CDV Delete: Experienced Opinions Please

inTgr8r · 12-04-2016, 07:02 PM

Quote:

Originally Posted by JJZ4MR

I've been driving my 06 Z4M for two weeks now. The clutch makes me feel like I nearly never quite get it right, but then I do a smooth quick shift and I think it's me, I need to just keep getting used to this. Now I'm convinced it's gotta go.....Question, where do I get the "regular " valve ? Parts store could not find it on their computer today. Or is it " better " to just take it out, connect line straight in ?

Just remove it, its a 5min job once on the hoist.
Clutch line reconnects with no other hardware required.

Boosted 1 · 12-06-2016, 02:23 AM

Second that. Don't waste money on buying a new one. Just remove it! I did this about a month ago and it made a HUGE difference!!!!!

RABAUKE · 12-06-2016, 07:25 AM

Quote:

Originally Posted by elerner61

WINNER! I feel like we're twins (except I've got 15 more years manual tranny experience...DAMN, just told you guys that I'm OLD).

Thanks for the great reply.

Really? I've got 40 years driving the stick.....damn, now I feel old.

JJZ4MR · 03-26-2017, 07:01 PM

I bought my 06 Z4MR 4 months ago. I had never heard of a CDV before, but it was one of the first things I saw after joining this site. So, first thing was to get an oil change, Which my indi charges $ 84 to do. Decided at that price VS $ 280 at the Stealership, seemed reasonable. I researched doing it myself and thought it made sense to have the indi do oil/CDV out at the same time. I'm lift challenged at this time. So I explain that I want this out, how it's done and why I want it removed, set the appointment, take it in, get the call to pick up car ( I can walk there in 10 mins ) And I get told that they were not wanting to take it out, so they didn't. I was pissed. He picked up on this and said " we'll take it out next time your in " There was almost no next time. He also told me my CPV was leaking and it should be addressed soon. So along with VT engine mounts/RE Tranny mounts I had the work done a few days ago. OMG ! What a difference ! My weekend play car has been for the last 13 years my 1972 240 Z with a 3.1 Stroker ( it's for sale ) Before that, 72 Mach One Fastback with an inline 4 speed Hurst Shifter. I know clutches. I drive spiritedly often. If you just cruise in your car, shift slow and methodically and don't jump off at red lights, you probably are fine leaving it in. For the last 4 months I've been unsure of every takeoff, every 1st-2nd shift. Oh, I got better. No more snapping peoples necks, jerking shifts. But I've been hating the shifting for 4 months. Cursing my indie for not doing what I asked to be done to begin with. He's NEVER had a Z4M in his shop. Anyway, for the last few days I'm SO HAPPY ! Car shifts correct. Smooth every time. Of coarse the other improvements/mods done at the same time I'm sure helped too. I think with all of the changes the car is putting all the torque to the wheels. But I'm now having to get used to it. I'm thinking " oh yeah, I don't have to move the shifter, one thousand one...and...let up on clutch" This is an old thread, but if you have any doubts...TAKE IT OUT-DIRECT LINE IN !

kbuva06 · 03-27-2017, 10:57 AM

good info in this thread. trying to get my one post to put up a WTB stock intake thread!

If anyone has one sitting around, send me a message. Also willing to trade for an aFe unit.

dc_wright · 03-27-2017, 11:24 AM

You guys with the M cars are lucky! On my 3.0si the hose comes up about an 1/8" short of being able to reach to just connect it, so you have to drill out the guts of the CDV and put the CDV body back in.

JJZ4MR · 03-27-2017, 12:05 PM

I know they make modified ones, that have been made that way, not drilled. I came across some info somewhere that talked about the risks of drilling. Can't recall where I saw the moded valves, as I knew that direct line in was my solution. Wonder if you could just get a longer hydraulic line, with the proper fittings on each end. I'm sure some company makes a hose 1" longer than what you have.

RossBMWZseries · 03-27-2017, 01:16 PM

Quote:

Originally Posted by kbuva06

good info in this thread. trying to get my one post to put up a WTB stock intake thread!

If anyone has one sitting around, send me a message. Also willing to trade for an aFe unit.

Check your PM, I'm willing to trade!

kaybat · 03-27-2017, 03:40 PM

on my M, i popped the restrictor out and put cdv back in, and it started dripping fluid(instantly), i removed it completely, and its been fine since.

GuidoK · 03-27-2017, 03:53 PM

Quote:

Originally Posted by dc_wright

You guys with the M cars are lucky! On my 3.0si the hose comes up about an 1/8" short of being able to reach to just connect it, so you have to drill out the guts of the CDV and put the CDV body back in.

Are you sure?

According to bmw ETK the 3.0si and the pre-fl 3.0i (what I have) have exactly the same clutch hose-pipe assembly, and on my car the cdv can be removed no problem whatsoever. Hose and pipe mate perfectly. room to spare.

Z4m seems to use a different pipe (different slave cylinder pipe routing) but they come out at the same bracket and on the other side sits again the same hose.
So regarding cdv removal its all the same I think.

Finnegan · 03-27-2017, 07:43 PM

Quote:

Originally Posted by JJZ4MR

I bought my 06 Z4MR 4 months ago. I had never heard of a CDV before, but it was one of the first things I saw after joining this site. So, first thing was to get an oil change, Which my indi charges $ 84 to do. Decided at that price VS $ 280 at the Stealership, seemed reasonable. I researched doing it myself and thought it made sense to have the indi do oil/CDV out at the same time. I'm lift challenged at this time. So I explain that I want this out, how it's done and why I want it removed, set the appointment, take it in, get the call to pick up car ( I can walk there in 10 mins ) And I get told that they were not wanting to take it out, so they didn't. I was pissed. He picked up on this and said " we'll take it out next time your in " There was almost no next time. He also told me my CPV was leaking and it should be addressed soon. So along with VT engine mounts/RE Tranny mounts I had the work done a few days ago. OMG ! What a difference ! My weekend play car has been for the last 13 years my 1972 240 Z with a 3.1 Stroker ( it's for sale ) Before that, 72 Mach One Fastback with an inline 4 speed Hurst Shifter. I know clutches. I drive spiritedly often. If you just cruise in your car, shift slow and methodically and don't jump off at red lights, you probably are fine leaving it in. For the last 4 months I've been unsure of every takeoff, every 1st-2nd shift. Oh, I got better. No more snapping peoples necks, jerking shifts. But I've been hating the shifting for 4 months. Cursing my indie for not doing what I asked to be done to begin with. He's NEVER had a Z4M in his shop. Anyway, for the last few days I'm SO HAPPY ! Car shifts correct. Smooth every time. Of coarse the other improvements/mods done at the same time I'm sure helped too. I think with all of the changes the car is putting all the torque to the wheels. But I'm now having to get used to it. I'm thinking " oh yeah, I don't have to move the shifter, one thousand one...and...let up on clutch" This is an old thread, but if you have any doubts...TAKE IT OUT-DIRECT LINE IN !

I see you're sticking with a theme with car types. Love the 240. It's great that this old thread still is helpful. Clutch control is much easier w/o that thing, and the transmission and motor mounts on top of it just change things so much for the better. Enjoy!

JJZ4MR · 03-27-2017, 08:55 PM

Loving this car, big grin everytime I take the car cover off the car cover ( yep 2 ) Now the shifting is what I expect in a performance BMW.

G80indy · 03-28-2017, 09:02 AM

It's been weird from BMW over the years...
1993 318is -- no CDV (sold)
1994 325ic 'vert -- no CDV (sold)
2000 Z3 2.3 (2.5L) -- no CDV
2002 330i -- had CDV..... removed it, no modded piece inserted
2006 Z4M -- had CDV .... removed it , added modded CDV (sold)
2013 e92 M3 -- no CDV

JJZ4MR · 03-28-2017, 10:14 AM

Quote:

Originally Posted by Finnegan

I see you're sticking with a theme with car types. Love the 240. It's great that this old thread still is helpful. Clutch control is much easier w/o that thing, and the transmission and motor mounts on top of it just change things so much for the better. Enjoy!

I also have had a 84 and 86.5 Supra, and 2 Datsun 240 Z's. Love the long nose, short rear "wedge" shape, while I was searching roadsters I drove a TR8 twice, but it takes some major engine mods to get that thing up to speed. Jag Etype from the 60/70 has been a desired car of mine since the 80"s, probably could of paid a reasonable price for one back then. V12 !

XMetal · 03-29-2017, 11:04 PM

Well...add me to the list of CDV-less after a loooooooong hold out. Somehow, JJ's posts and revival of this thread just pushed me over to "Just DO IT". Got my brake fluid flushed this morning and told my indy to take out the CDV while they're at it. Loving the delete thus far

JJZ4MR · 03-30-2017, 12:58 PM

XMetal...you've been on this site for 7 years and JUST did it !? I'm glad I helped you take the plunge. I'ts the best "free" mod any Z4M owner can do IMO.

XMetal · 03-30-2017, 01:48 PM

Yeah...I know I'm a super slow adopter. Maybe I'm just stubborn thinking I could "master a variable", as someone had previously said. In the back of my mind, I'd always thought there must be a reason for those ///M division guys to put in this cost adder or they would not had done it otherwise. All that is out the windows now since I took the plunge

It's not a completely "free" mod as I had to pay 0.5 hour worth of labor for them to take it out and bleed it with their "special" slave cylinder tool.

JJZ4MR · 03-30-2017, 02:02 PM

Mine did it by clamping and keeping the hose high, no bleeding needed. How do you like the feel ? I haven't had much seat time since the mods...working is interfering with my fun, then GF ( live in ) got real sick this last weekend, so I had to play nurse. This weekend is supposed to be perfect for the vert. Sunny 80* ! I'm wondering how the heat of of the impending Summer will effect my enjoyment. I'm right between St Pete and Clearwater on the coast. Spring break beach driving has some real nice "views" lately. I'll probably do more night/early AM driving once it really gets hot

XMetal · 03-30-2017, 02:51 PM

My indy is very meticulous. He wanted to bleed the slave cylinder properly so there is no if and or buts about the clutch pedal feel afterward - I won't argue with that. I haven't had much seat time in mine either since a few short drives yesterday, but the difference could be felt immediately. The engagement point is much more precise. I don't have to concentrate too much on releasing the latter half the clutch to be smooth anymore. Hope to get more seat time this weekend, if other activities doesn't get too much in the way.

G80indy · 03-30-2017, 03:18 PM

Plus the benefit of less clutch wear

JJZ4MR · 03-30-2017, 04:43 PM

Do you guys have a Clutch Stop ? For $10 it's a great mod. I'm going to get around figuring how to move the magnetic mechanism, so I can go with a bit less travel AND be able to start the car....I feel like I could still get 3/4 of an inch or so less travel. I actually would like EVERY BIT of fluid in the car, flushed and refilled. Didn't know there was a "special" slave tool needed. Diff/Tranny with Dimple magnetic plugs is in my " SOON TO DO" list

XMetal · 03-30-2017, 10:59 PM

I did the ebay clutch stop as soon as I heard about it. I set mine about a 1/4 inch from the relay switch trigger, which leaves about 3/4 of an inch of travel (from the stop) before the clutch engage. This left enough margin to safely start everytime - never had a starting issue.

Here's a home made slave cylinder bleed tool => http://www.bimmerfest.com/forums/sho...d.php?t=414188
The BMW "special" tool that I saw my indy use looked similar, but easier to operate.

12-06-2016, 02:23 AM	#46
Boosted 1 Where Does He Get Those Wonderful Toys? 94 Rep 290 Posts Drives: 07 M coupe, Gx470, M2 PE Join Date: Feb 2011 Location: Pel’lum iTrader: (5)	Second that. Don't waste money on buying a new one. Just remove it! I did this about a month ago and it made a HUGE difference!!!!!
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03-26-2017, 07:01 PM	#48
JJZ4MR Private First Class 30 Rep 194 Posts Drives: 06 Z4M Roadster Join Date: Nov 2016 Location: Largo Fl iTrader: (0) Garage List 2006 Z4MR [0.00] 1972 For Sale Datsun [0.00] 2001 Dog/kayak haul ... [0.00] 2010 Daily Driver H ... [0.00]	CDV Finally OUT ! I bought my 06 Z4MR 4 months ago. I had never heard of a CDV before, but it was one of the first things I saw after joining this site. So, first thing was to get an oil change, Which my indi charges $ 84 to do. Decided at that price VS $ 280 at the Stealership, seemed reasonable. I researched doing it myself and thought it made sense to have the indi do oil/CDV out at the same time. I'm lift challenged at this time. So I explain that I want this out, how it's done and why I want it removed, set the appointment, take it in, get the call to pick up car ( I can walk there in 10 mins ) And I get told that they were not wanting to take it out, so they didn't. I was pissed. He picked up on this and said " we'll take it out next time your in " There was almost no next time. He also told me my CPV was leaking and it should be addressed soon. So along with VT engine mounts/RE Tranny mounts I had the work done a few days ago. OMG ! What a difference ! My weekend play car has been for the last 13 years my 1972 240 Z with a 3.1 Stroker ( it's for sale ) Before that, 72 Mach One Fastback with an inline 4 speed Hurst Shifter. I know clutches. I drive spiritedly often. If you just cruise in your car, shift slow and methodically and don't jump off at red lights, you probably are fine leaving it in. For the last 4 months I've been unsure of every takeoff, every 1st-2nd shift. Oh, I got better. No more snapping peoples necks, jerking shifts. But I've been hating the shifting for 4 months. Cursing my indie for not doing what I asked to be done to begin with. He's NEVER had a Z4M in his shop. Anyway, for the last few days I'm SO HAPPY ! Car shifts correct. Smooth every time. Of coarse the other improvements/mods done at the same time I'm sure helped too. I think with all of the changes the car is putting all the torque to the wheels. But I'm now having to get used to it. I'm thinking " oh yeah, I don't have to move the shifter, one thousand one...and...let up on clutch" This is an old thread, but if you have any doubts...TAKE IT OUT-DIRECT LINE IN ! __________________ Topless and getting my degree
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03-27-2017, 10:57 AM	#49
kbuva06 Registered 0 Rep 3 Posts Drives: 2006 M coupe Join Date: Mar 2017 Location: DC iTrader: (0)	good info in this thread. trying to get my one post to put up a WTB stock intake thread! If anyone has one sitting around, send me a message. Also willing to trade for an aFe unit.
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03-27-2017, 11:24 AM	#50
dc_wright Captain 249 Rep 758 Posts Drives: 2006 Z43.0si Roadster Join Date: Oct 2014 Location: Orlando, FL iTrader: (0)	You guys with the M cars are lucky! On my 3.0si the hose comes up about an 1/8" short of being able to reach to just connect it, so you have to drill out the guts of the CDV and put the CDV body back in. __________________ Top Down 365
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03-27-2017, 12:05 PM	#51
JJZ4MR Private First Class 30 Rep 194 Posts Drives: 06 Z4M Roadster Join Date: Nov 2016 Location: Largo Fl iTrader: (0) Garage List 2006 Z4MR [0.00] 1972 For Sale Datsun [0.00] 2001 Dog/kayak haul ... [0.00] 2010 Daily Driver H ... [0.00]	I know they make modified ones, that have been made that way, not drilled. I came across some info somewhere that talked about the risks of drilling. Can't recall where I saw the moded valves, as I knew that direct line in was my solution. Wonder if you could just get a longer hydraulic line, with the proper fittings on each end. I'm sure some company makes a hose 1" longer than what you have. __________________ Topless and getting my degree
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03-27-2017, 03:40 PM	#53
kaybat First Lieutenant 126 Rep 355 Posts Drives: '06 Z4MR, '14 Cayman S Join Date: Aug 2013 Location: Ormond Beach,Fl iTrader: (1) Garage List '06 Z4M [0.00]	on my M, i popped the restrictor out and put cdv back in, and it started dripping fluid(instantly), i removed it completely, and its been fine since. __________________ Ken B.(BMWCCA/PCA/ZSCCA/SCCA)
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03-27-2017, 08:55 PM	#56
JJZ4MR Private First Class 30 Rep 194 Posts Drives: 06 Z4M Roadster Join Date: Nov 2016 Location: Largo Fl iTrader: (0) Garage List 2006 Z4MR [0.00] 1972 For Sale Datsun [0.00] 2001 Dog/kayak haul ... [0.00] 2010 Daily Driver H ... [0.00]	Loving this car, big grin everytime I take the car cover off the car cover ( yep 2 ) Now the shifting is what I expect in a performance BMW. __________________ Topless and getting my degree
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03-28-2017, 09:02 AM	#57
G80indy Save the Manuals 1714 Rep 2,937 Posts Drives: Z3, E46, G80 Join Date: May 2005 Location: Indy iTrader: (0)	It's been weird from BMW over the years... 1993 318is -- no CDV (sold) 1994 325ic 'vert -- no CDV (sold) 2000 Z3 2.3 (2.5L) -- no CDV 2002 330i -- had CDV..... removed it, no modded piece inserted 2006 Z4M -- had CDV .... removed it , added modded CDV (sold) 2013 e92 M3 -- no CDV __________________ 2023 G80 6MT, CCBs 2002 330i Dinan, 5MT 2000 Z3 Conforti, 5MT
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03-29-2017, 11:04 PM	#59
XMetal Colonel 1127 Rep 2,861 Posts Drives: Anything Join Date: Apr 2010 Location: SoCal iTrader: (0) Garage List 2008 Z4M Coupe [10.00] 2018 Audi S3 [0.00] 2004 X5 [8.50]	Well...add me to the list of CDV-less after a loooooooong hold out. Somehow, JJ's posts and revival of this thread just pushed me over to "Just DO IT". Got my brake fluid flushed this morning and told my indy to take out the CDV while they're at it. Loving the delete thus far Attached Images
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03-30-2017, 12:58 PM	#60
JJZ4MR Private First Class 30 Rep 194 Posts Drives: 06 Z4M Roadster Join Date: Nov 2016 Location: Largo Fl iTrader: (0) Garage List 2006 Z4MR [0.00] 1972 For Sale Datsun [0.00] 2001 Dog/kayak haul ... [0.00] 2010 Daily Driver H ... [0.00]	XMetal...you've been on this site for 7 years and JUST did it !? I'm glad I helped you take the plunge. I'ts the best "free" mod any Z4M owner can do IMO. __________________ Topless and getting my degree
	Appreciate 1 XMetal1126.50 Quote

03-30-2017, 01:48 PM	#61
XMetal Colonel 1127 Rep 2,861 Posts Drives: Anything Join Date: Apr 2010 Location: SoCal iTrader: (0) Garage List 2008 Z4M Coupe [10.00] 2018 Audi S3 [0.00] 2004 X5 [8.50]	Yeah...I know I'm a super slow adopter. Maybe I'm just stubborn thinking I could "master a variable", as someone had previously said. In the back of my mind, I'd always thought there must be a reason for those ///M division guys to put in this cost adder or they would not had done it otherwise. All that is out the windows now since I took the plunge It's not a completely "free" mod as I had to pay 0.5 hour worth of labor for them to take it out and bleed it with their "special" slave cylinder tool.
	Appreciate 0 Quote

03-30-2017, 02:02 PM	#62
JJZ4MR Private First Class 30 Rep 194 Posts Drives: 06 Z4M Roadster Join Date: Nov 2016 Location: Largo Fl iTrader: (0) Garage List 2006 Z4MR [0.00] 1972 For Sale Datsun [0.00] 2001 Dog/kayak haul ... [0.00] 2010 Daily Driver H ... [0.00]	Mine did it by clamping and keeping the hose high, no bleeding needed. How do you like the feel ? I haven't had much seat time since the mods...working is interfering with my fun, then GF ( live in ) got real sick this last weekend, so I had to play nurse. This weekend is supposed to be perfect for the vert. Sunny 80* ! I'm wondering how the heat of of the impending Summer will effect my enjoyment. I'm right between St Pete and Clearwater on the coast. Spring break beach driving has some real nice "views" lately. I'll probably do more night/early AM driving once it really gets hot __________________ Topless and getting my degree
	Appreciate 0 Quote

03-30-2017, 02:51 PM	#63
XMetal Colonel 1127 Rep 2,861 Posts Drives: Anything Join Date: Apr 2010 Location: SoCal iTrader: (0) Garage List 2008 Z4M Coupe [10.00] 2018 Audi S3 [0.00] 2004 X5 [8.50]	My indy is very meticulous. He wanted to bleed the slave cylinder properly so there is no if and or buts about the clutch pedal feel afterward - I won't argue with that. I haven't had much seat time in mine either since a few short drives yesterday, but the difference could be felt immediately. The engagement point is much more precise. I don't have to concentrate too much on releasing the latter half the clutch to be smooth anymore. Hope to get more seat time this weekend, if other activities doesn't get too much in the way.
	Appreciate 1 JJZ4MR30.00 Quote

03-30-2017, 03:18 PM	#64
G80indy Save the Manuals 1714 Rep 2,937 Posts Drives: Z3, E46, G80 Join Date: May 2005 Location: Indy iTrader: (0)	Plus the benefit of less clutch wear __________________ 2023 G80 6MT, CCBs 2002 330i Dinan, 5MT 2000 Z3 Conforti, 5MT
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03-30-2017, 04:43 PM	#65
JJZ4MR Private First Class 30 Rep 194 Posts Drives: 06 Z4M Roadster Join Date: Nov 2016 Location: Largo Fl iTrader: (0) Garage List 2006 Z4MR [0.00] 1972 For Sale Datsun [0.00] 2001 Dog/kayak haul ... [0.00] 2010 Daily Driver H ... [0.00]	Do you guys have a Clutch Stop ? For $10 it's a great mod. I'm going to get around figuring how to move the magnetic mechanism, so I can go with a bit less travel AND be able to start the car....I feel like I could still get 3/4 of an inch or so less travel. I actually would like EVERY BIT of fluid in the car, flushed and refilled. Didn't know there was a "special" slave tool needed. Diff/Tranny with Dimple magnetic plugs is in my " SOON TO DO" list __________________ Topless and getting my degree
	Appreciate 0 Quote

03-30-2017, 10:59 PM	#66
XMetal Colonel 1127 Rep 2,861 Posts Drives: Anything Join Date: Apr 2010 Location: SoCal iTrader: (0) Garage List 2008 Z4M Coupe [10.00] 2018 Audi S3 [0.00] 2004 X5 [8.50]	I did the ebay clutch stop as soon as I heard about it. I set mine about a 1/4 inch from the relay switch trigger, which leaves about 3/4 of an inch of travel (from the stop) before the clutch engage. This left enough margin to safely start everytime - never had a starting issue. Here's a home made slave cylinder bleed tool => http://www.bimmerfest.com/forums/sho...d.php?t=414188 The BMW "special" tool that I saw my indy use looked similar, but easier to operate.
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