[tscdennab]

I noticed that I am not the only one who felt a jerky movement/thump from the drivetrain whenever I changed gears (and not paying attention to slowly release the clutch), which I described in detail here:

http://www.e90post.com/forums/showthread.php?t=557685

Today I decided to modify my CDV and get rid of the restrictor inside it. And wow, the problem is 80% gone (but keep in mind that I have also installed my LSD today, however I don't think it has anything to do with it). In normal driving I cannot induce the thump and jerky movement, only if I really try. The shifting especially from 1-2 and 2-3 is most of the time flawless, you almost can't feel it, like it's an automatic gearbox

My advice: instead of buying a $20 + shipping "professionaly ported" CDV from BMS or other shops, buy a $7 CDV from Tischer or your local dealer and stick a screwdriver inside the CDV and use a small hammer to pop the restrictor out, like here:

http://www.1addicts.com/forums/showp...8&postcount=18

You can also do this to your old CDV, of course.

[nitehawk]

Looking forward to having mine installed this weekend

[tibra1]

2 most enjoyable mods for me were the CDV and shifter kit

[CJ421]

My favorite mod ... I found the biggest improvement in smoothness getting off the line and reversing.

And it will help the clutch last longer.

I can't believe BMW even installed one of these on our cars. Makes me sad inside.

[nitehawk]

To put it in perspective, the M3 OEM CDV is hollow, just like the modified CDVs on the market. I suppose BMW assumes M3 owners know how to drive and the 335i owners dont?

[tibra1]

Originally Posted by nitehawk

To put it in perspective, the M3 OEM CDV is hollow, just like the modified CDVs on the market. I suppose BMW assumes M3 owners know how to drive and the 335i owners dont?

They used the restrictive CDV in the 335 to allow more clutch slippage and make the car idiot-prone to stalling..it is pathetic that they did this..if you dont know how to drive an MT then just get an AT

[gboop]

Originally Posted by nitehawk

To put it in perspective, the M3 OEM CDV is hollow, just like the modified CDVs on the market. I suppose BMW assumes M3 owners know how to drive and the 335i owners dont?

If it's hollow, then why even put it on the car?
I also wonder how much is the M3 version and whether it can be used on the 335i....

[LAE92]

I just deleted my CDV once I was out of warranty (3k miles ago) it doesn't FEEL like there is anything wrong, it's just far more pleasant to drive!

[blisstik]

This was like my first mod along with B&M short shifter and rounded shift knob.

[nitehawk]

Originally Posted by gboop

If it's hollow, then why even put it on the car?
I also wonder how much is the M3 version and whether it can be used on the 335i....

Being in the industry, I know automakers try to commonize as many parts as possible across models to save costs. This may be the case here, where a dummy connector may be more cost effective than modifying the hoses that surround it.

The valve housing, among parts that surround it look identical between the M3 and the 335i. However, I don't know anyone that has done this. At around ~$8, its worth a try.

[335i]
http://www.realoem.com/bmw/showparts...08&hg=21&fg=10

[M3]
http://www.realoem.com/bmw/showparts...08&hg=21&fg=10

Some more info of the M3 CDV:
http://www.m3post.com/forums/showpos...8&postcount=10

[Island Road]

Originally Posted by tscdennab

My advice: instead of buying a $20 + shipping "professionaly ported" CDV from BMS or other shops, buy a $7 CDV from Tischer or your local dealer and stick a screwdriver inside the CDV and use a small hammer to pop the restrictor out, like here:

I don't understand why buy anything unless your worried about the shop looking at your CDV. Don't waste any money took me less then 10m to get under the car remove the valve and plug it up.

But yes made a great difference, so simple.

[tibra1]

Originally Posted by islandroad83

I don't understand why buy anything unless your worried about the shop looking at your CDV. Don't waste any money took me less then 10m to get under the car remove the valve and plug it up.

But yes made a great difference, so simple.

Well an advantage of using the modified CDV vs doing the delete is you dont have to worry about pulling the steel lines and possibly breaking em..honestly for $20 what is really lost by using the modified one

[NiVeDh]

I replaced my OEM one with the M3 "CDV" and it made a difference. The M3 one doesn't have the restrictor.

[Toker335i]

i just removed mine, paid 20$ to do so, one of the best mods for a 6mt..

[Chicks-Love-Bimmers]

Got mine installed a week ago along with the clutch stop, by far the best $25 I spent and my manual driving experience is MUCH better

[EJ_3]

Originally Posted by tscdennab

http://www.e90post.com/forums/showthread.php?t=557685


My advice: instead of buying a $20 + shipping "professionaly ported" CDV from BMS or other shops, buy a $7 CDV from Tischer or your local dealer and stick a screwdriver inside the CDV and use a small hammer to pop the restrictor out, like here:

http://www.1addicts.com/forums/showp...8&postcount=18

You can also do this to your old CDV, of course.

Free CDV. I know, it's only $20... but I can't turn down free

[mikeith]

anyone have the part number for the M3 one? just going to order that from tischer

[rbsileighty]

I just removed mine completely... car's been great granted I forgot what it felt like before I removed it now haha (don't drive mine every day).

[nitehawk]

Originally Posted by mikeith

anyone have the part number for the M3 one? just going to order that from tischer

21522283914

http://www.realoem.com/bmw/showparts...08&hg=21&fg=10

[mikeith]

linky no worky but thanks for the part number

[shortseller]

This is very cool.

I wonder if replacing the stock 335i CDV with a stock M3 CDV qualifies it as NOT voiding the car's warranty(?), though I think I know the answer before I asked the question.

Plan to swap out mine during my next(between services) indy shop oil change. $8, what the hell!

[themyst]

CDV delete should be the first mod done to any manual n54. Wish they came like that from the factory.