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Thread: SIAP - manual transmission Clutch Delay Valve (CDV)

  1. #1
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    SIAP - manual transmission Clutch Delay Valve (CDV)

    curious if anyone knows.... does the 1.4T engine with C635 manual transmission have a clutch delay valve? If yes, the CDV would be located on the hose that goes from the clutch pedal to the bleed fitting at the trans. it could also be possible to find the CDV built into the clutch pedal assembly.

    why am i asking? the dart with same 1.4T and same C635 manual trans does in fact have a CDV built in. the X engine bay is really small and i have to wait until i have time to remove front bumper cover to see anything.

    what is a CDV? (credit dodge-dart.org and Deyeme Racing) The concept of a CDV is to help newbie drivers not "drop the clutch" or do anything else too suddenly that could damage the transmission. The way this is done is with a damper canister (the clutch delay valve), and clutch tubing with numerous coils and an oversized inner diameter to further "cushion" and "delay" the action from your foot to the clutch release bearing. In reality, this delay causes premature clutch wear (the only time the clutch is wearing is when it's partially engaged / disengaged, which the CDV extends every time you push and release the pedal). The delay also makes it impossible to shift gears at high speed, because even if your foot has hit the floor, the bearing is still working to release the clutch- then when you start bringing your foot back up, the clutch was never REALLY all the way down, and you get blocked from going into the next gear. As someone who loves spirited driving, and has years of experience driving cable and hydraulic clutch setups on the street and track, this shift delay is one of the most aggravating things for a daily driver.


    if the CDV is found to be present and deleted, the feeling that you get once the CDV is gone is amazing! CDV delete has been proven successful by the dart community, VW, BMW.... The CDV delete is a solution to a squishy clutch pedal, jerky launches, and difficult quick shifting. No more waiting for the clutch to release completely when you want to take off from the line! No more sloppy shifts! You will have complete control over you transmission like you are supposed to have with a manual trans!

    Thanks in advance if anyone can shed any light.
    FIAT 500X 1.4T 6MT. Assembled in a plant. Made in my Garage!

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  2. #2
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    crickets eh? LOL
    FIAT 500X 1.4T 6MT. Assembled in a plant. Made in my Garage!

    MODS:
    - Mopar Floormats @ 13 miles
    - 20% Window Tint @ 66 miles
    - KN filter @ 2215 miles
    - 16-inch Lightweight Wheels @ Coming May 2017
    - Short Stubby Antenna
    - Bright Pedal Kit
    - Side Window Air Deflectors
    - Lowering Springs
    - Short Throw Shifter
    - RRM Lightweight Pulley
    - Catted Downpipe w/ 2.5" outlet
    - Muffler Delete/Resonator Add
    - Second "ghost" exhaust tip
    - Fog Lights

  3. #3
    I'm stuck at work but will check it out when I get home late tonight.

    abarth500forum.com fiat124spiderforum.com fiat500lusaforum.com fiat500xforum.com

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    pkgmsu2000 (01-11-2017)

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    Senior Member aelfwyne's Avatar
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    Well, if it does have such a valve, it certainly doesn't affect the ability for me to drop the clutch and shred tires.
    2015 Rosso Abarth
    Mods: Ngen FMIC | El Gato Braces | GFB DV+ | Forge BOP | EC V4.1 Intake | NeuF Torque Arm Insert | ATM/Depo Boost Gauge | TWM Short Shifter | Brisk Plugs | MPX Hood Struts | Rally Armor Flaps | Okada Coils | CPR 30mm Rear Torsion Bar | Koni Yellow Rears | MPX Rear Exhaust | Chipbox | RRM Catted Downpipe | NGEN Performance Turbo by G-Pop

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    Senior Member Doohickie's Avatar
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    This is a very popular mod on MT Elantras from the mid-2000s. There was a DIY showing out to remove the damper orifice to provide better clutch feel (my Elantra was automatic).

  7. The Following 2 Users Say Thank You to Doohickie For This Useful Post:

    pkgmsu2000 (01-12-2017), PLP (01-12-2017)

  8. #6
    Yes, there is a damper listed inline with the supply line going to the slave cylinder.

    abarth500forum.com fiat124spiderforum.com fiat500lusaforum.com fiat500xforum.com

  9. #7
    Senior Member PLP's Avatar
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    Quote Originally Posted by Doohickie View Post
    This is a very popular mod on MT Elantras from the mid-2000s. There was a DIY showing out to remove the damper orifice to provide better clutch feel (my Elantra was automatic).
    It was a must in Elantra XD (mine was 2004). In HD (another I had was 2009) did not really need this mod. Clutch was very good, well comparing to XD.
    Then, Forte5 SX - it was very brisk. The damper was either very quick, or allowed for almost anything.
    2015 KIA Forte5 SX M/T (me)
    2016 FIAT 500X Trekking Plus AWD in Yellow... bumble bee (wife)

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    RoadRace Motorsports
    Quote Originally Posted by Fiat500USA View Post
    Yes, there is a damper listed inline with the supply line going to the slave cylinder.
    interesting, could you kindly post a schematic(s) and any kind of removal/replacement instructions if one had to do work in this area and/or replace supply line ;-)
    FIAT 500X 1.4T 6MT. Assembled in a plant. Made in my Garage!

    MODS:
    - Mopar Floormats @ 13 miles
    - 20% Window Tint @ 66 miles
    - KN filter @ 2215 miles
    - 16-inch Lightweight Wheels @ Coming May 2017
    - Short Stubby Antenna
    - Bright Pedal Kit
    - Side Window Air Deflectors
    - Lowering Springs
    - Short Throw Shifter
    - RRM Lightweight Pulley
    - Catted Downpipe w/ 2.5" outlet
    - Muffler Delete/Resonator Add
    - Second "ghost" exhaust tip
    - Fog Lights

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