[swheeler]

Man, I wish I had done that when I first got the car. I really did want to wait till it was off extended warranty. What a nice change.

[CJ421]

Good decision. I found after I did this that I had become accustomed to the CDV; I realized I was subconsciously disengaging the clutch at the very end without feeling for the engagement (the flywheel and clutch still engage at the same speed w/ the CDV no matter how fast you release the clutch, so you can't feel/control when they connect). Once I had the ability to directly modulate that, I was forced to become a bit more precise.

[FAM3]

Are there not fake CDV mods as well? So it won't void warranty?

[Eric335]

can someone explain this mod to me? i would do anything to improve my shifting experience lol

[jeremicium]

http://www.e90post.com/forums/showthread.php?t=591642

[Three_thirty_I]

Hmm, since I bought mine, been thinking about doing this! Apparently the 335i manual guys don't seem to like this mod, at least that's what I've heard! Over the years I have gotten used to the feel (or lack) of the CDV clutch - most of the time my gear changes are smooth and consistent, but it still does catch me out every now and again, especially when trying to change gears a bit too quickly, which is where the CDV is of course most severe!

There is a proper modified CDV that one can fit that looks like the OEM part rather than removing it that it is too obvious, but one thing to consider once this has been done, you have direct control over the clutch and as such, much easier to break things! Just bear that in mind - not that the CDV prevents damage, but does prevent very sudden clutch actions!

The other problem that goes hand in hand with the CDV is the slightly dull throttle response which is why I have not done the CDV delete - then again, maybe having a predictable clutch with a slightly unpredictable throttle is better than both being unpredictable!

What other differences did you notice after this mod though?

[CJ421]

CDV = hydraulically induced clutch slippage. It's impossible to get 100% smooth shifts with it. I found that moving from a standstill was a pain with the CDV (realized after I had it removed). And shifting at high speeds, I always got a slight bump.

The current M3 does not have the CDV, so that says something. If you know how to drive standard, you don't need the CDV.

[swheeler]

Three_thirty_i, the difference is simply predictable clutch engagement. It engages when you want it to instead of through the delay. If some people are experiencing a dull throttle response, it is simply because they do not know how to drive a manual. CDV has absolutely nothing to do with throttle except it acts to slip the clutch.

[jphughan]

Originally Posted by CJ421

The current M3 does not have the CDV, so that says something. If you know how to drive standard, you don't need the CDV.

Funny that you mention this. I had a chance to talk to Matt Russell (M Brand Manager for BMWNA) at an M5/M6 unveiling at BMW of Austin and he said that "Some M3s do have a CDV." Unfortunately he wouldn't elaborate on that even though I pressed him a few times, and normally I just write that type of comment off as uninformed talk from a branding guy, but at the event it was abundantly clear that Matt knew what he was talking about, and not just about the M5/M6. So now I'm wondering if M3s of certain body styles or produced within a certain date range have them, or maybe all of them have a CDV but it's far less intrusive than the series model version?

[Three_thirty_I]

Originally Posted by swheeler

Three_thirty_i, the difference is simply predictable clutch engagement. It engages when you want it to instead of through the delay. If some people are experiencing a dull throttle response, it is simply because they do not know how to drive a manual. CDV has absolutely nothing to do with throttle except it acts to slip the clutch.

Okay, that's good to hear! My car's just about to enter the world of being out of motorplan, so think this will be my first proper mod!

Only drive manual vehicles and never said that there was any direct correlation between the throttle and clutch feel. With regards to the throttle, I am talking mostly about the adaptations and drive-by-wire character. Have gotten used to it, but still doesn't feel as direct as most other cars - even my manual diesel pickup has a more responsive throttle, of course further helped by the massive diesel torque from idle speed!

[dcat151]

CDV delete is a must-do mod. It improves the driving experience immensely.

Throttle response is not great compared to other cars I've owned, but you get used to it.

[Three_thirty_I]

Originally Posted by dcat151

CDV delete is a must-do mod. It improves the driving experience immensely.

Throttle response is not great compared to other cars I've owned, but you get used to it.

Thanks! Yep, must get this done then!

[El Cheapo Loco]

Originally Posted by dcat151

CDV delete is a must-do mod. It improves the driving experience immensely.

Throttle response is not great compared to other cars I've owned, but you get used to it.

I agree. Recently got this done and now must unlearn the muscle memory developed from years of CDV. That's why this should be done right after getting the car.

[Lou2]

Anyone have any problems with this mod. Anything break as a result?

I occasionally have problems engaging smoothly and would love to fix this...just dnt want to have problems down the road.

[desertfx41]

Originally Posted by elcheapoloco

I agree. Recently got this done and now must unlearn the muscle memory developed from years of CDV. That's why this should be done right after getting the car.

I completely agree. Just removed mine on Sunday and really enjoy the difference so far. What as stupid system for BMW to put in these cars.

[mcrazyrider]

Originally Posted by Lou2

Anyone have any problems with this mod. Anything break as a result?

I occasionally have problems engaging smoothly and would love to fix this...just dnt want to have problems down the road.

Just about to pull the trigger on this mod any bad expiriences with this mod?

[RupertPupkin]

Originally Posted by mcrazyrider

Just about to pull the trigger on this mod any bad expiriences with this mod?

none at all except you'll wonder why you didn't do it sooner. very very easy simple thing to do.

[mcrazyrider]

Originally Posted by RupertPupkin

none at all except you'll wonder why you didn't do it sooner. very very easy simple thing to do.

Thanks, this will be my next mod.

[pimp4cheddar]

I hate to bring a dead thread back to life...but I'm doing so anyway.

Does removing the CDV yield the same results that a "modified" CDV does???

(I know people have a DIY for the OEM one)...but Burger Tuning sells a modified CDV that's ported. Does the modified one do the same thing as removing the OEM one?

I want easier shifts...less jerking and this seems to be the fix.

[driverman]

I can see how the CDV delete/modify would make a difference when shifting fast, but does it make a difference when shifting slowly?

[plokij]

Originally Posted by driverman

I can see how the CDV delete/modify would make a difference when shifting fast, but does it make a difference when shifting slowly?

I've had 3 MT cars over the years and the CDV on my E91 doesn't really bother me. I never push the car (it won't go very quickly anyway) so I don't notice the CDV after getting used to it. I've found that if you release the throttle before depressing the clutch you will have a disjointed shift. Keep the throttle in while depressing the clutch, then release the throttle while selecting a gear, and the shift is smooth.

I would not want the CDV on a track or for frequent spirited street driving.

[Three_thirty_I]

As far as I know, the CDV delete (removing the valve altogether) and the modified CDV (professionally modified valve) should yield the same results since they are both allowing normal flow instead of the restriction...

Originally Posted by plokij

I've had 3 MT cars over the years and the CDV on my E91 doesn't really bother me. I never push the car (it won't go very quickly anyway) so I don't notice the CDV after getting used to it. I've found that if you release the throttle before depressing the clutch you will have a disjointed shift. Keep the throttle in while depressing the clutch, then release the throttle while selecting a gear, and the shift is smooth.

I would not want the CDV on a track or for frequent spirited street driving.

Yep, that was one of the first things that I found worked to smooth things out.