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    spring rates..

    i just bought ground control coilovers....what is the spring rate? i got the one where it says it fits the stock, konis, and tokico shocks. anybody know the spring rate? planning to change to a higher rated spring just curious of what the regular ground control springs have. thanks!

    #2
    Originally posted by SLEEPERracer
    i just bought ground control coilovers....what is the spring rate? i got the one where it says it fits the stock, konis, and tokico shocks. anybody know the spring rate? planning to change to a higher rated spring just curious of what the regular ground control springs have. thanks!
    The numbers on the side somehow correspond to the rates - someone here who has them already should be able to tell you if you can post the numbers.

    The GCs come with any of dozens of rates.
    Current Cars
    2014 M235i
    2009 R56 Cooper S
    1998 M3
    1997 M3

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      #3
      There is no standard rate.

      As Dave said, post the numbers and we can tell you.

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        #4
        well theres two #'s on both spings il just post both

        front- 162852
        GC150.64.66

        rear- 145389
        GC140.64.83

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          #5
          Originally posted by SLEEPERracer
          well theres two #'s on both spings il just post both

          front- 162852
          GC150.64.66

          rear- 145389
          GC140.64.83
          The numbers on the GC springs are in metric, so here is the conversion:

          Front: 6" spring height, 2.5" spring diameter, 375lb/in spring rate

          Rear: 5.5" spring height, 2.5" spring diameter, 475lb/in spring rate
          ~ Go Canucks Go! ~

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            #6
            Originally posted by royalflush313
            The numbers on the GC springs are in metric, so here is the conversion:

            Front: 6" spring height, 2.5" spring diameter, 375lb/in spring rate

            Rear: 5.5" spring height, 2.5" spring diameter, 475lb/in spring rate
            cool! thanks!

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              #7
              Spring rates and wheel rates.

              The calculated wheel rates for an E30 are .94 for the front and .67 for the rear.
              375 X (.94)=352
              475 X (.67)=318
              Using the wheel rate rather than the spring rate allows comparisons between cars and eliminates any confusion as to the rear of an E30 being sprung "stiffer" than the front. Although the rear has a stiffer spring, the actual wheel rate is less than the front.

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                #8
                Originally posted by 1991 318is
                The calculated wheel rates for an E30 are .94 for the front and .67 for the rear.
                375 X (.94)=352
                475 X (.67)=318
                Using the wheel rate rather than the spring rate allows comparisons between cars and eliminates any confusion as to the rear of an E30 being sprung "stiffer" than the front. Although the rear has a stiffer spring, the actual wheel rate is less than the front.
                i was curious what are wheel rates were for the e30....

                thanks!

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                  #9
                  Wheel rates

                  I got the info from here:
                  http://e30m3performance.com/tech_art.../eff_rate2.htm
                  Actually , the author says the way I have done it for years is wrong. That I was calculating the motion ratio of the wheel to the spring and not the actual spring rate of the wheel. I sort of agree with him but honestly I don't really know. Maybe someone here knows enough to tell.
                  Wheel rate the author's way:
                  375 X (.88)=330
                  475 X (.45)=213
                  Last edited by 1991 318is; 01-06-2006, 09:30 PM.

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                    #10
                    the effective wheel rate is the right one. i read it today on bimmerforums and the club racers there would know.

                    Bimmerforums is the preferred online BMW Forum and community for BMW owners. At Bimmerforums, you will find technical how-to information maintenance specifics audio advice wheel and tire combinations and model specific details not found anywhere else. Our professionals are here to help make sure you find the answers you need to your questions and our community is here to help other brainstorm ideas for the future.


                    Motion ratios for an e36 are, Front: .94 spring and shock, Rear: 1.05 shock/.65 spring.

                    wheel rate = spring rate x (motion ratio)^2, wheel rate = spring rate x (.65)^2
                    or
                    wheel rate = spring rate x .46
                    Bimmerforums is the preferred online BMW Forum and community for BMW owners. At Bimmerforums, you will find technical how-to information maintenance specifics audio advice wheel and tire combinations and model specific details not found anywhere else. Our professionals are here to help make sure you find the answers you need to your questions and our community is here to help other brainstorm ideas for the future.

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