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308 suspension spring

Discussion in '308/328' started by johnvwatts, Oct 24, 2010.

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  1. johnvwatts

    johnvwatts Formula Junior

    Jul 7, 2007
    522
    England
    Full Name:
    John v watts
    #1 johnvwatts, Oct 24, 2010
    I am trying to find the original spring lbs for my gt4. The workshop manual says colour coding shows the poundage but doesn't say what each colour means. Mine are white coded. Any ideas ? Would guess around 200lbs?
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,826
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #2 Steve Magnusson, Oct 24, 2010
    Last edited: Oct 24, 2010
    The front spring rate given in the 110/75 308GT4 WSM is "mm./kg. 0,32" (page F4) = 175 lbs/in

    The rear is "mm.kg. 0,3" [sic] (page G4) = 186 lbs/in

    but not sure if that applies to all year & version 308GT4 (but you are in the right ballpark).

    The colour-coding is not for spring rate (although all springs will have some variation in rate). What's more important to the car maker is the "spring length at rated static load" so the coachwork sits level side-to-side -- and, I believe, that's what the colour-coding is used to indicate so they get a matched pair of the same length.
     
  3. johnvwatts

    johnvwatts Formula Junior

    Jul 7, 2007
    522
    England
    Full Name:
    John v watts
    #3 johnvwatts, Oct 24, 2010
    Last edited: Oct 24, 2010
    Fantastico. Thanks for the prompt reply Steve. Point noted about the colour coding.
     
  4. Hans

    Hans F1 Veteran

    Feb 17, 2006
    7,734
    Hilversum, Netherlands
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    Hans Teijgeler
    #4 Hans, Oct 24, 2010
    Having found this out, throw this info out of the window and go with 300/300 front/rear. MUCH better ride that way!
     
  5. johnvwatts

    johnvwatts Formula Junior

    Jul 7, 2007
    522
    England
    Full Name:
    John v watts
    #5 johnvwatts, Oct 24, 2010
    Indeed Hans thats exactly what I intend to do! Just need the poundage of the existing so that the new springs can be made to the correct height also allowing the ride height to be dropped an inch or so to acheive the look of your car. The new (say 300lb) springs will I recon need to be about 2inches lower to accomodate this but the spring manufacturer is going to work out the new length with the data of current free length, fitted length, ride height reduction and current and new stiffness.
     
  6. chrismorse

    chrismorse Formula 3

    Feb 16, 2004
    2,150
    way north california
    Full Name:
    chris morse
    #6 chrismorse, Oct 24, 2010
    Hi John,

    Are you going to retain the stock Konis?? If so, I'd be a bit cautious with the amont of reduced spring height because it is easy to go to low and high center/ bottom out/ have a tire hit the fender on turning into a driveway, particularly if you have changed from stock wheels/tires.

    If you are using QA-1s or other adjustable spring perch height shocks, no problem, you can just crank it up a bit.

    HTH,
    chris
     

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