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  • ground control sleeves

    I just went to put my koni yellows and ground controls on today and the ground control sleeps and the springs that were sent there are two longer ones and two shorter ones on the springs. I figured that the shorter ones were for the front but when i put them on the car just sat on the strut and the spring/coilover sleeve was doing nothing? any input would be appreciated. unless the front ones are suppose to be the longer of the springs. heres a picture of the springs to show what im talking about.

    http://www.facebook.com/media/set/?s...type=1&theater

  • #2
    The GC kit comes with short springs anyway (shorter than I would use anyway). I think it's a 6" up front, 5" in the rear?

    What are the spring rates? The higher rate goes up front.

    GC spring part numbers should be GCxxx.yy.zz

    xxx = length in mm
    yy = spring rate in kg/mm (multiply by 56 to get lbs/in, note rate doesn't have a decimal, so 92 = 500 lb/in).
    zz = ID of spring in mm, 64 mm = 2.5"
    '18 Chevrolet Volt - Electric fun hatch for DD duty!


    DefSport Koni Sleeve and Spring Perch Buy!!!
    http://www.nissanroadracing.com/showthread.php?t=5902

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    • #3
      I prefer to reverse the sleeves as well, and run the 4" in front/2.5" in the rear.
      Between rides...unless you count a WD21...

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      • #4
        I did the same with the Richard housings (long in front, short in back, like a reverse mullet).

        with 7" springs the front collars sit right in the middle of the height range on the front but are maxed out at the bottom of the range on the back at full droop.

        I might have to go to 6" springs to be able to lower the rear of the car more.
        The Nerd shall inherit the podium for knowledge is power.

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        • #5
          I was JUST talking about this with PJ. That Bilstein front /Koni rear GC kit with Richard seems to be in a similar boat as far as spring & ride height. On 18" wheels, I have the front maxed all the way to top, and the rears slammed to the bottom to get the car (to appear) level.

          It feels a little bouncy, which I was/am under the impression that the fronts have more of a limited ability now to compress enough before the spring reacts while the rears may be traveling much more. I'll quote him if it's ok
          I would think that the Bilsteins have pretty low compression damping, but I'd guess a gas charged monotube has higher internal pressure than the twin tube, which may make it seem like you have a higher "spring" rate (only a guess).
          I may pick up a set of shorter springs for the rear.
          97 Kouki SR 240

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          • #6
            Pic didn't work for me either btw.
            Between rides...unless you count a WD21...

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            • #7
              how does spring length affect performance?

              BTW ground control spring numbers are like this...

              GC XXX.YYY.ZZZ

              x=length (inches X 100)
              y=diameter (inches X 100)
              z=rate (lbs/in)

              example... 0600.250.0900
              6 inches long, 2.5 inch ID, 900lbs/in rate

              **actually the 'GC spec springs' are listed as Def said... the Eibach springs are like I just stated...
              Last edited by spent; 05-13-2011, 06:21 PM.

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              • #8
                You want to have shock travel sufficient for the greatest travel required, and never coilbind your spring. Both are bad bad bad.
                '18 Chevrolet Volt - Electric fun hatch for DD duty!


                DefSport Koni Sleeve and Spring Perch Buy!!!
                http://www.nissanroadracing.com/showthread.php?t=5902

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                • #9
                  I got it to work by having the taller springs up front and the lower springs in the rear but now every time i take a left turn theres a like clunking noise in the left front wheel area anyone know what this might be?

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                  • #10
                    You didn't put something together right.
                    jack up the car and start pulling and shaking on things and see what moves.
                    Originally posted by SoSideways
                    I don't care what color they are as long as they are LONG AND HARD.
                    '04 G35 Sedan 6MT- The DD
                    '96 240SX- The Track Toy

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                    • #11
                      Did you put any electrical tape, o-ring, etc in between the housing and GC sleeve?
                      Between rides...unless you count a WD21...

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                      • #12
                        no i didnt it seemed like a snug fit but maybe its a lil loose

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                        • #13
                          Originally posted by jc240sx90 View Post
                          no i didnt it seemed like a snug fit but maybe its a lil loose
                          It won't hurt anything w/o it. It can and will make a little noise though.
                          Between rides...unless you count a WD21...

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                          • #14
                            its not a little noise its a loud clunking noise lol

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                            • #15
                              That's not the sleeve then. Snap a pic of how you assembled it. (if you hadn't already taken one)
                              Between rides...unless you count a WD21...

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