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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Is deleting the CDV worth it?



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      08-22-2018, 02:53 PM   #23
srey
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Quote:
Originally Posted by hassmaschine View Post
yeah, I don't believe you. I've spent a lot of time under various cars with jackstands. Also you can't get even a jack under my car without driving it up on ramps first.

I stick by it's probably a noticeable difference, but I don't care enough for it to be worth the effort. I prefer my mods to be done with a laptop and a cable, because I'm old and crawling around on the ground hurts.
It's ok if you don't. If I had a stopwatch going it would probably take longer than I'm saying, but it really doesn't, honestly. Maybe I'll do it when I get home just to time it. Either way, I don't view it as much of a hassle to jack the car up. If we're talking jack it up and remove the body panels, yeah there's no way I could do it in 5 minutes. Just getting it in the air on jack stands would be close, IMO.
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      08-22-2018, 03:22 PM   #24
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Takes me a while to get the car all up in the air, as well. First I have to back it onto ramps (rear wheels), while also simultaneously backing the front wheels onto wooden boards. Then jack up the front of the car, one side at a time, and place the front on (2) stands. If I did this weekly I'm sure it would only take 5-10 minutes. But I don't, so it takes at least 15, probably.

Anyway, I think it's worth it if you do a lot of really hard driving and/or launching. I'm a pretty spirited driver, but don't beat the crap out of it. Having the CDV didn't bother me. Removing it made a small difference but the average driver wouldn't notice.

Worth it? If you race, are bored, or just like to do every mod you can.
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      08-22-2018, 08:08 PM   #25
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Quote:
Originally Posted by srey View Post
Why does it take you 30 minutes to jack up the car? No hydraulic jack? I can have the front of my car lifted and on jack stands high enough for me to access that part of the underside in about 5 minutes. Maybe a couple more if I'm putting it up on 4 jack stands.
+1

It's about 5-10 minutes for me. Drive the car up on two planks of wood, lift the front, drop it on jack stands. Lift the rear from the differential, drop it on jack stands.

The undertray takes a bit to remove, but a small impact drill/drill with socket attachment and a creeper makes quick work of the bolts. You can get it off in a few minutes.

Putting everything away takes about 30-60 minutes. 10 minutes to get the car on the ground, 30 minutes to put everything away

Last edited by Welcome to NBA Jam; 08-22-2018 at 08:30 PM..
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      08-22-2018, 08:17 PM   #26
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Aren't you suppose to purge the clutch line after you do this.
Even if it took and hour it would be worth it.

The average drives an automatic and probably couldn't drive a manual.
They just don't learn to do this anymore unless they come from
a family of car nuts.

Thieves will avoid stealing manuals because they can't drive or sell them.
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      08-22-2018, 08:45 PM   #27
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Thieves will avoid stealing manuals because they can't drive or sell them.
My favorite part, lol.
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      08-23-2018, 01:51 AM   #28
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I had a pre-LCI manual E90 (leased) and was always frustrated that I could never seem to shift as smoothly as I wanted in spite of 45 years of driving and racing stick shifts. I only found out about the existence of the CDV after we turned the car back in, but I'm pretty sure that it had something to do with what I was experiencing. I figure that the CDV made the clutch release point dependent not just on the position of the pedal but also on the rate of release, so I can see how it might make a difference to some drivers but not others depending on driving style. I can't speak to what it's like without it, but I can tell you that if we still had the car, it would have been out of there the moment I found out about it.
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      08-23-2018, 04:35 AM   #29
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Quote:
Originally Posted by ctuna View Post
Aren't you suppose to purge the clutch line after you do this.
Even if it took and hour it would be worth it.

The average drives an automatic and probably couldn't drive a manual.
They just don't learn to do this anymore unless they come from
a family of car nuts.

Thieves will avoid stealing manuals because they can't drive or sell them.
Manual cars are still very popular in Europe. I would say they are still the majority especially since if you got your driver's license on an automatic you cannot drive a manual after that.
I will take the CDV out next month when I will get under the car anyway to change the oil.
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      08-23-2018, 08:15 AM   #30
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Yes it's less spongy.
Only manual cars for 50 years.
90 years fucker, I win
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      08-23-2018, 06:06 PM   #31
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It’s definitely worth removing, but unless you have a lift, I’d say it can wait until the next time you put the car in the air for other maintenance. I’d also recommend using the Zeckhausen open valve so you don’t have to bend the hardline.

BTW, do all E9x’s not have the front center jack point? Mine does and it’s the easiest car to get on stands I’ve ever had. My E36 M3 is a huge pain by comparison.
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      08-23-2018, 07:16 PM   #32
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I couldn't say

My car had it done when I purchased. Yet, I still have a delay when releasing the pedal. If anyone knows any reason this could be happening some help would be INCREDIBLY appreciated. The delay makes for an incredibly disconnected driving experience and I think we can all agree the process of shifting is one of the most fun parts of the drive (assuming it's working correctly and you have a manual)
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      08-23-2018, 08:36 PM   #33
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90 years fucker, I win
I'd be impressed with anybody that old that could use the internet.
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      08-23-2018, 09:32 PM   #34
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if you track your car YOU need to do the CDV delete. if not you can leave it alone.

vid 1 had the CDV. tried to launch in the powerband. the whole time i thought i had a dying clutch. instead it was the cdv. 60ft on this pass was a 2.2. 15.1 @95mph.



vid2 was with the CDV delete. was able to launch in the powerband. 60 ft 1.9 BIG ASS DIFFERENCE. 14.3@97 mph.




If you have a 325i you can do this. full breakdown of time slip

https://www.e90post.com/forums/showthread.php?t=1514682
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      08-23-2018, 09:54 PM   #35
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Quote:
Originally Posted by srey View Post
Quote:
Originally Posted by hassmaschine View Post
It takes like half an hour just to get the car high enough that I can crawl under it. Then I have to remove all the annoying plastic covers, remove it, and bleed the clutch. sorry not happening in 5 minutes.
Why does it take you 30 minutes to jack up the car? No hydraulic jack? I can have the front of my car lifted and on jack stands high enough for me to access that part of the underside in about 5 minutes. Maybe a couple more if I'm putting it up on 4 jack stands.
I just use my impact to have my jack stand go up within seconds lol
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      08-24-2018, 01:56 PM   #36
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I had CDV delete done at the same time as a 335is clutch/pressure plate installed. Complete world of difference, the bite is completely different and there's so much more feedback. Would insist it to anyone with an e9x manual car.
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      11-09-2020, 05:47 PM   #37
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I asked a technician today if he could perform a CDV delete for me and he advised against it. Said it would actually make the tranny more notchy not less. He said for city driving the CDV delete is not ideal. Instead he suggested putting in braided hose to help make the shifting smoother. He said to look it up but I've found nothing on it. Anyone have any thoughts on this or made this mod?
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      11-09-2020, 05:53 PM   #38
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I asked a technician today if he could perform a CDV delete for me and he advised against it. Said it would actually make the tranny more notchy not less. He said for city driving the CDV delete is not ideal. Instead he suggested putting in braided hose to help make the shifting smoother. He said to look it up but I've found nothing on it. Anyone have any thoughts on this or made this mod?
Yes, I have a thought. Ignore what the tech told you and do the mod. I did it over 3 years ago and would never go back.
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      11-09-2020, 06:00 PM   #39
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Yes, I have a thought. Ignore what the tech told you and do the mod. I did it over 3 years ago and would never go back.
Thanks - are you doing mostly city driving or have stretches of road that allow you to get most out of the car? And what about braided hoses? Any experience with those and/or what benefit one might gain from that mod? Might the clutch stop be a good and simple first step?
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      11-09-2020, 06:14 PM   #40
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Quote:
Originally Posted by AUDELA View Post
Thanks - are you doing mostly city driving or have stretches of road that allow you to get most out of the car? And what about braided hoses? Any experience with those and/or what benefit one might gain from that mod? Might the clutch stop be a good and simple first step?
The clutch stop is less than $20. The CDV is free. Do them both, I did them both 3 years ago no complaints.

Forget braided lines that’s nonsense.
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      11-09-2020, 06:16 PM   #41
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Ask yourself honestly, do you know how to properly disengage the clutch while giving the car gas? The mod was made for the cafe racers among us who think they can, but can not.
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      11-09-2020, 07:10 PM   #42
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Originally Posted by Ozzie335i View Post
Ask yourself honestly, do you know how to properly disengage the clutch while giving the car gas? The mod was made for the cafe racers among us who think they can, but can not.
There is an art to this- some enjoy it, others would rather drive an automatic
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      11-11-2020, 06:53 AM   #43
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Quote:
Originally Posted by Biginboca View Post
The clutch stop is less than $20. The CDV is free. Do them both, I did them both 3 years ago no complaints.

Forget braided lines that's nonsense.
Thanks — appreciate the advice. I think I'll start with the clutch stop to see what difference that makes. Then the CDV. I don't have a way to lift my car so I'd likely have to pay someone to do it. Otherwise does seem like a no-brainer.

I wonder why this technician was going on about braided hoses? Maybe more work / more money??
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      11-11-2020, 10:45 AM   #44
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It's been a few years since I've been under there but weren't those lines where the CDV is already hardlines? How would making them into flex lines help anything?
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