[fanofbmwe46]

What about a part further down the drivetrain like a differential going bad… would the dealer look for a CDV delete and blame it on that? Could the CDV delete void $20k worth of downstream parts and labor..

I was initially planning to do this mod immediately but now a bit nervous.

[LuvMyE92]

Originally Posted by fanofbmwe46

What about a part further down the drivetrain like a differential going bad… would the dealer look for a CDV delete and blame it on that? Could the CDV delete void $20k worth of downstream parts and labor..

Nah. I could be wrong, but I think the diff can take it, plus most mechanics won't care plus, most importantly, since the "delete" is now all internal part removal, they're never see it.

FWIW, I've done the cdv on many prior BMWs and on the G82 I've just gotten used to it and don't let it bother me any more. Either that, or I'm too lazy to do it.

[fanofbmwe46]

Originally Posted by LuvMyE92

Nah. I could be wrong, but I think the diff can take it, plus most mechanics won't care plus, most importantly, since the "delete" is now all internal part removal, they're never see it.

FWIW, I've done the cdv on many prior BMWs and on the G82 I've just gotten used to it and don't let it bother me any more. Either that, or I'm too lazy to do it.

I wonder if it could be simply be put back in if ever an issue with clutch or trans while under warranty. Good point about it being a hard item to spot being modified unless looked for specifically.

[Indo Rider]

Originally Posted by fanofbmwe46

What about a part further down the drivetrain like a differential going bad… would the dealer look for a CDV delete and blame it on that? Could the CDV delete void $20k worth of downstream parts and labor..

I was initially planning to do this mod immediately but now a bit nervous.

Extremely unlikely. Like basically zero chance of that, but nobody on the forum can make you a guarantee. If you are really that nervous about it just keep the car bone stock. But you might as well trade it in for an auto if you'll keep it 100% stock.

[sbgolfer2221]

Originally Posted by LuvMyE92

Nah. I could be wrong, but I think the diff can take it, plus most mechanics won't care plus, most importantly, since the "delete" is now all internal part removal, they're never see it.

FWIW, I've done the cdv on many prior BMWs and on the G82 I've just gotten used to it and don't let it bother me any more. Either that, or I'm too lazy to do it.

Interesting. I’m at 1000k miles since taking delivery 12/1/22. I’m getting used to the shifts, esp 1-2 but every now and again the timing changes and it’s frustrating. Not often tho- I can get better and can live w it. But having said all that, I’m wondering how much of an improvement in direct feel/consistency the cdv delete will give me - based on your experience. Worth doing on the g80? Will improvement be noticeable?

[LuvMyE92]

Originally Posted by sbgolfer2221

Interesting. I’m at 1000k miles since taking delivery 12/1/22. I’m getting used to the shifts, esp 1-2 but every now and again the timing changes and it’s frustrating. Not often tho- I can get better and can live w it. But having said all that, I’m wondering how much of an improvement in direct feel/consistency the cdv delete will give me - based on your experience. Worth doing on the g80? Will improvement be noticeable?

I think the last car I did it on was my F30, and it's really a minor difference, but noticeable. Whether or not it's "worth doing" is up to you: will you DIY or pay a shop? If the former, do you have a lift, or enjoy working on your back with brake fluid streaming down your arm? Are you comfortable bleeding the system? If you take it to a shop, will they do the mod or will you need to buy a second slave and modify it for them, and how much will they charge you?

All of those questions, for me (no lift, too cheap to pay for a shop) makes it a no.

Originally Posted by sbgolfer2221

Interesting. I’m at 1000k miles since taking delivery 12/1/22.

Wow! A million miles in just over a year, that's awesome!!!!

(I think you meant 1K.)

[sbgolfer2221]

Lol , 1k..no coffee yet this am. Thanks!

[Indo Rider]

Originally Posted by sbgolfer2221

Interesting. I’m at 1000k miles since taking delivery 12/1/22. I’m getting used to the shifts, esp 1-2 but every now and again the timing changes and it’s frustrating. Not often tho- I can get better and can live w it. But having said all that, I’m wondering how much of an improvement in direct feel/consistency the cdv delete will give me - based on your experience. Worth doing on the g80? Will improvement be noticeable?

Assuming you're following the break-in procedure, you're not driving the car hard enough yet to appreciate how the CDV interferes with shifting the way you want to. Once you start banging through the gears WOT you will understand.

No reason to buy new slave. Taking out the restrictions is super easy to do yourself. Bleeding the clutch is the annoying part.

[sbgolfer2221]

Originally Posted by Indo Rider

Assuming you're following the break-in procedure, you're not driving the car hard enough yet to appreciate how the CDV interferes with shifting the way you want to. Once you start banging through the gears WOT you will understand.

No reason to buy new slave. Taking out the restrictions is super easy to do yourself. Bleeding the clutch is the annoying part.

Appreciate it thanks, yes following procedure so you are likely correct. Will probably purse the delete this spring

[AhsanU]

As mentioned above, you won't feel the difference in shifts at all while going through the break-in procedure. It's only during spirited driving and wanting to bang through gears that you feel it and it's the most frustrating thing as we bought manuals to enjoy rowing our own gears.

Here's my specific example of shifting 2-3 with the stock CDV, then the CDV delete. Ignore the added power from the piggyback, just focus on the shift speeds:

CDV left intact:

CDV deleted:

[fanofbmwe46]

Originally Posted by AhsanU

As mentioned above, you won't feel the difference in shifts at all while going through the break-in procedure. It's only during spirited driving and wanting to bang through gears that you feel it and it's the most frustrating thing as we bought manuals to enjoy rowing our own gears.

Here's my specific example of shifting 2-3 with the stock CDV, then the CDV delete. Ignore the added power from the piggyback, just focus on the shift speeds:

CDV left intact:
https://youtu.be/vUjzW27hZ4s

CDV deleted:
https://youtu.be/ZSo6QArXH0s

Hmm I didn’t notice any difference really in shift speed in those videos…

[AhsanU]

Originally Posted by fanofbmwe46

Hmm I didn’t notice any difference really in shift speed in those videos…

Look at how quickly 3rd gear is grabbed after the clutch is engaged in each video. There is a delay in the first video that is not there in the second video. It's subtle, but it's absolutely there.

[HiFi]

not related to CDV specifically, but something i noticed after the CDV (probably because i had a midppe installed at same time), when you clutch in at idle, theres a distinct sound difference , its almost as if the valves open. I know revs move up slightly, but ive had many other BMW M Manauals and never noticed such a difference on clutch in vs neutral when idle. Anyone know why?

[alpinepuggy]

I noticed that as well. It must be the hydraulic fluids moving through the lines now that the CDV does not restrict it. Or maybe it has always been like that... maybe you noticed it because you got a midpipe installed?

[Indo Rider]

Originally Posted by HiFi

not related to CDV specifically, but something i noticed after the CDV (probably because i had a midppe installed at same time), when you clutch in at idle, theres a distinct sound difference , its almost as if the valves open. I know revs move up slightly, but ive had many other BMW M Manauals and never noticed such a difference on clutch in vs neutral when idle. Anyone know why?

I've also noticed this too. I have valve controller with valves fully open so it's not the valve position changing...

[Adcampo]

I’ve read somewhere that ‘23 and ‘24 manuals don’t have the CDV. Can anyone confirm?

[NicolasB]

Originally Posted by Adcampo

I’ve read somewhere that ‘23 and ‘24 manuals don’t have the CDV. Can anyone confirm?

I'm going to be opening mine up and looking for it. Some say it does some say it doesn't. It's either hit and miss, which seems improbable, or people just didn't know exactly how to look for it.

[Adcampo]

Originally Posted by NicolasB

I'm going to be opening mine up and looking for it. Some say it does some say it doesn't. It's either hit and miss, which seems improbable, or people just didn't know exactly how to look for it.

Cool. Let me know what you find. I’d rather not open anything up unless needed.

[eugenebmw]

Originally Posted by Adcampo

I’ve read somewhere that ‘23 and ‘24 manuals don’t have the CDV. Can anyone confirm?

My 23 G82 does have the CDV. The shop I went to do the CDV delete show me the part that they took out. Yes, there is a different before and after the CDV delete. For me, $200 is well spent.

[Spectroman]

Originally Posted by eugenebmw

My 23 G82 does have the CDV. The shop I went to do the CDV delete show me the part that they took out. Yes, there is a different before and after the CDV delete. For me, $200 is well spent.

What changes have you noticed? I have a my 24 and been contemplating getting this done.

Also, regarding a couple of posts above, my car also makes a distinct sound when engaging in 1st gear, like the valves open up. I noticed it on day 1, fully stock.

[eugenebmw]

Originally Posted by Downshifter

What changes have you noticed? I have a my 24 and been contemplating getting this done.

Also, regarding a couple of posts above, my car also makes a distinct sound when engaging in 1st gear, like the valves open up. I noticed it on day 1, fully stock.

I have driven manual cars for over 30 years. I can jump in any car and drive smoothly not even need to think. But whenever it come to BMW manual, I have to pay attention on how I shift between gears. After the CDV delete, shifting from 1 to 2, 2 to 3 make a noticeable different in term of how smooth and fast it can be. For shifting from 3 to 2, 2 to 1, I think there is a tiny bit of different too in term of smooth.

[Needsdecaf]

Originally Posted by fanofbmwe46

What about a part further down the drivetrain like a differential going bad… would the dealer look for a CDV delete and blame it on that? Could the CDV delete void $20k worth of downstream parts and labor..

I was initially planning to do this mod immediately but now a bit nervous.

Is the CDV's function to actually protect the clutch from aggressive engagement? Or it simply a mis-placed attempt (as many things are) to "smooth things out"?

Or do we not know for sure?