Remove CDV

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flybobbie
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Remove CDV

Post by flybobbie » Sat Mar 29, 2014 10:17 pm

Remove stone guard.
Clamp off flexible hose with mole grip.

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Unclip quick connector

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Reconnect and bleed the slave cylinder.

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DPG
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Re: Remove CDV

Post by DPG » Sat Mar 29, 2014 10:46 pm

:thumbsup:
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budfox
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Re: Remove CDV

Post by budfox » Sat Mar 29, 2014 10:55 pm

Why did they design that pipe in the top pic to go around so many bends?
Used to ownd a 3.0si Roadster in Some Kind of Grey with Black Leather - 28k miles on a '56 plate. Foam removed, stubby fitted, stubby removed again, AUX fitted.

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Re: Remove CDV

Post by El Taco » Sun Mar 30, 2014 7:31 am

What is a CDV?

Other than canine distemper virus...

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si-forks
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Re: Remove CDV

Post by si-forks » Sun Mar 30, 2014 7:57 am

El Taco wrote:What is a CDV?

Other than canine distemper virus...
Clutch delay valve

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flybobbie
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Re: Remove CDV

Post by flybobbie » Sun Mar 30, 2014 9:17 am

Didn't want to spend too much time on the job, but i think the flexible hose would probably reach the slave cyl. which also has quick connector.
And thus remove and bypass the bendy bit of piping.
Left bendy pipe as not quite sure whats its for, might be for keeping fluid cool?

El Taco

Re: Remove CDV

Post by El Taco » Sun Mar 30, 2014 10:52 pm

What does it do and why remove it?

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jaRED
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Re: Remove CDV

Post by jaRED » Sun Mar 30, 2014 11:02 pm

El Taco wrote:What does it do and why remove it?
you can change gear more quickly without it
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flybobbie
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Re: Remove CDV

Post by flybobbie » Mon Mar 31, 2014 8:17 am

I removed it because of an annoying judder when pulling away in first gear. Removing it stopped the judder. I think a fast gear change will always be a problem due the nature of the notchy gearbox. That and the steering the only two things that spoil the enjoyment of driving the car.

Actually never considered a BM before due their gearboxes, but fell in love with the shape.

NathanZ4C
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Re: Remove CDV

Post by NathanZ4C » Mon Mar 31, 2014 8:50 am

I don't like the gearbox much either :( I thought it might just be me. I've considered removing the cdv but heard mixed reviews on doing it

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stayfrosty
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Re: Remove CDV

Post by stayfrosty » Mon Mar 31, 2014 9:46 am

I am having the CDV removed this month when The Beast is serviced. Yes, some varying reports but what is the worst that can happen? Can't image the gearchage could get much worse!
Will update once done.

Silver grey MC
Mods: Strongstrut 3 piece / Stormwerks ST1 gearknob / clutch stop / stubby / ipod integration / LED interior
Work in progress: Exhaust tweaks

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stayfrosty
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Re: Remove CDV

Post by stayfrosty » Fri Apr 04, 2014 11:36 am

Just got back from collecting The Beast from the garage after a full service and CDV removal. I also had them change the gearbox oil, just to help things still further.

What can I say? Just feels perfect now, no issues with trying to tiptoe around the gearbox and clutch. Highly recommended. Just annoyed the car left the factory with it in the first place!

Please note I also have Stormworks gearknob (500g of lovliness, I avoided the lightweight ZHP alternative) and a clutchstop fitted, and now believe I have one of the sweetest shifting Z4Ms on the planet!

Silver grey MC
Mods: Strongstrut 3 piece / Stormwerks ST1 gearknob / clutch stop / stubby / ipod integration / LED interior
Work in progress: Exhaust tweaks

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Adamski
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Re: Remove CDV

Post by Adamski » Fri Apr 04, 2014 1:04 pm

It was probably one of the best mods I did in my roadster. Instant difference and make driving a pleasure again :thumbsup:
Gone: Z4M Coupé|Black Sapphire|OEM CSLs|Aero Skirts|OEM Strut Brace|Nav|Heated Seats|Logic 7 Pro Hi-fi|Bluetooth|Carbon Leather|PDC|BMW Assist|Stubby
Gone: Cherished 2003 3.0i Black Sapphire Roadster

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wilbo
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Re: Remove CDV

Post by wilbo » Fri Apr 04, 2014 1:09 pm

This is on my to do list, hoping to do it myself one weekend soon.

Can anyone actually explain what the CDV does and I mean the engineer type response, not just ' it makes gear changes rubbish'. I am the sort of person who would just like to know how I am altering the car before removing something.

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Machine monkey
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Re: Remove CDV

Post by Machine monkey » Fri Apr 04, 2014 1:56 pm

Ok i dont have a full grasp so this might not be 100% correct.

But my understanding the CDV is to prevent harsh and sudden shocks causing damage to the DMF. From surges of power from say the clutch being drooped or poor gear changes. Its sole purpose is to protect the DMF from shock.
My little blue zed is in lots of bits. With lots of things started and not many finished! I may have found the limits of my time and ability!!

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