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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > DIY - E92 CDV (Clutch Delay Valve) Removal



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  DIY - E92 CDV (Clutch Delay Valve) Removal
EvanL
09-13-2006
Hey, just removed the CDV from my 335i today. Very straightforward and much simpler than the CDV removal from my E46 M3. Steps are as follows:

1. Jack the front end up and put it on JACK STANDS. Do not get under a car that is supported by a jack only.

2. Remove the...
  #198  
By HyperM3 on 01-25-2008, 09:26 PM
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Quote:
Originally Posted by Former_Boosted_IS View Post
Got it taken care of. I did it one person, just needed to pump the pedal a few more times.
I stand corrected then. Glad you got it working!
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  #199  
By Bizout77 on 03-03-2008, 07:23 AM
Will this DIY work for an E90?
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  #200  
By STE92VE on 03-03-2008, 07:30 AM
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Quote:
Originally Posted by Bizout77 View Post
Will this DIY work for an E90?
Yes
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  #201  
By LuisBoston on 03-04-2008, 08:06 PM
Can this work on a e90 328xi?
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  #202  
By STE92VE on 03-04-2008, 08:09 PM
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Quote:
Originally Posted by lem144 View Post
Can this work on a e90 328xi?
Yes.
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  #203  
By remydlc on 03-07-2008, 10:39 AM
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Hi Guys,

I just did my CDV replacement yesterday. Wow, I knew I could shift, but BMW made me believe I couldn't lol. My install took me long time because the damn stupid clip gave me hard time down there. my brakes and clutch feel the same, even though some liquid came out of the hose.

So I have a question, Is that something I should be worry about? I know some people have to bleed their clutch and stuff.

TIA
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  #204  
By HyperM3 on 03-07-2008, 10:42 AM
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Quote:
Originally Posted by remydlc View Post
Hi Guys,

I just did my CDV replacement yesterday. Wow, I knew I could shift, but BMW made me believe I couldn't lol. My install took me long time because the damn stupid clip gave me hard time down there. my brakes and clutch feel the same, even though some liquid came out of the hose.

So I have a question, Is that something I should be worry about? I know some people have to bleed their clutch and stuff.

TIA
Nope. If your pedals feel fine then youre alright. For the most part, bleeding the clutch isnt necessary. Ive done 3 and didnt bleed the clutches any time.
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  #205  
By remydlc on 03-07-2008, 10:57 AM
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Quote:
Originally Posted by HyperM3 View Post
Nope. If your pedals feel fine then youre alright. For the most part, bleeding the clutch isnt necessary. Ive done 3 and didnt bleed the clutches any time.
Thanks a lot for your very fast response HyperM3. I am so happy with my car now
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  #206  
By denlin68 on 04-05-2008, 04:34 PM
Quote:
Originally Posted by HyperM3 View Post
Nope. If your pedals feel fine then youre alright. For the most part, bleeding the clutch isnt necessary. Ive done 3 and didnt bleed the clutches any time.
Hey Alex I just got my CDV, I dont trust myself with the install and was wondering if you could help me install it
? Will you be at any meets ? I can meet up with you anytime

Thanks man
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  #207  
By HyperM3 on 04-05-2008, 05:16 PM
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Quote:
Originally Posted by denlin68 View Post
Hey Alex I just got my CDV, I dont trust myself with the install and was wondering if you could help me install it
? Will you be at any meets ? I can meet up with you anytime

Thanks man
Yeah absolutely. PM me for details.
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  #208  
By denlin68 on 04-06-2008, 06:24 PM
If any of you guys dont feel like DIY - HyperM3 is the man to go to. He did it in like 10min and now my car puts the power down much faster

Thanks alex
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  #209  
By HyperM3 on 04-06-2008, 06:28 PM
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Quote:
Originally Posted by denlin68 View Post
If any of you guys dont feel like DIY - HyperM3 is the man to go to. He did it in like 10min and now my car puts the power down much faster

Thanks alex
Happy to help!
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  #210  
By blinkin on 04-08-2008, 05:16 PM
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It might be a stupid question but does the diesels have CDV as well? Cause on the zeckhausenracing there are listed only petrol ones... but why the gearbox would be different in diesel / petrol ?
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  #211  
By BMW_TT on 04-09-2008, 02:31 PM
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just finished deleting the CDV. weird thing is i didn't have anything to bleed out.
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  #212  
By STE92VE on 04-09-2008, 02:32 PM
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Quote:
Originally Posted by BMW_TT View Post
just finished deleting the CDV. weird thing is i didn't have anything to bleed out.
Maybe your BMW is anemic...
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  #213  
By HyperM3 on 04-09-2008, 05:54 PM
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Quote:
Originally Posted by BMW_TT View Post
just finished deleting the CDV. weird thing is i didn't have anything to bleed out.
Ive done 10+ so far without bleeding. If done correctly, you dont have to.
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  #214  
By BMW_TT on 04-09-2008, 06:29 PM
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Quote:
Originally Posted by HyperM3 View Post
Ive done 10+ so far without bleeding. If done correctly, you dont have to.
thats why my dad is the mechanic and im his apprentice
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  #215  
By Gesler on 04-15-2008, 01:10 PM
Hey HyperM3, after reading your comments, I just did the CDV delete yesterday without bleeding. the Clutch pedal was lax initially but after pumping it a few times, it returned to normal consistency. no problems so far. Thanks to EvanL and you!
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  #216  
By theanhdy on 04-17-2008, 11:41 AM
Quote:
Originally Posted by 1Hot135 View Post
hi everyone, i just ordered a 135 and have been surfing around for good modifications to reduce the 0-60. i want to try to compete with corvettes! anyway i found this modification called a clutch delay valve removal on another forum. it is free to do, has anyone tried it? here is the info i found. is this safe to do? does it help 0-60? >>>>>>>>>>>>>>>Tired of paying $30 plus for something you can do for free? I picked up a spare CDV from the wholesale department at my dealer for $5.95. You can also take out the CDV, modify it and replace it for FREE but I wanted to do everything at once while under the car so I spent $5.95 on a spare. I then took the following steps to modify the CDV. Before removal first crimp the rubber line leading to the CDV so you don't lose all you brake fluid. Here's a picture of the CDV before the modification. As you can see the fluid is restricted from flowing through quickly and will therefore slow the engagement of the clutch on fast shifts. Next take a small allen wrench and insert it into the small end of the CDV as shown. With minimal pressure tap the allen wrench and the restrictor will pop right out. Pictured here is the inside of the CDV once popped out. There is nothing else left inside the CDV and it's now guts free. Reinstall the modified CDV. Fluid is now free to flow through the valve unobstructed and you will notice the difference right away. If you reinstall the CDV quickly enough you may not need to bleed the lines but it's a good idea anyway. Since I did this mod months ago I don't have actual step-by-step instructions on how to do it but following is a link to the best DIY CDV replacement I've seen: http://www.billswebspace.com/BMWCDVMod.htm. Without the guts in your stock CDV it looks identical inside to the Zeckhausen modified CDV in this DIY.

>>


Quote:
Originally Posted by Rephlex View Post



Part number



21526764872



See here - REALOEM this is for the 130i but I assure you it is the same part.
....
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  #217  
By MusclezMarinara on 02-15-2009, 02:06 AM
has anyone had a problem with the factory piece in place?
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  #218  
By STE92VE on 02-15-2009, 10:02 AM
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No problems here with the CDV left in place.
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  #219  
By mikeokimster on 04-09-2009, 09:41 PM
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I just did this mod. The longest part was cutting wood to allow the car to fit a GM jack underneath. The mod was very straight foward.

Step:
1. jack up the car
2. remove the (7) 8mm screws that hold the under panel.
3. Rotate the underpanel until the clip is aligned with the slot so that the panel can be removed.
4. Locate the CDV
5. Clamp or vise down the rubber tube to prevent leakage of brake fluid
6. Rotate the CDV so that you can get a screwdriver to pop out the clip closest to the rubber line
7. take a very very skinny screw driver and push in one of the bases of the clip and the clip should pop out from the other side with super ease. It was hard to get a flat head underneath the bent part of the clip like I did in step 6 so I tried this out.
8. Pop in the new unit and pop the clamps in place.

Review:
Upon initial drve I really didn't notice a difference to tell you guys the truth. After some spirited driving I realized there was a drastic improvement. I just was applying the driving techniques with the stock CDV at first(to counter the notchiness) making it worse.

My biggest improvements were from gears 2-6. 1-2 is still somewhat jerky for me, perhaps due to the BMW ssk. I had a few opportunities to take 1st hard to 7k and then shift quickly to 2nd. In my previous setup, I would feel a big jerk/clutch slip upon transitioning into 2nd. Today was different... The clutch just GRABBED and there was no hessitation. It was beautiful!

It is unreal how smooth the gear shift transitions are now. I had moments where I would hate my car on those days that I wasn't on to of my shifting. This is how I should have felt from day 1 of ownership.
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