictable and easier to replicate as well. Can't recommend doing this, enough. DIY below.

http://www.m3post.com/forums/showthread.php?t=195777

I'd best most of the UCP advantage can be gained by just removing the friggin spring

pbonsalb · 03-08-2018, 11:30 AM

And replacing the bushings with delrin or bronze.

Loki Motorsports · 03-08-2018, 11:37 AM

Quote:

Originally Posted by SYT_Shadow

I'd best most of the UCP advantage can be gained by just removing the friggin spring

I haven't had any experience with the UCP assembly personally, but judging simply from the spring removal benefits. I'm obligated to agree with you!

e92zero · 03-10-2018, 01:41 AM

It depends on how sensitive your left leg is. The plastic oem clutch pedal arm does not give the same feedback and 'feel' that the metal UCP clutch pedal provide. The factory bushing also has a lot of play compare to the UCP pedal as one of the poster above pointed out also. I set the UCP to the stiffest (least assist) setting and loved it.

SanFranciscoM3 · 07-15-2022, 07:58 PM

Hey guys, has anyone removed the clutch delay valve with a noticeable improvement? All kidding aside. My 2008 M3 has issues that sound like a clutch delay valve. I know the clutch was changed for 2009. I already did UCP and BMS clutch stop, which helped partially.

Richbot · 07-17-2022, 04:30 PM

Quote:

Originally Posted by Richbot

Hoooooooo boy, another common issues for E9x M thread, let's finally get this all in one spot shall we?

- DI pump and injector issue (check if you've had the latest recall done)
- Timing belts can fail
- Nikasil bore liners can cause a lot of oil consumption
- MAF sensors get dirty ALL THE TIME, hello check engine light
- CDV delete, must-have option, delete or the clutch will fail early (note you need two delete kits for the DCT)
- VANOS rattle TIMES FOUR
- Walnut blast the intake ports every 50,000 miles or less if you turn up the boost
- Wastegate issues
- Front sump/rear sump oil compatibility problems
- Secondary and primary cat videos

And that's just the engine/drivetrain stuff, you gotta watch out for subframe tearout and those runflat tires and the air springs going out too

make sure you check all of these first

03-04-2018, 05:03 PM	#1
that_grey_m3 Second Lieutenant 60 Rep 228 Posts Drives: Space Grey E92 M3 6 spd Join Date: Oct 2017 Location: vancouver iTrader: (0)	Clutch Delay Valve (CDV) delete, who has done it? Hi all, So I have been really contemplating deleting/removing the clutch delay valve on our vehicles recently. I feel like I have a very good level on understanding and skill of operating the manual transmission in my e92 m3 already, Ive had it for over 1 year now. Heel toes, rev match, etc have become very easy for me. ...The only thing which throws me off is the inconsistent shifting when trying to shift fast especially from 1st to 2nd gear or 2nd to 3rd. I feel like the grab point of the clutch is rather long but more so unpredictable. Will deleting the CDV be the answer to my solution? Sometimes I can do smooth crisp shifts and other times I find I will have to let the clutch out much slower (especially second half of the clutch travel) in order to execute a smooth shift. Does anyone have any experience with this mod, are there any disadvantages of doing this? I know its relatively simple to do and so far I've heard very positive results, I just don't want to regret it. The only thing I've heard is it can possibly wear out the clutch more, but I'm not sure about that...thanks so much.
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03-04-2018, 06:18 PM	#2
pbonsalb Lieutenant General 5252 Rep 10,626 Posts Drives: 18 F90 M5, 99 E36 M3 Turbo Join Date: Feb 2011 Location: New England iTrader: (4)	There is no clutch delay valve on the E9xM3.
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03-04-2018, 11:40 PM	#3
aus Major General 892 Rep 9,032 Posts Drives: Odysse Join Date: Jul 2005 Location: Seal Beach, CA iTrader: (10)	Ditto pbonsalb. . __________________ Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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03-05-2018, 07:12 AM	#4
doogee Major 748 Rep 1,256 Posts Drives: '08 M3, '09 328xi Sport Wagon Join Date: Oct 2008 Location: Ancaster, ON, Canada iTrader: (0)	You should also look into doing the clutch fan delete. __________________
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03-05-2018, 01:12 PM	#6
Richbot Major General 2760 Rep 5,483 Posts Drives: Jerez Black E90 Join Date: Sep 2007 Location: STL iTrader: (5)	Hoooooooo boy, another common issues for E9x M thread, let's finally get this all in one spot shall we? - DI pump and injector issue (check if you've had the latest recall done) - Timing belts can fail - Nikasil bore liners can cause a lot of oil consumption - MAF sensors get dirty ALL THE TIME, hello check engine light - CDV delete, must-have option, delete or the clutch will fail early (note you need two delete kits for the DCT) - VANOS rattle TIMES FOUR - Walnut blast the intake ports every 50,000 miles or less if you turn up the boost - Wastegate issues - Front sump/rear sump oil compatibility problems - Secondary and primary cat videos And that's just the engine/drivetrain stuff, you gotta watch out for subframe tearout and those runflat tires and the air springs going out too __________________
	Appreciate 1 SYT_Shadow11496.00 Quote

03-06-2018, 07:39 AM	#7
doogee Major 748 Rep 1,256 Posts Drives: '08 M3, '09 328xi Sport Wagon Join Date: Oct 2008 Location: Ancaster, ON, Canada iTrader: (0)	I also recommend upgrading to cross drilled brake lines. __________________
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03-06-2018, 09:17 AM	#9
Scharbag Colonel 2631 Rep 2,141 Posts Drives: 2011 E92 M3 Join Date: Oct 2017 Location: Victoria iTrader: (0) Garage List 2011 BMW E92 M3 [0.00]	Unfortunately, you now can buy exhaust fluid. So that standby prank is no longer valid... So many laughs with that one. But you can still send a guy to buy a box of spark plug gap. __________________ 2011 E92 M3 - 6MT, ZCP, ZF LSD, ESS G1, Some other goodies...
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03-06-2018, 10:16 AM	#11
EJT86 Brigadier General 2383 Rep 3,732 Posts Drives: 2018 M2 Join Date: Mar 2014 Location: Boston, MA iTrader: (0) Garage List [0.00] 2018 BMW M2 [0.00]	You guys are funny, I’m not as gullible as some and never buy into these fake auto parts. Last week my car was making a noise and I was told my “rod bearings” were failing I said psshhh nice try!
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03-06-2018, 12:56 PM	#13
elim11 Major 424 Rep 1,325 Posts Drives: e90m3 Join Date: Apr 2008 Location: irvine/sf iTrader: (13)	Make sure you put in premium VTEC fluid and dont let it run low. Jokes aside, look into a clutch stop. Best $10 I have ever spent. Takes away all the dead space in the pedal. __________________
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03-06-2018, 05:59 PM	#14
e92zero Captain 212 Rep 875 Posts Drives: 2011 E92 BW Join Date: May 2010 Location: somewhere in US iTrader: (1)	clutch stop and UCP pedal, best thing you can do to improve the clutch pedal feel and travel for the M3.
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03-08-2018, 11:30 AM	#18
pbonsalb Lieutenant General 5252 Rep 10,626 Posts Drives: 18 F90 M5, 99 E36 M3 Turbo Join Date: Feb 2011 Location: New England iTrader: (4)	And replacing the bushings with delrin or bronze.
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03-10-2018, 01:41 AM	#20
e92zero Captain 212 Rep 875 Posts Drives: 2011 E92 BW Join Date: May 2010 Location: somewhere in US iTrader: (1)	It depends on how sensitive your left leg is. The plastic oem clutch pedal arm does not give the same feedback and 'feel' that the metal UCP clutch pedal provide. The factory bushing also has a lot of play compare to the UCP pedal as one of the poster above pointed out also. I set the UCP to the stiffest (least assist) setting and loved it.
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07-15-2022, 07:58 PM	#21
SanFranciscoM3 Private 9 Rep 62 Posts Drives: e92 M3 Join Date: May 2012 Location: San Francisco iTrader: (0)	Hey guys, has anyone removed the clutch delay valve with a noticeable improvement? All kidding aside. My 2008 M3 has issues that sound like a clutch delay valve. I know the clutch was changed for 2009. I already did UCP and BMS clutch stop, which helped partially.
	Appreciate 0 Quote