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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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Drives: 1988 M3, 1990 M3, 1998 M3/4
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Garage List 1998 BMW M3/4 [10.00]
2011 BMW M3 Sedan [9.28] 1988 BMW M3 [9.40] 1990 BMW M3 [10.00] 2008 BMW 135i - sold [0.00] 2003 BMW M3 - sold [0.00] |
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, 08:01 PM | #15 |
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CDV Part number confirmation
I just looked up the CDV part number for the 135i specifically, and you are correct.
21 52 6 764 872 Retail according to my catalog is $8.30 -Gordon |
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04-16-2008, 08:39 PM | #16 |
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Nice. Should make it easier to bark the tires going into 2nd.
As for competing with vettes.... you're going to need more than this mod, although a stock 135i can handle a stock C4 vette pretty easily, except ZR1's.
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04-16-2008, 09:26 PM | #17 |
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Yeah also a stock c5. They did naught to 60 in about 4.8, the one does it in 4.7ish. With a chip and some other mods you will have a lot of fun.
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04-17-2008, 03:49 PM | #20 | |
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Quote:
So you are saying that you getting an automatic just because you think it gets to 60 faster.. There must be more to it then that.....there must be. And why do you think that anyway. The 135i doesnt have launch control I dont think, so a MT car will have a better launch than the AT car. |
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04-17-2008, 04:17 PM | #21 | |
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im sorry but if were to get an automatic car i would pick a C350 Benz nice and lux. Not sport the auto is not faster then the MT for the bmw |
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