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Definitive Adjustable Trailing Arm Thread

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  • #76
    Well this isn't a great picture but here is a shot of the semi trailing arms on my 2002 race car.

    Because we race it is different classes on the same race weekend we need to swap camber settings very quickly (10 minutes usually for fuel, tires and camber changes at all 4 corners) toe rarely changes and while it is dependent on camber the effect is not as great as we though (we degree'd the suspension while doing a full compression of the rear shocks). There is no rubber in the suspension anywhere so this helps....this is not your grandmothers suspension.

    So given that toe rarely needs to change we did not focus on making this very easily adjustable (takes about 20 minutes to change both sides).



    Basically the adjuster portion is a plate of solid tool steel that was machined to accepts a 1/2 aurora rod end and the 4 bolts on the other side. as the plate slides up ad down camber is changed from -4.5 max to +0.5. The plates are notched and we take measurements with a vernier every race weekend to check that the indexes are correct....it never changes.

    This winter I may incorporate an e30 subframe and 188mm diff and if I do so I will make new trailing arms but incorporate the adjuster system ....it is way too easy.

    Anthony

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    • #77
      Turbo ///M3 and UweM3 any update guys? I am interested on these.
      Motornuts, what did you do with your car today?

      My projects:
      http://beta.motornuts.com/scaraveos/MR2-Spyder
      http://beta.motornuts.com/scaraveos/BMW-E30
      http://beta.motornuts.com/scaraveos/EP82

      Comment


      • #78
        Originally posted by scaraveos View Post
        Turbo ///M3 and UweM3 any update guys? I am interested on these.
        My engine is blown up, so priority changed slightly :sosad:
        I have forwarded my CAD files to a friend in Germany and he is working on it.


        Goodbye M3, you served me well.

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        • #79
          Sorry for your engine mate :( My engine blown too!

          Got any ETA for the situation? I am thinking in buying muzzimotorsport parts but if your setup will end soon I can wait!
          Motornuts, what did you do with your car today?

          My projects:
          http://beta.motornuts.com/scaraveos/MR2-Spyder
          http://beta.motornuts.com/scaraveos/BMW-E30
          http://beta.motornuts.com/scaraveos/EP82

          Comment


          • #80
            I bought camber/toe adjusters from Booker, and I am just trying to come up with someone to do the fabricating and welding to incorporate them into the trailing arms.

            I am wrestling also, with whether rod ends will have an acceptable life on a dual purpose street/track car. The jury is still out on that one. If they start clacking after a month, that would be bad.......

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            • #81
              Originally posted by Ironhead View Post
              I bought camber/toe adjusters from Booker, and I am just trying to come up with someone to do the fabricating and welding to incorporate them into the trailing arms.
              What kind of adjusters are they? Any picture?
              Motornuts, what did you do with your car today?

              My projects:
              http://beta.motornuts.com/scaraveos/MR2-Spyder
              http://beta.motornuts.com/scaraveos/BMW-E30
              http://beta.motornuts.com/scaraveos/EP82

              Comment


              • #82
                Originally posted by scaraveos View Post
                What kind of adjusters are they? Any picture?
                Go back and read the whole thread, there are pictures.
                sigpic
                Track Car Build | COM Sports Car Club

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                • #83
                  Originally posted by Ironhead View Post
                  I bought camber/toe adjusters from Booker, and I am just trying to come up with someone to do the fabricating and welding to incorporate them into the trailing arms.
                  Did Mike make those up for you or were they spares he had laying around?

                  Mike

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                  • #84
                    Originally posted by Brendan View Post
                    Go back and read the whole thread, there are pictures.
                    I have read all the thread seveeral times but I don't know what type of adjustors IronHead got as there are 2 different setups there? MozziMotorsport, Uwe's, Turbom //MAN?
                    Motornuts, what did you do with your car today?

                    My projects:
                    http://beta.motornuts.com/scaraveos/MR2-Spyder
                    http://beta.motornuts.com/scaraveos/BMW-E30
                    http://beta.motornuts.com/scaraveos/EP82

                    Comment


                    • #85
                      Originally posted by scaraveos View Post
                      I have read all the thread seveeral times but I don't know what type of adjustors IronHead got as there are 2 different setups there? MozziMotorsport, Uwe's, Turbom //MAN?
                      If you read more carefully, He said he got them from Booker.

                      Originally posted by Ironhead View Post
                      Hey dudes......

                      I am trying to figure out a source for these thingys. (thanks Booker for the pics I "borrowed") They are used on the DTM trailing arms to allow a rod end to adjust for camber and toe without being unbolted and "turned".

                      Does anyone know if they are a BMW Motorsport specific part, or a generic item used in other motorsport venues?

                      Thanks!




                      sigpic
                      Track Car Build | COM Sports Car Club

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                      • #86
                        Originally posted by empty View Post
                        Did Mike make those up for you or were they spares he had laying around?

                        Mike


                        He had them made. He designed them for his own use, but the machine shop kept the stats.

                        They are well designed, and will definitely do the job. They seem a little heavy at first, but if you compare them to the total weight of the trailing arms with hubs, brakes, etc attached, the weight is insignificant.

                        These adjusters take a 1/2" rod end. I am planning to use a 1/2" sperical bearing on the inner pivot. There are assorted little design details to be resolved, and I need to find someone I trust to do the work, but none of this is rocket science. As I said, my only concern right now is related to the life span of these parts. My car is still driven on the street, and I certainly do not want to constantly be changing rod ends and bearings. If I could get a year out of them, I think I could live with that. Anyone had experience using these parts on dual purpose cars?

                        Turbo///M3 had expressed an interest in selling his setup, but I PMed him and got no response, so I presume he changed his mind.......

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                        • #87
                          Oh, I'm sorry for not answering you. Haven't been here in a while. I will be making my setup asap, will make a tread when everything is ready.

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                          • #88
                            I understand all these geometry problems that are solved with the setups I see here. The thing is... Does it really worth spending around 3000 euro for front and rear dtm style trailing arms and control arms?

                            You guys who use these kind of stuff(and corrected your bumpsteer/roll center), did you see any changes to you lap records? Or its just for the feeling and the ability to change settings faster?
                            Motornuts, what did you do with your car today?

                            My projects:
                            http://beta.motornuts.com/scaraveos/MR2-Spyder
                            http://beta.motornuts.com/scaraveos/BMW-E30
                            http://beta.motornuts.com/scaraveos/EP82

                            Comment


                            • #89
                              adjustable rear arm fixtures

                              I have all the pictures of the fabrication/tooling fixtures of building GUSTAVS arms/beam but need a little tutorial on how to post pictures

                              J. MASON

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                              • #90
                                It's easy. Go to photobucket.com or another free image hosting site, create an account, and then upload your pics to your account.
                                Then, on S14.net, add to this topic thread the URLs of the desired images using the "Insert Image" icon found above the message text area. You'll need to repeat this operation for each image you want to post.

                                You'll need to know each URL for the images you have hosted on Photobucket.
                                Typically, you can just right-click a hosted image and choose Properties to display and then copy the URL for the image. Or the image hosting site might even display the URL for each image.
                                Last edited by ColinM; 10-16-2008, 12:37 PM.

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