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04-14-2008, 03:43 PM | #1 |
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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, 04:05 PM | #4 |
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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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04-15-2008, 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, 10:03 PM | #12 |
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WOW that is awesome!
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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, 10:22 AM | #21 |
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My local dealership.
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