CDV Delete

Contacted him tonight and he said he removed it, he said it was a waste of space and he does about four a week on different vehicles. If the embarrassing gear changing at speed has nothing to do with the cdv, it must work like a placebo (oh forgot my mates comment) by proxy then , because I can notice the difference every time, it's no longer like my mum has duel controls in the passenger seat and wants me to slow down. I appreciate your concerns but I bought a sports car made by the Germans, not by the British liberal traffic calming, speed bump everywhere, brigade, I want to get on when I choose, not when Kit decides too. :driving:
 
Wow .... Loads of discussion and points of view which is very healthy :D i will give mine another run out at the weekend and makes a decision based on all comments, but I am leaning towards having it done ...... Don't want to die wondering :?
 
Zeld4 said:
I know two people who had there DMF replaced recently on BMW diesels and both still had their CDV intact.
<snip>
And the fact that so many DMF's go when the CDV is still connected doesn't add up to the CDV protecting the DMF.
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Sorry to pick on your post Zeld4, I'm not trying to start a flaming war :oops: but is 2 really so many?

From my anecdotal experience with DMFs and CDVs I learnt to drive it like you adapt to any car. I stalled my Exeo Diesel a few times when I first got it. Don't do it now. Perhaps a hangover of releasing the clutch quickly on the 330?
The speed of the launch IMO has nothing to do with the cdv, I noticed it more on the 330ci from first in to second when driving normally than when launching. The revs would go up and then settle back down as the clutch engaged fully. but that got to 93k and the clutch was still working as it did when we got the car at 40k.

If someone is in the habit of doing things to a clutch that ruin a clutch, I think that CDV delete or not, your clutch will go sooner rather than later.
I know of one former colleague idiot who read online about Toyota Gearboxes lunching the syncros, and from that moment on, didn't use the clutch most of the time when changing gear as he hated his company car (and the company for that matter). Surprise Surprise, his car was in every six months for syncro failure.
 
stuart is right , in that the cdv is not related to the first to second notchy shift, that is only a problem if the driver has no mechanical undestanding or no "feel" for how things work or what is happening. the first time you drive an m you get the horrendous crunch, within a few gearchanges you get a feel for how you need to drive and shift to get an acceptable shift, I have always thought that this is the nature of the box and little mechanical intervention will change it. the cdv is a different matter imo and am sure that it should not have been put out like that, to supply a drivers car that for the main will be bought by drivers who have had a selection of performance type cars with such an unconventional feeling pedal that even for very experienced drivers make it extremely difficult to obtain a normal take off or smooth gearshift without shaking the passengers around as if you cant drive is, quite frankly inadequate. and should have been sorted out prior to release.
dont know if my z3m had a dmf or not but it had no cdv . they used to blame the notchy shift on a ballooning rubber clutch hose on those and people changed them for steel braided hoses, same old box though that again when you got a feel for it was fine. jury will still be out for a long time on this dmf issue but for me there are not enough doccumented cases of dmf failure , and/or proof that it is cdv related to make many people refit the valves in huge numbers. :driving:
 
For people like me though, who have an extended warranty costing £80 a month, deleting the CDV is a bit daft. If you were unfortunate to have premature clutch/flywheel failure not related to wear and tear, where is one of the first places the dealer is going to check?....it's such a common mod that if it was me, and I was looking at wriggling out of funding an expensive warranty claim, I'd be looking there and checking if it was still present and unmodified.
 
yes a pridicament, put up with rubbish drive forever in case you have a problem, or delete and enjoy car as it should be, but when you think about it ,there are plenty of track day fiends here who have driven their cars way closer to the extreme tnan most road drivers do and you would think they would have had more dmf cdv probs if the problem existed to any great degree.dmf probs can and have developed on numerous cars not just bmw.s luck of the draw as was vanos probs , some will get it some wont,understand about the warranty issues though. :driving:
 
Hmmmm.. Interesting, I think if it were just me driving the Z then I'd go for the delete, but as the GF occasionally drives the car, she's not too smooth on the clutch, it could have issues..
 
Wildfire said:
Hmmmm.. Interesting, I think if it were just me driving the Z then I'd go for the delete, but as the GF occasionally drives the car, she's not too smooth on the clutch, it could have issues..
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I'd not have that issue as my wife is a superb driver having had a few lotuses etc. Her rev matching when changing down and really pushing is totally seamless, something to which I can only aspire.
Seriously considering this mod though as I'm sick of the car not keeping up with my feet!
May seem a daft question but is it as easy to refit?

Sent from some bloody gadget using Tapatalk
 
I'm going to give this a go on the drive in the morning, as long as the rain stays away. I intend to just remove it, then bleed the system, with the wife pumping the pedal.... As for refitting Greg, just a case of reversing the procedure, as long as you have not drilled out the existing one.
Greg I'm only up the road from you, so if you want to do both at the same time or try mine once I've done it, message me
 
daveR6 said:
I'm going to give this a go on the drive in the morning, as long as the rain stays away. I intend to just remove it, then bleed the system, with the wife pumping the pedal.... As for refitting Greg, just a case of reversing the procedure, as long as you have not drilled out the existing one.
Greg I'm only up the road from you, so if you want to do both at the same time or try mine once I've done it, message me
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Hi Dave. PM sent... :thumbsup:

Cheers, Greg
 
This is one of those mods that only you can decide.

I did it on my old Z4 and the difference was like night and day, and never regretted it. Don't know if my ///M has had the mod or not, I'm happy with it as is so will leave alone.

Some will say learn how to drive round it, much like gannet (old forum member) said. Then one day for what ever reason he removed it. Although he claimed he had learned how to drive round it he couldn't believe how much better it was without it.

As I see it, leave the CDV fitted you will wear the clutch out quicker, take it out some say you will damage the DMF. Six of one half a dozen of the other. But how many times do garages tell you that you need to change the flywheel when the clutch is knackered? Seem to be one of those extra costs now, like changing the water pump when changing cam belts.
 
GregZ4 said:
daveR6 said:
I'm going to give this a go on the drive in the morning, as long as the rain stays away. I intend to just remove it, then bleed the system, with the wife pumping the pedal.... As for refitting Greg, just a case of reversing the procedure, as long as you have not drilled out the existing one.
Greg I'm only up the road from you, so if you want to do both at the same time or try mine once I've done it, message me
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Hi Dave. PM sent... :thumbsup:

Cheers, Greg
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Have sent email too as PM stuck in outbox.

Just need to know where and what time?

Can have a mini meet and I can pump the pedals... :)

Cheers
Greg

Sent from some bloody gadget using Tapatalk
 
Well I've just driven back from DaveR6s after we spent an hour or two at our mini meet.

I'm sure he'll post some pics but let's say it involved ramps for the first bit which was a CDV delete. :)

I can honestly say it has made a difference as the car is now more hooked up to me and I can shift quicker. :driving:

I know he's taken some photos of us with some plastidip too, but I'm not stealing his thunder.......

I want say a big thanks to Dave who is a top bloke. Really enjoyed the trip out and I've learnt quite a bit. :thumbsup:
 
Thanks Greg
it was great to meet up with a fellow enthusiast :thumbsup: , I totally agree, the feeling from the clutch is far better, I feel in control at last... :driving:
I have done a very brief how to idiots guide & will post on "how to" section
 
And as for the guys paying for warranties, how about keeping the valve and popping it back in if needed?

Just a thought..........
 
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