99 355F1 does not down shift from 3 to 2 while driving | FerrariChat
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99 355F1 does not down shift from 3 to 2 while driving

Discussion in '348/355' started by yelcab, Jul 1, 2023.

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  1. yelcab

    yelcab F1 World Champ
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    Nov 29, 2001
    13,548
    San Carlos, CA
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    Mitchell Le
    #1 yelcab, Jul 1, 2023
    The 355F1 I am helping with has a shifting issue. It does not down shift to 2nd gear while moving. The pump is weak and comes on every shift so that is at least one problem. Needless to say, there is no SD2 around so I can't check leakage rate, system pressure, or anything else. This car has 120,000 miles on it with the original gearbox so who knows what else is worn out inside the box.

    I am thinking to replace the F1 pump (retrofit kit) and the accumulator (the bomb) and see how it goes. Anyone can think of anything else that can cause low system pressure?
     
  2. Qavion

    Qavion F1 World Champ
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    Feb 20, 2015
    14,264
    Sydney
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    Ian Riddell
    #2 Qavion, Jul 1, 2023
    Can the pressure switch give an impression that the pressure is low, therefore runs the pump continuously?

    Is there anything, specifically (mechanical), which would cause no problem with gearshift when stationary, but cause issues when the car is running, moving? Hopefully not sliders. They are hard to find, too.

    Are there any lights?
     
  3. Targatime

    Targatime Formula 3

    Feb 22, 2014
    1,449
    Los Angeles
    #3 Targatime, Jul 1, 2023
    Don't have any advice on the shifting problem, but pretty cool there's a 120k mile 355 out there. Still running on original engine or has it been apart before?
     
  4. yelcab

    yelcab F1 World Champ
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    Nov 29, 2001
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    Mitchell Le
    #4 yelcab, Jul 1, 2023
    Clutch does that. But, supposedly its clutch is newish. Although I think the pressure sensor should be replaced after 120,000 miles.
     
    Qavion likes this.
  5. yelcab

    yelcab F1 World Champ
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    Nov 29, 2001
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    #5 yelcab, Jul 1, 2023
    A few engine outs but never been apart (like a valve job). Although, I do smell it coming before too long.
     
    cavlino likes this.
  6. Targatime

    Targatime Formula 3

    Feb 22, 2014
    1,449
    Los Angeles
    #6 Targatime, Jul 1, 2023
    That's remarkable. Never thought a 355 could go 120k, or even close to it, on original guides.
     
  7. SeattleM5

    SeattleM5 Formula 3
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    Jul 9, 2006
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    Ettore Palazzo
    #7 SeattleM5, Jul 1, 2023
    Seems like you work on a lot of 355s, both manual and F1's. Ever thought about purchasing a Galileo tool specific the 355? I purchased one prior to embarking on my first engine out which included replacing the clutch. The tool is fantastic and interfaces with all the component ECUs on the 355.



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    JSBMD likes this.
  8. Uberpower

    Uberpower Formula 3
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    Feb 6, 2004
    1,115
    #8 Uberpower, Jul 9, 2023
    Same issue in normal and in Sport mode?
     
  9. yelcab

    yelcab F1 World Champ
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    #9 yelcab, Jul 9, 2023
    Either mode.
     

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