1M CDV Delete/Mod

HALOTHANE · 07-13-2011, 03:13 PM

Has anyone modified their CDV on a 1M yet? If so, please post your driving experience.

PyratOne · 07-13-2011, 04:02 PM

Quote:

Originally Posted by 1MVO

Has anyone modified their CDV on a 1M yet? If so, please post your driving experience.

Am interested as well

hopofthese · 07-13-2011, 05:06 PM

night and day difference. I just tossed mine last week. shifting has definitely improved.

HALOTHANE · 07-13-2011, 06:25 PM

Quote:

Originally Posted by hopofthese

night and day difference. I just tossed mine last week. shifting has definitely improved.

Aside from shifting improvent, has the mod resolved the occassional rough or abrupt disengagement of the tranny during clutch-in while coasting in 1st at low rpm? It is often felt as a "thud" when shifting from 1st to neutral.

Franklin Joseph · 07-13-2011, 07:06 PM

Quote:

Originally Posted by 1MVO

Aside from shifting improvent, has the mod resolved the occassional rough or abrupt disengagement of the tranny during clutch-in while coasting in 1st at low rpm? It is often felt as a "thud" when shifting from 1st to neutral.

yes resolved (at least for me)

de85275 · 07-13-2011, 10:07 PM

Quote:

Originally Posted by hopofthese

night and day difference. I just tossed mine last week. shifting has definitely improved.

Did you buy an after market CDV or simply by-pass and remove the stock one? if that is possible...

Gtrain · 07-13-2011, 10:38 PM

Does this change the function of the hill assist where if you are on the brake and let go on a hill, the car will not roll for the first 1-2 seconds after you let off the brake?

Papethova · 07-14-2011, 12:17 AM

Quote:

Originally Posted by Gtrain

Does this change the function of the hill assist where if you are on the brake and let go on a hill, the car will not roll for the first 1-2 seconds after you let off the brake?

It does not affect hill assist

Dackelone · 07-14-2011, 01:42 AM

Quote:

Originally Posted by Papethova

It does not affect hill assist

+1. Everything works the same... just that there is no delay or jerkyness when you step on/off of the clutch pedal. This is really a must have mod for any 6MT BMW.

You can just unplug the CDV cartridge/tube and plug in the hydraulic line back together. But I ordered an extra CDV, took a 3mm punch and reamed out the CDV jet. Then I installed the "hollow" CDV in my car - for that stealth look. That way BMW can't say or notice a thing! The CDV is cheap at around $10 at your dealer.

see my post #97 and onwards...

http://www.1addicts.com/forums/showt...cdv+delete+diy

Dackel

hopofthese · 07-14-2011, 01:59 AM

Quote:

Originally Posted by de85275

Did you buy an after market CDV or simply by-pass and remove the stock one? if that is possible...

simply just removed it.

-pinched the line off to prevent fluid from coming out
-plug the line back in.
-bleed clutch.

MB38 · 07-14-2011, 02:08 AM

Is there a CDV FAQ or some thread I can read that describes what people are on about? It sounds like it's been an ongoing focus...

HALOTHANE · 07-14-2011, 07:45 AM

Quote:

Originally Posted by hopofthese

simply just removed it.

-pinched the line off to prevent fluid from coming out
-plug the line back in.
-bleed clutch.

I understand that pinching the flexible hose/line during the modification can cause damage to said hose and later cause leaks. Any experience?

135iUSN · 07-14-2011, 07:57 AM

^^ MB38

FAQ #1

(CDV) = Clutch Delay Valve

I had no clue....

PyratOne · 07-14-2011, 10:36 AM

http://www.zeckhausen.com/CDV.htm

as a start

"During normal, sedate driving, the shift from first into second gear is often jerky, leading passengers to question your skill. As the driver, you can see your passengers' heads bobbing back and forth during every shift! Yes, in their minds, they are laughing at you."

by the way this totally happend to me when I got my first bmw 6MT - my buddy's head bobbed, then he laughed his ass off. Of course I had no idea what was causing at the time. Thats my story and Im sticking to it

Papethova · 07-14-2011, 10:48 AM

Quote:

Originally Posted by Dackelone

took a 3mm punch and reamed out the CDV jet. Then I installed the "hollow" CDV in my car - for that stealth look. That way BMW can't say or notice a thing! The CDV is cheap at around $10 at your dealer.

Exactly what I did, 3 years later everything works perfectly. Never had an issue.

de85275 · 07-14-2011, 10:53 AM

Quote:

Originally Posted by Dackelone

..., took a 3mm punch and reamed out the CDV jet. Then I installed the "hollow" CDV in my car - for that stealth look. That way BMW can't say or notice a thing! The CDV is cheap at around $10 at your dealer.

Dackel

Which end do you stick the punch in? Or is it obvious once you have it out of the car? Thanks.

de85275 · 07-14-2011, 10:56 AM

Another thing, does the cdv action on the 1M feel the same as on a 135i? I drove a 135 on a 30 minute test drive and had no problem with clutch feel at all. If it's about the same I guess I won't even worry about it.

Dackelone · 07-14-2011, 11:13 AM

Quote:

Originally Posted by de85275

Which end do you stick the punch in? Or is it obvious once you have it out of the car? Thanks.

The bellow photo should show you which end to use the punch on... insert a 3mm punch (or the like) into the small end,.. then gently tap with a small hammer. The restrictor/jet will pop out. Then install your modified CDV.

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hopofthese · 07-14-2011, 11:43 AM

Quote:

Originally Posted by 1MVO

I understand that pinching the flexible hose/line during the modification can cause damage to said hose and later cause leaks. Any experience?

I've done it multiple times. Just don't pinch it too hard and don't use anything with a sharp tip to pinch it.

Dackelone · 07-14-2011, 11:50 AM

^^Actually... I used a special hose clamping tool(see my photos in the above CDV DIY link) on my CDV feed line... it did not stop teh flow of brake fluid at all. I think IF I had to do the install again... I would use a (short)rubber or clear hose zip-tied shut on one end and I would slip it over the hydraulic line that you unplug when you install the CDV. Brake fluid seems to really pour out - and brake fluid always feels so wierd on your skin/hands. My special crimp tool did not seem to work bc think the CDV's hydraulic feed line has a hard inner hose that can't be crimped.

de85275 · 07-14-2011, 01:04 PM

Quote:

Originally Posted by Dackelone

The bellow photo should show you which end to use the punch on... insert a 3mm punch (or the like) into the small end,.. then gently tap with a small hammer. The restrictor/jet will pop out. Then install your modified CDV.

Thanks, That looks easy enough, even for me. Refill clutch reservoir with brake fluid, yes?

hopofthese · 07-14-2011, 01:59 PM

Quote:

Originally Posted by Dackelone

^^Actually... I used a special hose clamping tool(see my photos in the above CDV DIY link) on my CDV feed line... it did not stop teh flow of brake fluid at all. I think IF I had to do the install again... I would use a (short)rubber or clear hose zip-tied shut on one end and I would slip it over the hydraulic line that you unplug when you install the CDV. Brake fluid seems to really pour out - and brake fluid always feels so wierd on your skin/hands. My special crimp tool did not seem to work bc think the CDV's hydraulic feed line has a hard inner hose that can't be crimped.

I had a very small amount of brake fluid leak out only. Car feels great now btw without that pesky CDV.

07-13-2011, 03:13 PM	#1
HALOTHANE First Lieutenant 36 Rep 391 Posts Drives: INTERLAGOS ZCP Join Date: Jun 2011 Location: Anywhere fast iTrader: (0) Garage List 1990 BMW L6 (retired) [0.00] 2010 BMW 135i M-Spo ... [0.00] 2011 BMW 1M (adopted) [0.00] 1990 MERCEDES 190E ... [0.00] 2012 BMW M3 [1.00]	1M CDV Delete/Mod Has anyone modified their CDV on a 1M yet? If so, please post your driving experience.
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07-13-2011, 05:06 PM	#3
hopofthese Private First Class 8 Rep 155 Posts Drives: E46 M3 & 11 1M Join Date: Jul 2008 Location: NYC iTrader: (2)	night and day difference. I just tossed mine last week. shifting has definitely improved.
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07-13-2011, 10:38 PM	#7
Gtrain Colonel 144 Rep 2,018 Posts Drives: something slowwwww Join Date: Mar 2006 Location: NYC iTrader: (21)	Does this change the function of the hill assist where if you are on the brake and let go on a hill, the car will not roll for the first 1-2 seconds after you let off the brake?
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07-14-2011, 02:08 AM	#11
MB38 [insert witty title here] 5 Rep 91 Posts Drives: '97 Supra TT, '11 1M Join Date: Jun 2011 Location: Burbank, CA iTrader: (0)	Is there a CDV FAQ or some thread I can read that describes what people are on about? It sounds like it's been an ongoing focus...
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07-14-2011, 07:57 AM	#13
135iUSN 19 X5 1998 M Roadster 64 Rep 1,503 Posts Drives: 135i Alpine White / Terra Join Date: Sep 2008 Location: SW Florida iTrader: (1) Garage List 1998 BMW M Roadster [0.00] 2009 135i [0.00]	^^ MB38 FAQ #1 (CDV) = Clutch Delay Valve I had no clue.... __________________ '09 135i Dinan In BMW heaven 09.28.2022 - Stage 2/Alpine White w/Terracotta /High Gloss Black Trim/ZCW/ZPP/ZSP w/313's /CA/PDC/Steptronic/
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07-14-2011, 10:36 AM	#14
PyratOne Lieutenant 21 Rep 436 Posts Drives: 1M Coupe (Not an M1!) Join Date: Jun 2010 Location: MA iTrader: (0)	http://www.zeckhausen.com/CDV.htm as a start "During normal, sedate driving, the shift from first into second gear is often jerky, leading passengers to question your skill. As the driver, you can see your passengers' heads bobbing back and forth during every shift! Yes, in their minds, they are laughing at you." by the way this totally happend to me when I got my first bmw 6MT - my buddy's head bobbed, then he laughed his ass off. Of course I had no idea what was causing at the time. Thats my story and Im sticking to it __________________ “Balancing this thing on the steering and throttle is pretty much the crack cocaine of the car world.” Top Gear Magazine - Jason Barlow about the 1M
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07-14-2011, 10:56 AM	#17
de85275 Second Lieutenant 35 Rep 217 Posts Drives: Valencia Orange 424/740 Join Date: Mar 2011 Location: Delaware iTrader: (0) Garage List 2015 BMW X4 35i [0.00] 2014 Jeep JKU Rubicon [0.00] 2011 BMW 1 Series M [0.00]	Another thing, does the cdv action on the 1M feel the same as on a 135i? I drove a 135 on a 30 minute test drive and had no problem with clutch feel at all. If it's about the same I guess I won't even worry about it.
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07-14-2011, 11:50 AM	#20
Dackelone European Editor 10539 Rep 22,992 Posts Drives: N54 e82 Join Date: Feb 2010 Location: Bayern, Germany iTrader: (1)	^^Actually... I used a special hose clamping tool(see my photos in the above CDV DIY link) on my CDV feed line... it did not stop teh flow of brake fluid at all. I think IF I had to do the install again... I would use a (short)rubber or clear hose zip-tied shut on one end and I would slip it over the hydraulic line that you unplug when you install the CDV. Brake fluid seems to really pour out - and brake fluid always feels so wierd on your skin/hands. My special crimp tool did not seem to work bc think the CDV's hydraulic feed line has a hard inner hose that can't be crimped.
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