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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 05-09-2005, 09:24 AM
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tierfreund tierfreund is offline
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CDV on E90 or not

Has somebody figured out wether the E90 has the dreaded CDV or not?
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  #2  
Old 05-27-2005, 07:26 AM
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DZeckhausen DZeckhausen is offline
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Quote:
Originally Posted by tierfreund
Has somebody figured out wether the E90 has the dreaded CDV or not?
It does appear to have a CDV. The BMW part number is 21-52-6-764-872. Unlike the other CDVs I've seen, this one has a plastic body and simply clicks into place. I ordered a couple of them to see if they could be modified. So far, I haven't figured out how to do it without breaking the valve.


E90 CDV



E46 CDV
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CDV deleted

Last edited by DZeckhausen; 05-27-2005 at 07:29 AM.
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  #3  
Old 05-27-2005, 08:06 AM
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tierfreund tierfreund is offline
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If itīs just clipped and input=output, canīt you just take it out and plug in the hydraulics line directly?
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  #4  
Old 06-13-2005, 07:41 PM
djerbaka djerbaka is offline
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Any more info

I am very interested to know if this can just be removed, also.
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  #5  
Old 06-14-2005, 11:46 AM
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Quote:
Originally Posted by djerbaka
I am very interested to know if this can just be removed, also.
It can be removed.
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StopTech 4-wheel big brake upgrade
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CDV deleted
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  #6  
Old 06-14-2005, 11:52 AM
bimmer4me bimmer4me is offline
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Quote:
Originally Posted by DZeckhausen
It can be removed.
How??
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  #7  
Old 06-14-2005, 12:03 PM
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Quote:
Originally Posted by bimmer4me
How??
  1. Use a screwdriver to pry loose the spring clip at the female (wide) end of the CDV and at the end of the fitting the CDV plugs into.
  2. Remove the CDV.
  3. Connect the two loose fittings together.
  4. Push the spring clip on the fitting into place to secure the connection.
  5. Bleed the clutch slave cylinder.
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2012 BMW F30 328i Luxury Line 8-Speed
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2001 BMW E39 540i 6-Speed (Traded-in for F30)
StopTech 4-wheel big brake upgrade
M5 Limited Slip Differential, Front Swaybar
Dinan Stage 3 Suspension, Strut Tower Brace
Rogue Short Shifter, Transmission Mounts
European Dash Conversion
CDV deleted
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  #8  
Old 06-14-2005, 12:14 PM
bimmer4me bimmer4me is offline
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Quote:
Originally Posted by DZeckhausen
  1. Use a screwdriver to pry loose the spring clip at the female (wide) end of the CDV and at the end of the fitting the CDV plugs into.
  2. Remove the CDV.
  3. Connect the two loose fittings together.
  4. Push the spring clip on the fitting into place to secure the connection.
  5. Bleed the clutch slave cylinder.
Can a dealer or independent mechanic do this?
I have no idea what "Bleed the clutch slave cylinder" means (but it does sound cool ).
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  #9  
Old 06-14-2005, 01:09 PM
bjacques bjacques is offline
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Quote:
Originally Posted by DZeckhausen
  1. Use a screwdriver to pry loose the spring clip at the female (wide) end of the CDV and at the end of the fitting the CDV plugs into.
  2. Remove the CDV.
  3. Connect the two loose fittings together.
  4. Push the spring clip on the fitting into place to secure the connection.
  5. Bleed the clutch slave cylinder.
So you're saying that it will not be neccesary to modify the CDV? The device can just be removed, the lines have enough slack to reach, and the fittings are compatible, etc?
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  #10  
Old 06-14-2005, 05:50 PM
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cwsqbm cwsqbm is offline
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Quote:
Originally Posted by bjacques
So you're saying that it will not be neccesary to modify the CDV? The device can just be removed, the lines have enough slack to reach, and the fittings are compatible, etc?
I maybe wrong, but the purpose of a modified CDV is not to have any warranty issues. Dealer sees missing CDV, makes a note, and later down the road maybe your clutch issue isn't covered under warranty.
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  #11  
Old 06-14-2005, 05:58 PM
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Quote:
Originally Posted by bjacques
So you're saying that it will not be neccesary to modify the CDV? The device can just be removed, the lines have enough slack to reach, and the fittings are compatible, etc?
On some platforms, the modified CDV installation is easier than just removing the old CDV becuase some steel lines have to be bent otherwise. On the E46 and E90, you can just move the rubber line over. However, as cwsqbm pointed out, you won't retain the stock appearance if you just take it out and throw it away.
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Dinan Stage 3 Suspension, Strut Tower Brace
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CDV deleted
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  #12  
Old 06-14-2005, 06:08 PM
LarryN LarryN is offline
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I would guess that the e90 CDV is much less restrictive though (but I wouldn't mind experimenting with the bypass for a few weeks). Having both a e46 and e90 330i, I can say the clutch is much better in the e90.

I certainly wouldn't mind a drilled out replacement, if you figure out how to do it, Dave. The installation would be even easier than the e46.
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  #13  
Old 06-22-2005, 05:32 AM
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DZeckhausen DZeckhausen is offline
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Quote:
Originally Posted by LarryN
I would guess that the e90 CDV is much less restrictive though (but I wouldn't mind experimenting with the bypass for a few weeks). Having both a e46 and e90 330i, I can say the clutch is much better in the e90.

I certainly wouldn't mind a drilled out replacement, if you figure out how to do it, Dave. The installation would be even easier than the e46.
The E90 CDV is more restrictive than the traditional metal CDVs. The opening is smaller.

The good news is that I have just perfected a technique for removing the valve mechanism without damaging the plastic body. A few valves had to be sacrificed for the cause, but it works now. I can provide modified E90 CDVs to anyone who wants them.

I only have two now, but I'll be ordering about 30 new valves from Pacific BMW today, so I'll be stocked up in about a week. That's assuming, of course, that there are a large number of E90 CDVs available for purchase. This order may take them by surprise.
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2012 BMW F30 328i Luxury Line 8-Speed
StopTech 4-wheel big brake upgrade

2001 BMW E39 540i 6-Speed (Traded-in for F30)
StopTech 4-wheel big brake upgrade
M5 Limited Slip Differential, Front Swaybar
Dinan Stage 3 Suspension, Strut Tower Brace
Rogue Short Shifter, Transmission Mounts
European Dash Conversion
CDV deleted
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  #14  
Old 06-22-2005, 09:52 AM
Donnalee Donnalee is offline
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D Zeckhausen for you and RHD E90 owners please note that RHD cars have a Different CDV valve, and they are NOT interchangeable
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  #15  
Old 06-22-2005, 10:17 AM
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DZeckhausen DZeckhausen is offline
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Quote:
Originally Posted by Donnalee
D Zeckhausen for you and RHD E90 owners please note that RHD cars have a Different CDV valve, and they are NOT interchangeable
Thanks! I'll look into this and sort it all out.
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2012 BMW F30 328i Luxury Line 8-Speed
StopTech 4-wheel big brake upgrade

2001 BMW E39 540i 6-Speed (Traded-in for F30)
StopTech 4-wheel big brake upgrade
M5 Limited Slip Differential, Front Swaybar
Dinan Stage 3 Suspension, Strut Tower Brace
Rogue Short Shifter, Transmission Mounts
European Dash Conversion
CDV deleted
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  #16  
Old 07-21-2005, 03:29 PM
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DZeckhausen DZeckhausen is offline
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Quote:
Originally Posted by Donnalee
D Zeckhausen for you and RHD E90 owners please note that RHD cars have a Different CDV valve, and they are NOT interchangeable
I've confirmed that there are three different CDVs used on the various E90 platforms sold throughout the world. The good news for us Yanks is that both models sold here (325i and 330i) use the 21-52-6-764-872 valve pictured below. The 325i sold overseas in either left or right hand drive also uses this valve.



I tried to order the other two valves, p/n 21-52-6-764-876 and 21-52-6-765-120, but they are not available for sale in the USA. So I still don't know how they differ from the valve pictured above.

Here is the list of E90 models associated with each CDV type:

21-52-6-764-872
  • EU 325i LHD & RHD
  • EU 330i LHD
  • USA 325i LHD
  • USA 330i LHD

21-52-6-764-876
  • EU 320d LHD & RHD
  • EU 330i RHD

21-52-6-765-120
  • EU 320i LHD & RHD
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------
2012 BMW F30 328i Luxury Line 8-Speed
StopTech 4-wheel big brake upgrade

2001 BMW E39 540i 6-Speed (Traded-in for F30)
StopTech 4-wheel big brake upgrade
M5 Limited Slip Differential, Front Swaybar
Dinan Stage 3 Suspension, Strut Tower Brace
Rogue Short Shifter, Transmission Mounts
European Dash Conversion
CDV deleted
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  #17  
Old 07-22-2005, 12:57 PM
speeedr speeedr is offline
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Cdv

What purpose does the CDV serve?
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  #18  
Old 07-22-2005, 01:29 PM
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DZeckhausen DZeckhausen is offline
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Quote:
Originally Posted by speeedr
What purpose does the CDV serve?
It's there to ruin your driving experience.

But seriously, BMW put it there to reduce the potential for driveline shock if the car is driven by someone without the skill to feather the clutch the way it should be. It's one of those least common denominator things where the rest of us are paying for a few bad eggs out there. Sort of like the stupid bolstered lower dash of the USA model of the E39 5-Series that looks bad and steals lots of knee room, all because we tend to have lower setabelt usage than the rest of the world.

See: http://www.zeckhausen.com/CDV.htm for lots of CDV details
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2012 BMW F30 328i Luxury Line 8-Speed
StopTech 4-wheel big brake upgrade

2001 BMW E39 540i 6-Speed (Traded-in for F30)
StopTech 4-wheel big brake upgrade
M5 Limited Slip Differential, Front Swaybar
Dinan Stage 3 Suspension, Strut Tower Brace
Rogue Short Shifter, Transmission Mounts
European Dash Conversion
CDV deleted
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  #19  
Old 07-22-2005, 06:37 PM
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TigerNY TigerNY is offline
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Quote:
Originally Posted by DZeckhausen
It's there to ruin your driving experience.

But seriously, BMW put it there to reduce the potential for driveline shock if the car is driven by someone without the skill to feather the clutch the way it should be. It's one of those least common denominator things where the rest of us are paying for a few bad eggs out there. Sort of like the stupid bolstered lower dash of the USA model of the E39 5-Series that looks bad and steals lots of knee room, all because we tend to have lower setabelt usage than the rest of the world.

See: http://www.zeckhausen.com/CDV.htm for lots of CDV details

LOL, honestly, i have no idea what a CDV is! And now,I do wanna know .. a total illitrate here when it comes to cars, even tho i have driven the best and the worst cars of the universe ..
So someone please put a lil light on, what it is , what its purpose is, and why it shoud be removed/broken ...

thanks much!
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  #20  
Old 07-22-2005, 06:45 PM
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DZeckhausen DZeckhausen is offline
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Quote:
Originally Posted by TigerNY
LOL, honestly, i have no idea what a CDV is! And now,I do wanna know .. a total illitrate here when it comes to cars, even tho i have driven the best and the worst cars of the universe ..
So someone please put a lil light on, what it is , what its purpose is, and why it shoud be removed/broken ...

thanks much!
If you click on the link I provided in the post you quoted, I think you'll find the answers to just about any question you can think of about the CDV!
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2012 BMW F30 328i Luxury Line 8-Speed
StopTech 4-wheel big brake upgrade

2001 BMW E39 540i 6-Speed (Traded-in for F30)
StopTech 4-wheel big brake upgrade
M5 Limited Slip Differential, Front Swaybar
Dinan Stage 3 Suspension, Strut Tower Brace
Rogue Short Shifter, Transmission Mounts
European Dash Conversion
CDV deleted
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