Looking for Testarossa suspension motion ratio | FerrariChat

Looking for Testarossa suspension motion ratio

Discussion in 'Boxers/TR/M' started by anton1932, May 6, 2024.

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  1. anton1932

    anton1932 Rookie

    Jan 11, 2023
    11
    Full Name:
    Anton Danilovich
    Hey guys. I need to know the suspension motion ratio for my 1990 Testarossa. I'm working with JRI on a custom coilover kit, and they need this info. I've been able to fund such dates for 348 and 355's but not a Testarossa.
     
  2. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    9,528
    southwest Germany, France ( Alsace ) and Thailand
    Full Name:
    romano schwabel
    what you understand under this?
    please post this what you mean from a 348 what you found
     
  3. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,799
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    Suspension motion ratio (for a coilover design where the spring deflection is the same as the shock deflection) = wheel deflection/spring deflection (or spring deflection/wheel deflection)

    Never had a need to look at this in great detail, but doing an approximation from the suspension drawings in the TR WSM:

    TR front wheel deflection/spring deflection = 1.41

    TR rear wheel deflection/spring deflection = 1.35

    The TR WSM only shows the earlier single-lug suspensions. Don't know if the later 5-lug suspensions are exactly the same, or not, but they should be very similar (if not identical). And remind them that there are two coilover assemblies at each rear wheel ;).
     
  4. anton1932

    anton1932 Rookie

    Jan 11, 2023
    11
    Full Name:
    Anton Danilovich
    Thank you so much. That's exactly what I needed.
     
  5. Tim Rogers

    Tim Rogers Rookie

    Jun 6, 2019
    15
    Full Name:
    Timothy Rogers
    be aware that a German owner fitted new KW coil overs to his testarossa spent a chunk of money testing it on a 4 poster rig. Set up was horrendous as in , over sprung abd under damped when they did wind up the rebound and compression it was un useable. He went back to the original Koni set ups
     
  6. fatbillybob

    fatbillybob Two Time F1 World Champ
    Consultant Owner

    Aug 10, 2002
    28,997
    socal
    That's because someone did not do their homework. Number 1 rule of suspension is it's all a compromise. Empirical suspension 1st set up is a math problem tweeked on a race track for those of us who race. It is even more work to set up for different tracks. For all road it is super hard.
     

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