BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

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      04-14-2008, 03:43 PM   #1
1Hot135
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free clutch modification (CDV)

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.
>>
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      04-14-2008, 03:49 PM   #2
Harold
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Search around ("clutch delay valve" or "CDV"), you'll find plenty of discussions about this mod already

Welcome to the site.
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      04-14-2008, 04:03 PM   #3
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A certian online vendor that charges $30 a pop for the gutted one is going to put a hit out on you for letting the cat out of the bag!
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      04-14-2008, 04:05 PM   #4
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Quote:
Originally Posted by FreeBMW View Post
A certian online vendor that charges $30 a pop for the gutted one is going to put a hit out on you for letting the cat out of the bag!




The new best MOD for NO MONEY
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      04-14-2008, 04:57 PM   #5
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Do you happen to have the bmw part number for that fitting? Having one to modify before you tear into the car sounds like a very good idea. thanks
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      04-14-2008, 06:28 PM   #6
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wow this is great.. too bad for all those guys that spent $30 on the mod
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      04-14-2008, 08:01 PM   #7
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that's cool!!! So it's only a $6 part from the dealer? I may just pick one up and modify it. We were talking in another thread about drilling the thing out, but this is even better!!!!!!
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      04-14-2008, 10:12 PM   #8
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:smile:I guess i can put my drill away....:biggrin:
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      04-14-2008, 11:40 PM   #9
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Great info, I had read about that one some where too. But it really works huh? Guess we will do that one as well!

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      04-15-2008, 01:15 AM   #10
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I've done this too and it works.

1Hot135 did you previously own an R32??

EDIT: Just checked your site some more. Loved your R32 and fitted the rear triangulated brace to my Golf after seeing yours! 1-series walks all over the Golf I don't miss it.
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      04-15-2008, 07:52 AM   #11
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i still own my golf... waiting on my 1... i'm dying here. nice write up... looks like this might be something needed to play with to control launching the car the best it can.
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      04-15-2008, 10:03 PM   #12
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WOW that is awesome!
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      04-16-2008, 11:44 AM   #13
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Does anyone know the part number?
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      04-16-2008, 12:37 PM   #14
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Quote:
Originally Posted by NY SLC 93 View Post
Does anyone know the part number?
21526764872

See here - REALOEM this is for the 130i but I assure you it is the same part.
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      04-16-2008, 02:20 PM   #15
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i also just confirmed part number with parts counter guru Colin B @ savage BMW:

21-52-6-764-872 $8.30

this is an awesome post by the OP! these restricters are like the ones installed in the shower head units, i normally always popped those out for higher water flow, never thought this cdv was built the same way...
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      04-28-2008, 05:42 PM   #16
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i just received my CDV in the mail. and i popped out the restricter with an allen wrench. worked just like he said it would. it took more force than i thought it would to pop out the middle piece. great mod. thanks for the heads up.
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      04-28-2008, 07:01 PM   #17
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i've read you should bleed the clutch when installing this.
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      04-29-2008, 04:07 AM   #18
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Will engagement be even further improved by enlarging the hole?
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      04-29-2008, 08:02 AM   #19
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I have my modified CDV, but I still haven't had time to replace it.
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      05-13-2008, 09:39 AM   #20
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where did you order the oem one from?
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      05-13-2008, 10:22 AM   #21
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My local dealership.
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      05-13-2008, 12:40 PM   #22
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Nice to see this isn't like the metal one used on the E36, and E46 that required drilling.
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