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F355 Swiss Gearbox

Discussion in 'Technical Q&A' started by charleswan, Jan 7, 2004.

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  1. charleswan

    charleswan Rookie

    Dec 22, 2003
    40
    Hong Kong
    Full Name:
    Charles Wan
    #1 charleswan, Jan 7, 2004
    Does anyone know if the Swiss version have a different gearbox ratio ? Someone told me that it has a different ratio, a shorter that is.
     
  2. Ferrari_tech

    Ferrari_tech Formula 3

    Jul 28, 2003
    1,527
    UK
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    Malcolm W
    #2 Ferrari_tech, Jan 7, 2004
    As far as I can recall there are no differences in gear ratios between Swiss / US or Euro 355's

    MW
     
  3. Mitch Alsup

    Mitch Alsup F1 Veteran

    Nov 4, 2003
    9,357
    #3 Mitch Alsup, Jan 7, 2004
    one piece of the gearing was changed in the swiss transmission giving more TQ multiplication to make up for the altitude.

    The toatl drive ratio of the F355 is 4.35 +/- while the swiss drive ratio is about 4.5 +/-
     
  4. charleswan

    charleswan Rookie

    Dec 22, 2003
    40
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    Charles Wan
    #4 charleswan, Jan 7, 2004
    Do you know if we could just change that specific gear ? Or we'll have to change the whole gearbox ?

    Where can I get this part ?
     
  5. Mitch Alsup

    Mitch Alsup F1 Veteran

    Nov 4, 2003
    9,357
    #5 Mitch Alsup, Jan 7, 2004
    Ferrari service manual

    World crown gear 25:29 (1.160)
    Swiss crown gear 25:27 (1.080)
    Swiss 6th gear 36:31 (0.861)
    World 6th gear 37:31 (0.837)
    All the other gears are the same.

    So the swiss ratio change (spur gear) lowers performance compared to the world cars.
     
  6. charleswan

    charleswan Rookie

    Dec 22, 2003
    40
    Hong Kong
    Full Name:
    Charles Wan
    #6 charleswan, Jan 7, 2004
    Mitch,

    Will you consider that a significant change ? Although it reduces the top speed but it gets to the rev much quicker right ?

    Just like changing the final drive on other cars.

    4.35 to 4.5 may not seem too significant.
     

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  7. Mitch Alsup

    Mitch Alsup F1 Veteran

    Nov 4, 2003
    9,357
    #7 Mitch Alsup, Jan 8, 2004
    [No, what I said in the post with actual data is that the swiss gearbox reduces performance, in effect going from 4.35 to 4.15 not the other way around. Aparently this was done for noise reasons not for performance reasons.

    That is; slower 0-60, slower 0-100, slower, slower, slower!
     

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