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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Modded cdv question



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      01-21-2013, 07:33 PM   #1
andrew335i
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Modded cdv question

Zeckhausen Racing Modded CDV is the product

I bought this then realized I'm in it for the long haul with my 335i and a modded cdv may not be the best thing for my clutch/tranny.

I've driven stick( all in 3er) for 7 years and know how to properly shift.

The product website actual says this will save some life of my clutch.

The question: will I be limiting the life of my clutch and/or tranny using this? Or if I use it but also drive/shift properly will it assist in making my clutch last longer?

Sorry if its a confusing question.
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      01-21-2013, 07:35 PM   #2
na foo
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Good question. I was under the impression that the CDV was in place to put more of a toll on the clutch versus the transmission.

Yes, the CDV will save the life of your clutch, but my shorten the life of your transmission, lol.
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      01-22-2013, 12:00 PM   #3
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CDV will burn clutch. No CDV will risk shocking the rest of drive. If in doubt what it does, do not do mod.

FYI Mcars have no CDV!
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      01-22-2013, 12:13 PM   #4
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If you are experienced in driving a manual transmission, then removing the CDV shouldn't put too much extra wear on the drivetrain. It is true that the CDV is in place so that if you aren't shifting properly the clutch takes the abuse, not the drivetrain. However, if you know what you're doing driving the car and aren't dropping the clutch trying to drag race, I would think that the extra wear on the drivetrain would be minimal. It's purely anecdotal evidence, but I've had a modified CDV in my car for over three years now and had zero problems. This was the first car I'd driven with a CDV and I hated it.
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      01-22-2013, 12:42 PM   #5
caliguy562
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Keep in mind if it was that detrimental to the transmission, wouldn't you think the M3 would have the delay valve? It's put in place for people who clearly can't drive a manual. No issues with my transmission and I got rid of the cdv years ago.
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      01-22-2013, 01:33 PM   #6
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I've had the Zeckhausen modified CDV for over a year now and it's still the best thing I've done to the car. If you know how to shift and find the CDV annoying, getting rid of it or installing the modified units will bring the joy back. Absolutely no regrets for me.
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      01-22-2013, 02:19 PM   #7
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took it out of my brother e46 m3 and the clutch feel is much better. Its to reduce shock but as long as your not an animal it will be fine. I like the feel better, the cdv cause suck a false pedal feel.
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      01-22-2013, 02:55 PM   #8
andrew335i
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Coolness. Looks like ill do it!
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      01-22-2013, 06:35 PM   #9
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I don't understand why people keep buying this "modified" CDV when all you have to do is pop the restrictor out of your existing CDV. It's the same thing. It literally adds only 5 seconds to the job.
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      01-22-2013, 09:03 PM   #10
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Quote:
Originally Posted by bbbuzzy View Post
I've had the Zeckhausen modified CDV for over a year now and it's still the best thing I've done to the car. If you know how to shift and find the CDV annoying, getting rid of it or installing the modified units will bring the joy back. Absolutely no regrets for me.
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      01-22-2013, 10:03 PM   #11
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Quote:
Originally Posted by caliguy562 View Post
Keep in mind if it was that detrimental to the transmission, wouldn't you think the M3 would have the delay valve? It's put in place for people who clearly can't drive a manual. No issues with my transmission and I got rid of the cdv years ago.
+1

Totally agree with this.
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      01-23-2013, 03:35 AM   #12
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Originally Posted by Figure807 View Post
I don't understand why people keep buying this "modified" CDV when all you have to do is pop the restrictor out of your existing CDV. It's the same thing. It literally adds only 5 seconds to the job.
Please expound. Don't believe that was the case with mine, but am open to hearing how that can be done.
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      01-23-2013, 04:16 AM   #13
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Quote:
Originally Posted by cbad335 View Post
Please expound. Don't believe that was the case with mine, but am open to hearing how that can be done.
All you need is a thin rod - I used a precision screwdriver. Insert into the narrow neck end and push the little restrictor disk out. If you have your original CDV around, try it out. It really is that easy.

Edit: Found the original link for this DIY
http://www.billswebspace.com/BMWCDVModification.htm
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Last edited by Figure807; 01-23-2013 at 04:22 AM.
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      01-23-2013, 02:54 PM   #14
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Quote:
Originally Posted by Figure807 View Post
All you need is a thin rod - I used a precision screwdriver. Insert into the narrow neck end and push the little restrictor disk out. If you have your original CDV around, try it out. It really is that easy.

Edit: Found the original link for this DIY
http://www.billswebspace.com/BMWCDVModification.htm
Cool. Nice find.
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      03-08-2013, 09:24 AM   #15
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The modified CDV (bought or DIY) is only for looks to potentially fool BMW service technicians that you have it still installed (why they would look I don't know). Just take the damn thing out and reconnect the pipe without CDV. Been driving without the CDV pretty much since I got the car and the difference is not that big of a deal I think. Only on very quick shifting during hard acceleration that you will notice the clutch slip for a split second. Mostly noticable between 1st and 2nd and somewhat going into 3rd. This is more annoying than anything else. During regular driving the CDV made no real difference to me during the month I drove with it.

If you believe there is a big difference you should also go with a larger Clutch Stop to shorten the clutch travel to speed up shifting further. I think I appreciate that mod as much, if not more than the CDV delete actually.
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      03-08-2013, 09:41 AM   #16
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Quote:
Originally Posted by johmei View Post
Just take the damn thing out and reconnect the pipe without CDV.
That's how mine is done, I would only use a modified CDV if there were any concerns with voiding my warranty.
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