cdv delete

M

mad4slalom

Senior member
had my 4m coupe a month now and love it for its rawness and edgy extreme feel but have decided just how shite the clutch feel is, and also how it affects the 1st to2nd shift, i have realised it changes gear better if you shift when the car is hardly moving orabout 4000 revs as someone else on here said, but the fact that you have to think about it and prepare yourself to change gear which in 99% of vehicles you do totally naturall without even thinking is to my mind ludicrous, its so bad it is not really even fit for purpose, my old z3m roadster was infinately better, although that had an ac schnitzer short shift kit, which may have helped. had a wild kangaroo yesterday totally random for no reason , sport button off too, so monday am sending for modified cdv and hope the difference is as good as people say. why would they send it out of the factory like that ? :headbang:
 
I'm not convinced the CDV has anything to do with a notchy shift. It's only there to have an effect on the clutch engagement. If your clutch is disengaged, what difference will the valve make on a shift? I think a notchy shift is just a feature of the 'box

Jerky take-up is another matter though. I get on fine with mine now I'm used to driving it, but a lot of people have been happier with the CDV removed.
 
Based on my experience I'd suggest you do get used to it. Not that I'm saying you should need to...I'll be interested to hear your before and after CDV delete comparison.


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i understand what you mean about cdv shouldnt affect the notchy shift, but i feel it makes the timing of the bite point so alien that i hope it will help, certainly others have said it's like night and day, again the kangarooing i think is due to not beeing easy to get a smoothe engagement of the clutch , and also the fly by wire throttle is very lightly sprung which all factored together dont help. definately affecting my enjoyment of the car, so i guess it is worth a try, plus i may get more used to it too, icant see how it could make it any worse.
 
Did the CDV a bit back, didn't make a difference to the notchy shift
But did help with the low speed gear changes, would say about a 20-25% improvement. :thumbsup: its a cheap mod so go for it :driving:
 
Can't speak for the difference to a zed, but I've completely removed my cdv (on an E46 325) and it DOES make a huge difference to 1st to 2nd gear changes and clutch control in general. . .

Go for it you wont be dissappointed.
 
Spoken about any times, on the std 3.0 difference is huge & I can vouch for that, though heard many say on the //M opinion seems not worth the effort.

Let's us know how you get on
 
Mine will be coming out soon

I took one out of my e46 and the differed aces was night and day

Sent from my GT-I9300 using Tapatalk 2
 
thanks for advice, spoke to a guy at ca re rougue clutch stop and he advised against that particular one saying it causes premature clutch wear. seemed to know his stuff, was very helpful re short shift and rogue uprated gearbox mounts.
 
mad4slalom said:
its so bad it is not really even fit for purpose
Click to expand...
You sure your clutch isn't on the way out?

Have no problems here. Lots and lots of old threads on this..
 
I dont have any problems with mine in normal or sport,granted it is not the smoothest clutch/gearbox i have ever used but to me it adds character.I tend to rev mine slightly higher when changing from 1st to 2nd ie change up roughly between 3-4k revs,i found changing up when the engine speed was slower caused kangarooing,clonks etc,also have found not completely lifting my foot right off the clutch pedal helps(takes a wee bit of practice and doesnt always work but when u get it right it works).
 
mad4slalom said:
thanks for advice, spoke to a guy at ca re rougue clutch stop and he advised against that particular one saying it causes premature clutch wear. seemed to know his stuff, was very helpful re short shift and rogue uprated gearbox mounts.
Click to expand...

I don't think this is true, a clutch stop simply stops the travel of the clutch through the dead space between the engagement point and the floor. The only way it would be a problem or cause wear would be if the clutch didn't engage correctly, in which case you couldn't change gear anyway...

Give it a try, you'll be surprised. :thumbsup:
 
Merrsh1 said:
Try a clutch stop. They are only a tenner, less if you DIY.

I find it makes a big difference. :thumbsup:
Click to expand...
+1

I was sceptical about this mod so made a DIY one which I've set up to give about 0.5" of clearance of clutch disengagement when the clutch touches the stop. So when the gear is engaged, it's a simple job of releasing the clutch without having to modulate your foot to find the engagement point, which can be a bit tricky with the Z4M in 1st and 2nd gear. I'd recommend giving this mod a try first.
 
will give this a go then, sure clutch is ok as no baulking going into forward or revers gears and no slippage, just not easy to drive smoothly , btw in the higher gears , ie 2 nd to 3rd and above is absolutely fine, to be fair it is getting easier by two stage shifting rather than ramming it into second, and more revs and also keeping pressure toward the left. also someone mentioned not coming off the throttle completely when shifting , so am getting more used to it, keep trying i guess.
 
Having had 2 e46 m3s and a Z4MC (sold 2007)I have been used to the bunny hops. Currently purchasing aZ4MC so no doubt back to them again. I always thought that the throttle pedal pivot was partly to blame especially if catching a bump as accelerating . For example I remember that the car park at the place I worked had very slight kerb on the exit followed by a sharp right turn. It was always difficult to accelerate out smoothly as the slight drop combined with accelerating seemed to kick off the hops in all 3 Ms.
 
If you don't want to go the DIY route, I got this -

http://www.ebay.co.uk/itm/BMW-Clutch-Stop-M3-E30-E36-E46-Z3-Z4-Stopper-Trim-3-series-318-325-330-manual/150867854713?ssPageName=WDVW&rd=1&ih=005&category=174099&cmd=ViewItem

Just screws in... :thumbsup:
 
mad4slalom, you really do get used to it with time and no the CDV removal does not make THAT much of a difference on an M. I drove with the CDV for several months before removing it and did not see that much of a difference.

I also have a clutch stop and think it's pretty good, along with a short shift kit which i really like.
 
Yep I havent had any problems with mine and the CDV completely down driver technique and you get used to it.
 
guys, thanks for your advice re clutch stop, been finding bits to make one up this evening, there seems to be an adjustable stop there already, the only difference in the one i've made is its longer and with a lock nut, have'nt fitted yet or tried it , is there a way to get the right amount of adjustment ?
 
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