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  • Rear Roll Center Correction

    Not sure if that is the right title but thought this might be interesting to some of you guys. It isn't really roll center correction but it allows you to get your car lower while maintaining stock roll center sooo. I raised it 1.125".


    Last edited by logr; 01-01-2012, 10:29 AM.

  • #2
    That is some serious stuff right there. Made your own drop spindles?
    Originally posted by Matt93SE
    in engrish, it's all about the length of your shaft... :P

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    • #3
      O_O, that must have taken a lot of work.

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      • #4
        That's exactly what PBM did for rear knuckles except they made there's out of Cut metal plates instead of Modding the stock knuckle like yours. Though PBM only did 1"/25mm.

        Looks good. How long did it take for that?

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        • #5
          Man it's great to see we got some adventurous experimenters around here!
          Don Johnson (really!)
          Just so you know.

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          • #6
            Looks great may have to do this

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            • #7
              I've been thinking of doing this exact same thing. Glad to see someone else tackle it first.
              My Blog | Unfriendly Garage | Endurance Motorsports

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              • #8
                One of the stock caliper mounts can be kept which helps with the caliper tremendously. My guy didn't understand that and cut them off. Oh well. I checked my notes and I ended up 1.125" higher than stock. I thought it was a good idea and it worked well but the machining was way more expensive than quoted.

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                • #9
                  Originally posted by logr View Post
                  One of the stock caliper mounts can be kept which helps with the caliper tremendously. My guy didn't understand that and cut them off. Oh well. I checked my notes and I ended up 1.125" higher than stock. I thought it was a good idea and it worked well but the machining was way more expensive than quoted.
                  That's usually how machine shops like to operate isn't it?
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                  • #10
                    This is indeed cool stuff but makes for another question about roll-axis inclination. I understand the general rule is that it should be pointing downward toward the front but I also think we generally agree the 240sx stock chassis has too much roll-axis inclination. Have we ever found or determined the roll-centers for the front and rear of the stock chassis? I know there's several ways to correct the front, but if we're going to correct the rear as well wouldn't it be appropriate to take into account how it affects roll-axis inclination?
                    Don Johnson (really!)
                    Just so you know.

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                    • #11
                      nice never seen this done b4.

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                      • #12
                        Originally posted by djsilver View Post
                        This is indeed cool stuff but makes for another question about roll-axis inclination. I understand the general rule is that it should be pointing downward toward the front but I also think we generally agree the 240sx stock chassis has too much roll-axis inclination. Have we ever found or determined the roll-centers for the front and rear of the stock chassis? I know there's several ways to correct the front, but if we're going to correct the rear as well wouldn't it be appropriate to take into account how it affects roll-axis inclination?
                        The rear roll center drops way slower than the front when you lower the car. I think pushing up the subframe to the frame makes for a pretty good amount of RC correction in the rear for most cars.

                        The front needs a decent amount of correction for even moderate lowering, and even then it's probably below the rear's height with pulling the subframe up.
                        '18 Chevrolet Volt - Electric fun hatch for DD duty!


                        DefSport Koni Sleeve and Spring Perch Buy!!!
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                        • #13
                          I wonder if I did this I f it would create more room for a brake caliper at a reasonable diameter....DEF figure that out
                          I am SKULLWORKS

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                          • #14
                            I'm thinking no. If anything it'd give you more space if you dropped it down 1" and could get some of the caliper below the upright(maybe we can market it as super camber gain kit??? ). It's way too tight up top since the traction arm is sticking way out there.
                            '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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                            • #15
                              Originally posted by Def View Post
                              The rear roll center drops way slower than the front when you lower the car. I think pushing up the subframe to the frame makes for a pretty good amount of RC correction in the rear for most cars.

                              The front needs a decent amount of correction for even moderate lowering, and even then it's probably below the rear's height with pulling the subframe up.
                              Can't move the subframe up in "SM".

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