360spider F1 down shift issue | FerrariChat
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360spider F1 down shift issue

Discussion in '360/430' started by knocker, Sep 3, 2025 at 8:16 PM.

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  1. knocker

    knocker F1 World Champ

    Jul 10, 2017
    12,317
    Sydney Aus
    Full Name:
    Adrian
    #1 knocker, Sep 3, 2025 at 8:16 PM
    Hello folks, I’ve recently experienced an issue on down shift from 4th to 3rd, it hesitates on the down shift as if it can’t make up its mind and basically doesn’t like 3rd gear when hot, I think it’s the TCU but open to suggestions as there’s no faults and no engine/ gearbox light action, and the clutch is near new plus the actuator was refurbished at the same time I purchased the CS tcu so under 2 years old, thoughts?
    Regards Adrian OZ
     
  2. flash32

    flash32 F1 Veteran

    Aug 22, 2008
    7,042
    Central NJ
    Full Name:
    Dominick
    #2 flash32, Sep 3, 2025 at 8:24 PM
    Relearn
    Tight pis
    Bad EV valve ..not sure which ev1 or ev2
    Worn synchro

    Top four swags
     
    knocker and mvaldezf60 like this.
  3. andrejwolk1975

    andrejwolk1975 Karting

    Feb 28, 2020
    122
    Italy
    Full Name:
    Andrea M
    #3 andrejwolk1975, Sep 4, 2025 at 1:46 AM
    I could be wrong but if you hear sometimes a grinding noise while downshifting from 4 to 3 the problem is a synchromesh 100%.The 3rd and 4th ones are notorious for having issues.
    The F1 system slaps in the gears with little regard to a proper insertions and could be brutal in the long time for the synchromeshes.
     
    knocker likes this.
  4. flash32

    flash32 F1 Veteran

    Aug 22, 2008
    7,042
    Central NJ
    Full Name:
    Dominick
    #4 flash32, Sep 4, 2025 at 10:53 PM
    Ev1 controls the engagement

    Would like to add the most obvious one to the list which is to bleed the actuator
     
  5. knocker

    knocker F1 World Champ

    Jul 10, 2017
    12,317
    Sydney Aus
    Full Name:
    Adrian
    #5 knocker, Sep 5, 2025 at 2:57 AM
    many thanks flash I will try this first :)
     
  6. flash32

    flash32 F1 Veteran

    Aug 22, 2008
    7,042
    Central NJ
    Full Name:
    Dominick
    #6 flash32, Sep 5, 2025 at 3:05 AM
    Do the bleed and while actuator is off try the 4 to third downshift ..see if forks move correctly
    Also use your fingers change gear in transmission to see if anything is binding
    Put everything back to neutral before mounting
    Do the self learn process once attached
    What's your pis ?
     

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