Anyone regretted having the CDV mod?
- Thread starter jamesgarbett
- Start date
Several years ago when I was checking in at the service counter at my non-dealer service center to have my modified CDV valve installed, another customer asked what was the CDV valve for. The service writer said it was so my wife could drive the car. I think that is a little harsh but why would BMW engineer a component the would reduce drive train shock at the cost of clutch wear and a lack of control feel in the "Ultimate Driving Machine"? Why not introduce a SDV so that your steering inputs become as vague and muddled as a 1960's Detroit uber-sedan?
James_G said:
Jack from usual side point and place the axle stand under the engine jacking point.
Non M - jack from usual point and place axle stand where wishbone connects sort of near the gearbox.
I did this mod a while back and am happy with the improvement, not vastly better, but does make the driving experience better.
Jack, support, clamp clutch fluid pipe, remove CDV, join remaining ends, 2 min clutch bleed .........done!
Biggest problem is access, the job is a doddle. Make sure you have the required tools with you and reachable under the car, plus some kitchen roll/cloth.
Tools - open ended spanners for each end of the CDV and a ring spanner for the clutch bleed and somewhere to bleed the fluid into.
If my memory serves me right 17mm & 11mm were involved somewhere on this job.
inkey$, I don't think you'll regret it. Even if you can't tell the difference (which I doubt) you won't have lost anything more than £20-30 it should cost you to have someone do the job.
It's a doddle for someone with a ramp to do. For the amount of effort to do it on the floor, i'd just pay someone to swap it out. It really won't take a garage more than 5-10 minutes once the car is in the air.
It's a doddle for someone with a ramp to do. For the amount of effort to do it on the floor, i'd just pay someone to swap it out. It really won't take a garage more than 5-10 minutes once the car is in the air.
Had CDV removed today. I was a little skeptical but I have to say the gear change is now far more slick and has an easy feel to it particularly when going from third to fourth.
Well worth considering
Well worth considering
Dav the wheel nut said:Had CDV removed today. I was a little skeptical but I have to say the gear change is now far more slick and has an easy feel to it particularly when going from third to fourth.
Well worth considering
Seals the deal for me
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Who is doing yours?
CDV removed last week. There is little difference when driving normally, but there is most certainly a worthwhile improvement when making swift changes - this is true of up shifts and also when double declutching. In fact, it is during this latter manoeuvre that the greatest benefits are to be found - at last the clutch now does exactly what it is supposed to do at the time that the pedal is moved rather the following day 
Also, I haven't bunny-hopped since the CDV was removed, but that was a fairly uncommon occurance anyway. Over all, I'd say it is worth removing it from an ///M if you drive in such a fashion that rapid clutch engagement is important
Also, I haven't bunny-hopped since the CDV was removed, but that was a fairly uncommon occurance anyway. Over all, I'd say it is worth removing it from an ///M if you drive in such a fashion that rapid clutch engagement is important 