Clutch delay valve?

roush28 · 11-29-2009, 11:53 AM

Any thoughts on pro's & con's of replacing the clutch delay valve with amodified one? I really hate the delay between shifts. Is it hard to install? Who could I have do it? BMW? What's a fair labor charge?

Lucky1 · 11-29-2009, 11:55 AM

Quote:

Originally Posted by roush28

Any thoughts on pro's & con's of replacing the clutch delay valve with amodified one? I really hate the delay between shifts. Is it hard to install? Who could I have do it? BMW? What's a fair labor charge?

What's a clutch delay valve for those of us who don't know? Is this for automatics?

ChrisK · 11-29-2009, 01:09 PM

Been discussed a million times.

TP 135i · 11-29-2009, 01:26 PM

Quote:

Originally Posted by ChrisK

Been discussed a million times.

+1000

SEARCH............."Clutch Delay Valve" or "CDV"

JimD · 11-29-2009, 07:12 PM

It is an obstruction in the hydraulic line for the clutch of a manual transmission BMW. It keeps the clutch from operating as abruptly as it otherwise would. I think it helps smooth out shifts nicely and apparently BMW likes it to minimize damage to the clutch from abrupt operation. Some people think they can shift a little faster without it. I think my bimmer shifts smoother than any of the many other manuals I have driven over the years and I suspect this valve is one reason that is the case.

Jim

123D-M · 11-30-2009, 02:52 AM

The clutch delay valve is actually designed to cause more damage to the clutch, not less. In doing so it prevents damage to the rest of the drivetrain such as the gearbox. The above comment is inaccurate.

When you drop the clutch very abruptly as you would when launching the car or driving in an 'enthusiastic' manner the CDV essentially vetoes that by not allowing the clutch plates to clamp shut instantly, thus slipping the clutch a little and avoiding shock to the drivetrain.

Depending how often you drive 'enthusiastically' this will significantly shorten the life of the clutch. It also removes a lot of feeling from the clutch and makes it feel wooden and imprecise in my opinion. And by removing total control of the clutch action from the driver it does make it difficult to modulate gear changes, particularly at slow speeds and particularly from 1st to 2nd.

I am not a fan.

larryn · 11-30-2009, 07:35 AM

Quote:

Originally Posted by TP 135i

+1000

SEARCH............."Clutch Delay Valve" or "CDV"

I agree. Wouldn't it be nice if, when even given what to search for, that they didn't add to the thread beyond that? I think it makes people lazy, because even though they are given info on what to search for, somebody undoubtedly come along and reposts the information in that thread anyway.

TP 135i · 11-30-2009, 07:42 AM

And I wasn't trying to be mean with my direction/advice.
It's just that, knowing the ton of discussions on the CDV could not be duplicated here and if the OP wanted the answers to his/her questions that the search and past threads would be the most thorough way to get them.

larryn · 11-30-2009, 07:49 AM

Totally agree. I don't think there's anything wrong with saying that it's been talked about (a lot) before, and leave it at that. You even went the extra yardage to give search terms. No need to replicate entire discussion threads over and over.

Mike@N54Tuning.com · 11-30-2009, 08:09 AM

The CDV is the best mod for the price on MT cars

At 20.00 bux you can't go wrong. Install is simple but you need a lift to do it easily, so I had mine done at a local shop for 25bux I believe. Should take only 15min..

Mike

bmw13 · 11-30-2009, 09:22 AM

and when you go to the shop mike, what do you ask them?
i want you to bleed out my clutch and replace my cdv? am i going to cause some lifted brows when i ask that?

Mike@N54Tuning.com · 11-30-2009, 07:17 PM

Quote:

Originally Posted by bmw13

and when you go to the shop mike, what do you ask them?
i want you to bleed out my clutch and replace my cdv? am i going to cause some lifted brows when i ask that?

If you are going to an independent shop ask them to replace the CDV with the one you give them. ITs not hard

If they can't do it for you or have no idea of what you are talking about then its time to find a new shop.

Mike

deamon32 · 11-30-2009, 09:25 PM

Search...

Then DO IT, its that awesome

bRi-135i · 12-09-2009, 08:06 AM

Quote:

Originally Posted by Mike@N54Tuning.com

The CDV is the best mod for the price on MT cars

At 20.00 bux you can't go wrong. Install is simple but you need a lift to do it easily, so I had mine done at a local shop for 25bux I believe. Should take only 15min..

Mike

i've been looking for a DIY, but i can't seem to find it. Do you know where, if so ,can you send me the link. If not i guess i'll just go find a shop.

escobar929 · 12-09-2009, 08:42 AM

Quote:

Originally Posted by bRi-135i

i've been looking for a DIY, but i can't seem to find it. Do you know where, if so ,can you send me the link. If not i guess i'll just go find a shop.

you must have not looked that hard, i just searched "CDV DIY" and this came up
http://www.1addicts.com/forums/showt...hlight=CDV+DIY

Lester · 12-09-2009, 09:01 AM

The DIY gotcha is making sure you don't let the master cylinder go empty.

larryn · 12-09-2009, 09:37 AM

Quote:

Originally Posted by Lester

The DIY gotcha is making sure you don't let the master cylinder go empty.

Very true, but you'd have to let the fluid pour out for that to happen. I definitely lost some fluid doing that DIY, but it was fairly inconsequential to the fluid level in the reservoir. I think the main reason for the fluid loss was having a DSLR in one hand.

AtomiK · 12-09-2009, 09:46 AM

Quote:

Originally Posted by Mike@N54Tuning.com

The CDV is the best mod for the price on MT cars

At 20.00 bux you can't go wrong. Install is simple but you need a lift to do it easily, so I had mine done at a local shop for 25bux I believe. Should take only 15min..

Mike

Does the $25 bucks include the installation and bleeding the clutch? I ask because a shop quoted me $145 to replace the CDV with a modified one and to bleed the clutch.

IDBMW · 12-09-2009, 10:31 AM

I think $145 is a little steep. It took me about ½ hour total but you need ramps of jack stands.

larryn · 12-09-2009, 12:37 PM

$145!!! Yikes. I did mine in less than an hour, including taking all of the pics and writing wrench sizes and number of bolts, etc... for the DIY.

With a lift, it's a 15 minute job, since you do not need to bleed anything, if you are the least bit careful.

335xiRT1 · 12-09-2009, 05:10 PM

I just did my CDV with a modified one on the 135, the shifting now is some much better and faster.
Deff. worth doing, install time only took about 30 minutes from start to finish.

I would deff. bleed it. i clamped the line no fluid leaked out, and when i bleed it air came out, cause of the new CDV has air in it when installed, takes an extra 3 minutes.
excellent mod, wish i did it when i had my 335xi for 2 years.

escobar929 · 12-09-2009, 05:13 PM

^did you buy a modified one or just modified the stock one?

11-29-2009, 11:53 AM	#1
roush28 New Member 3 Rep 5 Posts Drives: 2010 135i Join Date: Nov 2009 Location: abq nm iTrader: (0)	Clutch delay valve? Any thoughts on pro's & con's of replacing the clutch delay valve with amodified one? I really hate the delay between shifts. Is it hard to install? Who could I have do it? BMW? What's a fair labor charge?
	Appreciate 0 Tweet Quote

11-29-2009, 01:09 PM	#3
ChrisK Major General 4449 Rep 7,594 Posts Drives: '19 M2C Join Date: Jun 2007 Location: Chicagoland iTrader: (7) Garage List 2019 BMW M2C [7.00] 2015 Porsche Macan S [0.00]	Been discussed a million times.
	Appreciate 0 Quote

11-29-2009, 07:12 PM	#5
JimD Brigadier General 368 Rep 3,547 Posts Drives: 128i convertible Join Date: Apr 2009 Location: Lexington, SC iTrader: (0)	It is an obstruction in the hydraulic line for the clutch of a manual transmission BMW. It keeps the clutch from operating as abruptly as it otherwise would. I think it helps smooth out shifts nicely and apparently BMW likes it to minimize damage to the clutch from abrupt operation. Some people think they can shift a little faster without it. I think my bimmer shifts smoother than any of the many other manuals I have driven over the years and I suspect this valve is one reason that is the case. Jim __________________ 128i Convertible, MT, Alpine White, Black Top, Taupe Leatherette, Walnut, Sport Ordered 5/22/09, Completed 6/4/09, At Port 6/9/09, On the Georgia Highway 6/13/09, Ship Arrived Charleston 6/24/09 at 10pm, PCD 7/21/09
	Appreciate 0 Quote

11-30-2009, 02:52 AM	#6
123D-M Captain 32 Rep 930 Posts Drives: BMW 123d M-Sport Coupe Join Date: Jul 2008 Location: Madrid, Spain iTrader: (0) Garage List 1965 Citroen DS19 P ... [0.00] 2009 123D M-Sport C ... [10.00] 2009 Mazda6 [0.00]	The clutch delay valve is actually designed to cause more damage to the clutch, not less. In doing so it prevents damage to the rest of the drivetrain such as the gearbox. The above comment is inaccurate. When you drop the clutch very abruptly as you would when launching the car or driving in an 'enthusiastic' manner the CDV essentially vetoes that by not allowing the clutch plates to clamp shut instantly, thus slipping the clutch a little and avoiding shock to the drivetrain. Depending how often you drive 'enthusiastically' this will significantly shorten the life of the clutch. It also removes a lot of feeling from the clutch and makes it feel wooden and imprecise in my opinion. And by removing total control of the clutch action from the driver it does make it difficult to modulate gear changes, particularly at slow speeds and particularly from 1st to 2nd. I am not a fan. __________________ 2009 123D Coupe \| Sedona Red \| Black Boston Leather \| Brushed Aluminium Trim \| Tinted Windows \| M-Sport Package \| 6M \| Comfort Access \| Heated Seats \| Navigation \| Park Distance Front & Rear \| USB \| Bluetooth \| Voice Control \| Efficient Dynamics \| Rain & Light Sensors \| Xenon Lights My blog: http://urbanemusings.wordpress.com/
	Appreciate 0 Quote

11-30-2009, 07:42 AM	#8
TP 135i Major 28 Rep 1,340 Posts Drives: 2008 135i SGM MT Join Date: Nov 2007 Location: Finksburg, Maryland iTrader: (0) Garage List 1995 Acura Integra SE [0.00] 2008 BMW 135i [0.00] 2006 Porsche Cayman S [0.00] 1999 Toyota 4-Runner [0.00]	And I wasn't trying to be mean with my direction/advice. It's just that, knowing the ton of discussions on the CDV could not be duplicated here and if the OP wanted the answers to his/her questions that the search and past threads would be the most thorough way to get them. __________________ 2008 135i SGM
	Appreciate 0 Quote

11-30-2009, 07:49 AM	#9
larryn Lieutenant General 2146 Rep 10,176 Posts Drives: '97 332ti, '21 X5 45e, '16 GT4 Join Date: May 2005 Location: Seattle iTrader: (2)	Totally agree. I don't think there's anything wrong with saying that it's been talked about (a lot) before, and leave it at that. You even went the extra yardage to give search terms. No need to replicate entire discussion threads over and over.
	Appreciate 0 Quote

11-30-2009, 08:09 AM	#10
Mike@N54Tuning.com Joint Chiefs of Staff 4912 Rep 115,980 Posts Drives: 2007 335i, 2015 M3 Join Date: Dec 2008 Location: N54tuning.com iTrader: (89)	The CDV is the best mod for the price on MT cars At 20.00 bux you can't go wrong. Install is simple but you need a lift to do it easily, so I had mine done at a local shop for 25bux I believe. Should take only 15min.. Mike
	Appreciate 0 Quote

11-30-2009, 09:22 AM	#11
bmw13 Captain 102 Rep 677 Posts Drives: 1M - GIAC:S2 Join Date: Jul 2009 Location: Boca Raton, FL iTrader: (0)	and when you go to the shop mike, what do you ask them? i want you to bleed out my clutch and replace my cdv? am i going to cause some lifted brows when i ask that? __________________ Follow my car/ life via Instagram @rdauito 2011 E82 1M #215 of 740 http://www.1addicts.com/forums/showthread.php?t=877009
	Appreciate 0 Quote

11-30-2009, 09:25 PM	#13
deamon32 First Lieutenant 14 Rep 395 Posts Drives: 135i Join Date: Apr 2008 Location: Costa Mesa iTrader: (1)	Search... Then DO IT, its that awesome __________________ LeMans 135i ///M-sport 6MT
	Appreciate 0 Quote

12-09-2009, 09:01 AM	#16
Lester Brigadier General 295 Rep 3,350 Posts Drives: Join Date: Oct 2007 iTrader: (0)	The DIY gotcha is making sure you don't let the master cylinder go empty.
	Appreciate 0 Quote

12-09-2009, 10:31 AM	#19
IDBMW Captain 41 Rep 825 Posts Drives: 2019 X3 M40i Join Date: Mar 2008 Location: Boise, ID iTrader: (0)	I think $145 is a little steep. It took me about ½ hour total but you need ramps of jack stands. __________________ 2019 X3 M40i - Black Sapphire Metallic - Mocha Lather - 21" 718M wheels - Every option except Sun Shade
	Appreciate 0 Quote

12-09-2009, 12:37 PM	#20
larryn Lieutenant General 2146 Rep 10,176 Posts Drives: '97 332ti, '21 X5 45e, '16 GT4 Join Date: May 2005 Location: Seattle iTrader: (2)	$145!!! Yikes. I did mine in less than an hour, including taking all of the pics and writing wrench sizes and number of bolts, etc... for the DIY. With a lift, it's a 15 minute job, since you do not need to bleed anything, if you are the least bit careful.
	Appreciate 0 Quote

12-09-2009, 05:10 PM	#21
335xiRT1 Captain 47 Rep 693 Posts Drives: 2007 335i Join Date: Oct 2008 Location: long island iTrader: (14)	I just did my CDV with a modified one on the 135, the shifting now is some much better and faster. Deff. worth doing, install time only took about 30 minutes from start to finish. I would deff. bleed it. i clamped the line no fluid leaked out, and when i bleed it air came out, cause of the new CDV has air in it when installed, takes an extra 3 minutes. excellent mod, wish i did it when i had my 335xi for 2 years.
	Appreciate 0 Quote

12-09-2009, 05:13 PM	#22
escobar929 Brigadier General 154 Rep 4,528 Posts Drives: M2 CS Join Date: Aug 2009 Location: Hollywood, FL iTrader: (14) Garage List 2020 M2 CS [10.00] 2020 M240i [0.00]	^did you buy a modified one or just modified the stock one?
	Appreciate 0 Quote