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      01-09-2020, 01:43 PM   #23
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Went with Independent Motorcars here in SD as they sponsor our AutoX and Chris is a great guy.

So for improvement over stock (completely subjective and assuming stock was around 4-5/10ths of perfect for me) I'd rate the manual mods as follows:

AS SSK - 8.5/10

UCP (with two washers removed from clutch stop, center position, still both springs) - 6/10 pre-CDV delete, 7.5/10 post-CDV delete (May have to play around with the springs)
Darn. I'm in Nor Cal. I may have to do this myself.

I'd agree that if the SSK is an 8.5, the UCP is about a 6.

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Originally Posted by Thescout13 View Post
CDV Delete - 9/10
WOW! I think I'm going to have to do this!!
Performance Technic in Fremont has a good reputation and can probably do it for you.

Again that 9/10 is subjective for me (I'm no expert or race car driver etc.). Maybe after a few weeks/months my opinion may adjust some. But given how cheap the part is and how easily they can do it while having the driveshaft and heat shields dropped for the SSK install, it was a no brainer for me.
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      01-09-2020, 04:37 PM   #24
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Update: starting to really like the whirring sound. Almost sounds like those insanely loud straight cut gears on race cars but at 1/50th of the volume.
Glad to hear you got these installed! I really like the increased engine sound, however slight. While the S55's exhaust note may not be everyone's cup of tea, the engine itself sounds very pleasing to me (ASD deleted).

In regards to the CDV delete, how much of a difference would you say it made? Let's say the AS SSK is an 8 (1-10). Also, do you have the UCP?

What shop did your CDV delete?
Went with Independent Motorcars here in SD as they sponsor our AutoX and Chris is a great guy.

So for improvement over stock (completely subjective and assuming stock was around 4-5/10ths of perfect for me) I'd rate the manual mods as follows:

AS SSK - 8.5/10

UCP (with two washers removed from clutch stop, center position, still both springs) - 6/10 pre-CDV delete, 7.5/10 post-CDV delete (May have to play around with the springs)

CDV Delete - 9/10
I can confirm 9/10 on the CDV delete!
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      01-09-2020, 09:27 PM   #25
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Can someone enlighten me as to what this mod does?
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      01-09-2020, 09:34 PM   #26
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Can someone enlighten me as to what this mod does?
https://en.wikipedia.org/wiki/Clutch_delay_valve


https://www.1addicts.com/forums/showthread.php?t=362654
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      01-10-2020, 02:41 PM   #27
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Thanks for the links!

Would it be fair to say that removing the CDV means potential damage if you're not highly skilled with the clutch?
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      01-10-2020, 03:22 PM   #28
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Quote:
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Thanks for the links!

Would it be fair to say that removing the CDV means potential damage if you're not highly skilled with the clutch?
I think moderate to expert skill there is nothing to worry about. But if you are a beginner and are dropping the clutch on crazy downshifts/misshifts I guess you could shock the drivetrain in a way that could be bad or lead to increased wear.

Here is a BMW tech explaining it in response to a CDV BMW delete video from Throttle House. Echos what other mechanics and BMW techs have told me.
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      01-10-2020, 04:55 PM   #29
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I definitely need to do this to my M2c.

Thanks for posting OP!
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      01-10-2020, 05:44 PM   #30
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Quote:
Originally Posted by Thescout13 View Post
Performance Technic in Fremont has a good reputation and can probably do it for you.

Again that 9/10 is subjective for me (I'm no expert or race car driver etc.). Maybe after a few weeks/months my opinion may adjust some. But given how cheap the part is and how easily they can do it while having the driveshaft and heat shields dropped for the SSK install, it was a no brainer for me.
P-Tech did my AS SSK install. I didn't know about the CDV delete at the time!

Is there another DIY on how to replace the slave cylinder, perhaps with a little more detail or basic instructions?
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      01-10-2020, 06:27 PM   #31
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Quote:
Originally Posted by RocketBoots View Post
Quote:
Originally Posted by Thescout13 View Post
Performance Technic in Fremont has a good reputation and can probably do it for you.

Again that 9/10 is subjective for me (I'm no expert or race car driver etc.). Maybe after a few weeks/months my opinion may adjust some. But given how cheap the part is and how easily they can do it while having the driveshaft and heat shields dropped for the SSK install, it was a no brainer for me.
P-Tech did my AS SSK install. I didn't know about the CDV delete at the time!

Is there another DIY on how to replace the slave cylinder, perhaps with a little more detail or basic instructions?
Not that I could find. You could try the technical manuals in the sticky. They give step by step on almost all Maintenance/repair tasks
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      01-11-2020, 09:40 AM   #32
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Anyone happen to know how many hours a shop would book for this?

I am absolutely done with the stock clutch action. The 1-2 shift is so much more difficult than it should be, and I do have to slip the clutch every time to make it smooth.
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      01-11-2020, 12:38 PM   #33
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Anyone happen to know how many hours a shop would book for this?

I am absolutely done with the stock clutch action. The 1-2 shift is so much more difficult than it should be, and I do have to slip the clutch every time to make it smooth.
Depends if they have done this before, but 2.5-4hours is probably where it is at. 2.5 for someone who has done a few of these, 4 hours for a first time.
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      01-13-2020, 07:33 AM   #34
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Quote:
Originally Posted by RocketBoots View Post
P-Tech did my AS SSK install. I didn't know about the CDV delete at the time!

Is there another DIY on how to replace the slave cylinder, perhaps with a little more detail or basic instructions?
There's a couple posts with more details pics in the F30 forum - it's the same slave

https://f30.bimmerpost.com/forums/sh....php?t=1486773

specifically post 31 has a bunch of pics https://f30.bimmerpost.com/forums/sh...5&postcount=31

I hate that I need to do this as well.

edit - and here's another: https://f30.bimmerpost.com/forums/sh....php?t=1666477 I still haven't found one with reassembly pics - that's always the hard part.
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      01-14-2020, 01:42 AM   #35
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Quote:
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Anyone happen to know how many hours a shop would book for this?

I am absolutely done with the stock clutch action. The 1-2 shift is so much more difficult than it should be, and I do have to slip the clutch every time to make it smooth.
As someone who had a CDV (on a Z4M), removed it, and put it back before getting rid of the car, I think you'll be pleased with the mod but I don't think it will really help your 1->2 shift too much.
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      01-14-2020, 06:12 PM   #36
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Quote:
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Quote:
Originally Posted by COChris View Post
Anyone happen to know how many hours a shop would book for this?

I am absolutely done with the stock clutch action. The 1-2 shift is so much more difficult than it should be, and I do have to slip the clutch every time to make it smooth.
As someone who had a CDV (on a Z4M), removed it, and put it back before getting rid of the car, I think you'll be pleased with the mod but I don't think it will really help your 1->2 shift too much.
You might be right. A lot of my frustration comes from rev hang while shifting with anything but full throttle.
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      01-15-2020, 06:37 PM   #37
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Everyone been ordering the part from ECS?
https://www.ecstuning.com/b-genuine-...r/21526785964/
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      01-15-2020, 07:22 PM   #38
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Everyone been ordering the part from ECS?
https://www.ecstuning.com/b-genuine-...r/21526785964/
I bought it from FCPEuro.
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      01-15-2020, 07:46 PM   #39
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Everyone been ordering the part from ECS?
https://www.ecstuning.com/b-genuine-...r/21526785964/
I bought from ECS
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      01-15-2020, 09:02 PM   #40
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I ordered the CDV delete from getBMWparts.com because I had another order in progress with them.

R.
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      01-17-2020, 10:24 AM   #41
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I just had the E90 clutch slave (21526785964) installed at my local performance shop, so I figured I would give some first impressions

The clutch engagement point is now much easier to feel and as a result more predictable which is great

However, the clutch pedal now feels softer throughout the range of travel and requires less effort to press or release

I don't think I like this as much as before, but perhaps I just need to get used to it

My biggest complaint or concern is that the first inch or so or pedal travel (from the top) is a lot softer than before

Because of this when the pedal is released quickly there can be a slight delay from when my foot leaves the pedal to when the pedal actually returns to its' original position which is now sometimes heard

It should be noted that I had a Technic ASD Bypass Harness installed at the same time as the clutch slave so I might just have never noticed this noise before, but I doubt it because I can feel it slightly, as well

The technician who did the swap for me mentioned (before the install) that although the dimensions of the two plastic slave cylinders appear to be more or less identical on the outside, the actual inner diameters of the cylinders are slightly different and could play a role in how the pedal behaves

Anyhow, it is certainly possible that the new slave cylinder wasn't completely bled properly, so I'll look into that first

I will also consider an Ultimate Clutch Pedal to try and make things "perfect"

So, for now, I'm undecided if this mod was right for me
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      01-17-2020, 10:59 AM   #42
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Quote:
Originally Posted by VTBoss302 View Post
I just had the E90 clutch slave (21526785964) installed at my local performance shop, so I figured I would give some first impressions

The clutch engagement point is now much easier to feel and as a result more predictable which is great

However, the clutch pedal now feels softer throughout the range of travel and requires less effort to press or release

I don't think I like this as much as before, but perhaps I just need to get used to it

My biggest complaint or concern is that the first inch or so or pedal travel (from the top) is a lot softer than before

Because of this when the pedal is released quickly there can be a slight delay from when my foot leaves the pedal to when the pedal actually returns to its' original position which is now sometimes heard

It should be noted that I had a Technic ASD Bypass Harness installed at the same time as the clutch slave so I might just have never noticed this noise before, but I doubt it because I can feel it slightly, as well

The technician who did the swap for me mentioned (before the install) that although the dimensions of the two plastic slave cylinders appear to be more or less identical on the outside, the actual inner diameters of the cylinders are slightly different and could play a role in how the pedal behaves

Anyhow, it is certainly possible that the new slave cylinder wasn't completely bled properly, so I'll look into that first

I will also consider an Ultimate Clutch Pedal to try and make things "perfect"

So, for now, I'm undecided if this mod was right for me
Damn, say it ain't so; I was looking forward to this mod but if it's going to make the clutch pedal feel drastically lighter, that's not something I would appreciate.

I know bleeding a BMW slave cylinder can be a chore, so I suggest you reserve judgment until you're sure it's done properly and there is no air left in the lines..

Keep us updated..
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      01-17-2020, 04:08 PM   #43
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Quote:
Originally Posted by VTBoss302 View Post
I just had the E90 clutch slave (21526785964) installed at my local performance shop, so I figured I would give some first impressions

The clutch engagement point is now much easier to feel and as a result more predictable which is great

However, the clutch pedal now feels softer throughout the range of travel and requires less effort to press or release

I don't think I like this as much as before, but perhaps I just need to get used to it

My biggest complaint or concern is that the first inch or so or pedal travel (from the top) is a lot softer than before

Because of this when the pedal is released quickly there can be a slight delay from when my foot leaves the pedal to when the pedal actually returns to its' original position which is now sometimes heard

It should be noted that I had a Technic ASD Bypass Harness installed at the same time as the clutch slave so I might just have never noticed this noise before, but I doubt it because I can feel it slightly, as well

The technician who did the swap for me mentioned (before the install) that although the dimensions of the two plastic slave cylinders appear to be more or less identical on the outside, the actual inner diameters of the cylinders are slightly different and could play a role in how the pedal behaves

Anyhow, it is certainly possible that the new slave cylinder wasn't completely bled properly, so I'll look into that first

I will also consider an Ultimate Clutch Pedal to try and make things "perfect"

So, for now, I'm undecided if this mod was right for me
Yeah I think the UCP will make a difference. The center spring location is makes more stuff and you can even take off one of the two springs to make it even stiffer. I would imagine with the stock pedal it may feel different like your experiencing.
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      01-17-2020, 07:47 PM   #44
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Well damn. My M5 doesn't have a CVD and I removed it from my Z4M when I bought it on principle. I was driving an F80 M3 for three years before the M2C, and didn't think that had a CDV; the M2C shifts the same to me. Maybe the F80 M3 also has a CDV? The thing is, I find the shifting feel of the M2C fine, so now I'm torn because I know the CDV is there...
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