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Thread: Remove Clutch Delay Valve?

  1. #1
    Join Date
    Dec 2012
    Location
    Palm Beach County, FL
    Posts
    212

    Remove Clutch Delay Valve?

    I'm not the best shifter but I know if I lift the clutch at about 2500 or 4800 my shift is smoother than anywhere else but I feel like that shift point is tiny, so little margin for error... If not perfect, it shudders. In the past when my clutch was blown on my E36 I even was able to shift without the clutch, which was very cool BTW.

    Then
    I read this were I saw a video:

    BMW*have used clutch delay valves on the*E39*and*E46*models, and others, from 1997. These valves have been unpopular with some drivers and they are sometimes removed to leave a conventional clutch action.*The BMW valve is a separate pipe fitting and easily removed.

    So bottom line, will removing this slow down the RPM decrease after letting of the gas and give me more margin or....

    Sent from my ONEPLUS A6013 using Tapatalk
    __________________________________________________ ____
    2003 ZHP 4dr | 145,000 miles (ACTUAL before RIP) | BBS 17"
    Hankook Ventus V12
    Front: 225/45ZR
    Rear: 255/40ZR-17 Hankook Ventus V12 evo2 XL
    [ Staggered on square (17x8.5 +38) ]

  2. #2
    Join Date
    Jul 2011
    Location
    Houston, TX
    Posts
    2,367
    CDV delete is a very common mod and should only improving your shifting. an alternative is to install a "unlock" valve which keeps the part, but opens up the fluid flow: https://www.ecstuning.com/b-uuc-part...QaAk4TEALw_wcB

    here's a good DIY:

    https://www.e46fanatics.com/threads/...h-pics.763107/
    --Wes--

    04 330i ZHP Oxford Green/Natural Brown
    04 330Ci ZHP Silvergrey/Alcantara (RIP)

  3. #3
    Join Date
    Nov 2016
    Location
    Charlotte, NC
    Posts
    2,770
    Yep and the replacement part that ECS and the like sell is 100% unnecessary

  4. #4
    Join Date
    May 2020
    Location
    Toronto, ON
    Posts
    277
    Quote Originally Posted by ZHPizza View Post
    Yep and the replacement part that ECS and the like sell is 100% unnecessary
    Lol I find it pretty funny that the bored-out CDV is still being sold. Who would buy them, I guess some schmuck who has not done their research? They were only made so that when the cars were still in the warranty period, it wouldn't be voided
    2004 BMW 330CI ZHP (well, technically ZAM)


  5. #5
    Join Date
    Jun 2012
    Location
    Socal
    Posts
    1,248
    To actually answer your question, no it won't affect the rate the RPMs drop at. But it'll let you engage the clutch a bit faster. You just get slightly more control of the clutch.

  6. #6
    Quote Originally Posted by ZHPizza View Post
    Yep and the replacement part that ECS and the like sell is 100% unnecessary
    +1, when I had my ZHP I had mine removed.

    Quote Originally Posted by sillieidiot View Post
    To actually answer your question, no it won't affect the rate the RPMs drop at. But it'll let you engage the clutch a bit faster. You just get slightly more control of the clutch.
    +1

  7. #7
    Join Date
    Oct 2016
    Location
    Vermont
    Posts
    519
    I removed mine on my ZHP and my 330xi DD, and my clutch action in both cases was significantly better.
    2004 BMW 330i ZHP (52k miles), Jet Black with black leather, MFactory LSD (3.38) with Z4 cover, 18"x8.5" ET38 APEX Arc-8's (Anthracite) with 245/40 Michelin PSS', Koni Sports with factory springs and front and rear reinforcement plates, Shark Injector, Corsa TSE3 cat-back exhaust, TMS under-driven pulleys (water & steering), CDV delete, TMS CF strut brace, K&W CAI, GAS DISA rebuild, TMS pedals, Wheelskins steering wheel cover, roller tray center console, black-out grilles, and WeatherTech mats

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