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  1. #1
    VXRed DJC317's Avatar
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    14th March 2016
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    Lightbulb Clutch Delay Valve

    Hey everyone.

    Has anyone developed a braided clutch line or clutch delay valve to suit the Astra J VXR?

    Reason I ask, is that majority of modern cars clutch lines will have a clutch delay valve fitted. Having these fitted usually equates to a jerky gear change as the pressure of the clutch fluid has to pass through a small orifice, thus causing slow fluid return when lifting off the clutch pedal (hence the jerky gear change). Remembering back to driving older cars without these things fitted, the clutch pedal feeling was significantly more direct.

    The clutch delay valve is either the circled item in the following image attached to this post, or it may just be a small orifice insert inside of the clutch line elbow to the transmission. Will need to confirm this myself as i will be replacing my slipping clutch with a WGM stage 2 kit with SMF.

    2016 Holden Astra J VXR - Arden Blue

    Qualified Automotive Technician and aspiring Automotive YouTuber.
    CHECK OUT MY CHANNEL -> Diligent Garage

  2. #2
    VXRed blooded
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    13th October 2014
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    I'm not aware anyone has developed a braided clutch line or clutch delay valve to suit the Astra J VXR, but the circled item on your drawing may be a FTE vibration canceler,

    https://docs.google.com/viewer?url=p.../US6647722.pdf

    and from the drawing there appears there may be a frequency modulator on the master cylinder end of the same pipe,

    https://docs.google.com/viewer?url=p.../US7578378.pdf

    but there may be more than one type of these, so if you get the chance some photos especially of any manufacturers marks and part numbers on these items would be good, more info at,

    https://www.fte-automotive.com/filea...ere_en_web.pdf
    Last edited by Carbon Flash; 20th November 2017 at 01:55 PM.

  3. #3
    VXRed blooded
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    If the first part is a FTE item as mentioned, guess it may be possible to open it up, and measure and turn up a metal spacer on a lathe, maybe in aluminium something like at,

    http://4.imimg.com/data4/JH/XO/MY-12...rs-500x500.jpg

    to entirely take the place of the spring (22) at it maximum extension to stop the membrane (12) from moving, and if there was any removable parts in the item at the master cylinder end of the pipe restricting fluid flow, guess it might be possible to remove them and/or drill out any restricting orifice. Imagine the existing steel pipes and hard plastic casings of the existing parts should make the clutch at least as direct as a braided pipe.

  4. #4
    VXRed DJC317's Avatar
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    Quote Originally Posted by Carbon Flash View Post
    If the first part is a FTE item as mentioned, guess it may be possible to open it up, and measure and turn up a metal spacer on a lathe, maybe in aluminium something like at,

    http://4.imimg.com/data4/JH/XO/MY-12...rs-500x500.jpg

    to entirely take the place of the spring (22) at it maximum extension to stop the membrane (12) from moving, and if there was any removable parts in the item at the master cylinder end of the pipe restricting fluid flow, guess it might be possible to remove them and/or drill out any restricting orifice. Imagine the existing steel pipes and hard plastic casings of the existing parts should make the clutch at least as direct as a braided pipe.
    Lots of good information there mate. Would be a lot of work to get this setup correctly. They appear to have made this system a lot more complicated then I originally thought with that damper. A lot of the other ones have a small insert somewhere in the fluid line (refer image below, note that this image is from a VAG vehicle).

    I'm replacing my clutch very soon with a Stage 2 WGM kit with SMF so this will likely improve pedal feel a little bit. I will have a look at the connections to the gearbox and see if there is anything of that sort in there.

    CDV.jpg
    2016 Holden Astra J VXR - Arden Blue

    Qualified Automotive Technician and aspiring Automotive YouTuber.
    CHECK OUT MY CHANNEL -> Diligent Garage

  5. #5
    VXRed blooded
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    Thanks for posting the photo of the VAG CDV, its not something I have seen before.

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