elevensies
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thats brill thanks 
Cdv removal clutch delay valve OMG!
- Thread starter jamie_z4
- Start date
Vornwend said:I want to get this done on mine too. Is there anyone near Bristol/Gloucester who does it as I don't have exactly the right tools or lifting kit to get comfortable access to it. Obviously I'd be prepared to pay for your time
This is a job any garage should be more than capable of doing for you. Alot of general garsges might not have heard of it but certainly anyone familiar with BMWs such as a specialist will have. It's not like say a roof motor relocation that in many cases is beyond the remit of even BMW specialists and more the domain of some of the folks on here.
jamie_z4 said:dhobbs said:My car was in Munich Legends in Sussex recently having the ABS pump repaired, I said whilst you're there can you whip the CDV off, and they said yes but we'll have to order a braided hose to replace the rubber one! I said I thought it was a simple job of just removing the little CDV and joining the two pipes together!
I said don't bother then!
Still got it in
utter bullshit. sounds like they couldn't be arsed doing it
I'm not wholly convinced by their expertise to be honest. Their communication is terrible. They repaired my ABS pump and didn't bleed the system properly, had to take it back and get it re-bled!
dhobbs said:jamie_z4 said:dhobbs said:My car was in Munich Legends in Sussex recently having the ABS pump repaired, I said whilst you're there can you whip the CDV off, and they said yes but we'll have to order a braided hose to replace the rubber one! I said I thought it was a simple job of just removing the little CDV and joining the two pipes together!
I said don't bother then!
Still got it in
utter bullshit. sounds like they couldn't be arsed doing it
I'm not wholly convinced by their expertise to be honest. Their communication is terrible. They repaired my ABS pump and didn't bleed the system properly, had to take it back and get it re-bled!
Sounds like one to avoid
North West Surrey
Not a Z4, but it's mechanically the same as a pre-facelift so kind of relevant.
Anyway I just collected my 325ti from being serviced and having the CDV removed. I also had the gear-lever bushing replaced and gearbox oil changed.
I've only done a few miles in it, but it feels like a different car with a much less sloppy gearchange and no kangarooing! If only I'd had it done sooner. :roll:
Anyway I just collected my 325ti from being serviced and having the CDV removed. I also had the gear-lever bushing replaced and gearbox oil changed.
I've only done a few miles in it, but it feels like a different car with a much less sloppy gearchange and no kangarooing!
If only I'd had it done sooner. :roll:Really interested in this because I hate the 1 to 2 shift on my Z I find I have to alter the sequencing between my right and left foot differently (and more carefully) than any other car I have driven, to get anything like an acceptable pull away. Even then the shift feels very clunky, I assume this mod will make this better.
The only concern I have is I am not really following why did BMW fit it in the first place if it makes the gearchange a less pleasant experience, there must be some benefit of it being there (presumably it protects against something). If so what are the risks of removing it?
The only concern I have is I am not really following why did BMW fit it in the first place if it makes the gearchange a less pleasant experience, there must be some benefit of it being there (presumably it protects against something). If so what are the risks of removing it?
Magicarcher said:
In short - none!
BMW fitted them to basically "protect the drivetrain from abuse" ie people repeatedly "dumping" the clutch, yup in a "sports car" so basically, no matter how quickly YOU release the clutch, it will only engage at the preset maximum speed allowed by the CDV.
Remove the CDV and YOU get the control of how fast & when it engages.
Mike
Magicarcher said:
I'd really recommend getting the CDV deleted - it improves the car so much.
Fortunately the CDV had been removed from both my Z4s before I bought them, so they've always driven properly!
Removing it won't result in damage to anything else in the drivetrain so long as you drive it right!
Very interesting. I thought I had a super-heavy flywheel or a tired dmf! Gear changes definitely no great and not a sensation I find in other cars... Will be doing this mod at some point. I knew the change wasn't great but didn't know the reason why. Thanks for the info and details how to do it...
Did this earlier today, the clutch appears much lighter, can feel the bite and 1-2 smoother.
b19rak said:
£80!!! It's a 10 mins job.... It's easily doable with a trolley jack and an axle stand....
Mike
b19rak said:
That's a serious piss take. Most indies charge circa £35-£65 + vat an hour depending on who/where they are etc. With specialists changing £50-70 + vat an hour again depending on where they are. Most have a minimum charge of half an hour. but even so, thats double even the priceier specialists etc. Its usually more cost affective to get this done with other work when some will even do it as a freebie as it a quick job.
Just did this on mine...but had the mechanic sort it - only took him 20mins
I used to find shifting from first to second and second to third a bloody nightmare, clutch felt heavy and sluggish and it just made town driving a nightmare. But with this thing thrown away it feels like it should... Light, easy to engage and smooth.... Wtf we're bmw thinking when they installed this stupid thing??....my guess it was for the yanks
So highly recommend, but be careful - you are messing with a line connected to your brakes... For £20 the mechanic can sort
I used to find shifting from first to second and second to third a bloody nightmare, clutch felt heavy and sluggish and it just made town driving a nightmare. But with this thing thrown away it feels like it should... Light, easy to engage and smooth.... Wtf we're bmw thinking when they installed this stupid thing??....my guess it was for the yanks
So highly recommend, but be careful - you are messing with a line connected to your brakes... For £20 the mechanic can sort
Did mine last year and it made a small improvement....not the chalk and cheese some have reported. You do need to bleed the system after removing the CDV (some say you don't, but any time you crack a hydraulic line.....you do) and that may fix a problem you didn't know you had, like air in the system, which makes it feel better. By the way while the clutch/brake lines are connected directly to a mutual master cylinder, they are separated internally I believe. You don't want a clutch fluid leak leading to brake failure.jpvd said:Just did this on mine...but had the mechanic sort it - only took him 20mins
I used to find shifting from first to second and second to third a bloody nightmare, clutch felt heavy and sluggish and it just made town driving a nightmare. But with this thing thrown away it feels like it should... Light, easy to engage and smooth.... Wtf we're bmw thinking when they installed this stupid thing??....my guess it was for the yanks
So highly recommend, but be careful - you are messing with a line connected to your brakes... For £20 the mechanic can sort
rdgreen said:Did mine last year and it made a small improvement....not the chalk and cheese some have reported. You do need to bleed the system after removing the CDV (some say you don't, but any time you crack a hydraulic line.....you do) and that may fix a problem you didn't know you had, like air in the system, which makes it feel better. By the way while the clutch/brake lines are connected directly to a mutual master cylinder, they are separated internally I believe. You don't want a clutch fluid leak leading to brake failure.jpvd said:Just did this on mine...but had the mechanic sort it - only took him 20mins
I used to find shifting from first to second and second to third a bloody nightmare, clutch felt heavy and sluggish and it just made town driving a nightmare. But with this thing thrown away it feels like it should... Light, easy to engage and smooth.... Wtf we're bmw thinking when they installed this stupid thing??....my guess it was for the yanks
So highly recommend, but be careful - you are messing with a line connected to your brakes... For £20 the mechanic can sort
I definitely feel the improvement - lighter, which is probably due to the restriction being removed and easier to engage gears and not having to slip the clutch in first and second anymore... Glad I did it..