Tethering LF

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  • Rock Farmer
    Junior Member
    • Jan 2020
    • 4

    #1

    Tethering LF

    Can someone explain the theories on tethering the LF suspension? What is the effects of more LF droop or less LF droop?
  • MasterSbilt_Racer
    Senior Member
    • May 2007
    • 14303

    #2
    Originally posted by Rock Farmer View Post
    Can someone explain the theories on tethering the LF suspension? What is the effects of more LF droop or less LF droop?
    It promotes exit understeer. It's very common in road racing to tether both fronts.
    Modern Day Spec Wedge Racing

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    • Jim11h
      Senior Member
      • May 2007
      • 1501

      #3
      So tightens exit? Had Driver tell me it allowed him to get in better and due to natural chassis force of car trying to lift lf, that the chassis fight forces lr bite/ traction. Hopefully explained his theory well
      Last edited by Jim11h; 09-02-2020, 01:10 AM.

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      • MasterSbilt_Racer
        Senior Member
        • May 2007
        • 14303

        #4
        Originally posted by Jim11h View Post
        So tightens exit? Had Driver tell me it allowed him to get in better and due to natural chassis force of car trying to lift lf, that the chassis fight forces lr bite/ traction. Hopefully explained his theory well
        Once the tire is lifted, the unsprung weight is now left side sprung weight. Depending on on when this happens, it will affect entry or corner center as well.
        Modern Day Spec Wedge Racing

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        • Jking24
          Senior Member
          • Oct 2017
          • 1512

          #5
          Many drivers that had a very unbalanced car to begin with see huge gains everywhere from adding a tether. Mainly due to it helping the overall stability of the car at attitude

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          • MasterSbilt_Racer
            Senior Member
            • May 2007
            • 14303

            #6
            Originally posted by Jking24 View Post
            Many drivers that had a very unbalanced car to begin with see huge gains everywhere from adding a tether. Mainly due to it helping the overall stability of the car at attitude
            If your front end is suspect, getting a tire off the ground cures some ills.
            Modern Day Spec Wedge Racing

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            • dirty4life
              Junior Member
              • Sep 2020
              • 3

              #7
              Why hasn't anyone built a sway bar that reverses the LF movement, and would shove down on LF as RF goes up?

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              • MasterSbilt_Racer
                Senior Member
                • May 2007
                • 14303

                #8
                Originally posted by dirty4life View Post
                Why hasn't anyone built a sway bar that reverses the LF movement, and would shove down on LF as RF goes up?
                The chain acts as a sway bar. Your roll center becomes the rf contact patch, when the lf leaves the surface.
                What you describe would be pro roll.
                Modern Day Spec Wedge Racing

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                • Austin34471
                  Senior Member
                  • May 2010
                  • 174

                  #9
                  Originally posted by MasterSbilt_Racer View Post
                  The chain acts as a sway bar. Your roll center becomes the rf contact patch, when the lf leaves the surface.
                  What you describe would be pro roll.
                  Well when the LF is on the chain but the tire is on the ground and the RF isn’t on a the bumpstop, the roll center is the LF contact patch.. then once it hits the RF bumpstop, the roll center moves back to the RF contact patch.. then when the tire leaves the roll center is DEFINITELY on the RF contact patch. I just don’t know how we can even make laps without crashing with all of this dynamic roll center movement! :-o

                  Comment

                  • racer2e
                    Member
                    • Jan 2012
                    • 54

                    #10
                    They have made a bar that promotes roll. It is "Z" shaped and was used on formula VEE cars. I have often thought of using on diagonally on the RF/LR.

                    Comment

                    • 95shaw
                      Senior Member
                      • Nov 2007
                      • 205

                      #11
                      Originally posted by MasterSbilt_Racer View Post
                      The chain acts as a sway bar. Your roll center becomes the rf contact patch, when the lf leaves the surface.
                      What you describe would be pro roll.
                      So, the next evolution would be heavy components on this corner of car?

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                      • MasterSbilt_Racer
                        Senior Member
                        • May 2007
                        • 14303

                        #12
                        Originally posted by 95shaw View Post
                        So, the next evolution would be heavy components on this corner of car?
                        I saw weights on the lower control arm of fast cars at least 5 years ago.
                        Modern Day Spec Wedge Racing

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                        • Krooser
                          Senior Member
                          • Nov 2012
                          • 3117

                          #13
                          So how does one determine how long the chain is and the correct mounting?
                          Member of the Luxemburg Speedway Hall of Fame
                          Class of 2019

                          Comment

                          • billetbirdcage
                            Senior Member
                            • May 2007
                            • 2019

                            #14
                            Originally posted by Krooser View Post
                            So how does one determine how long the chain is and the correct mounting?
                            Honestly trial and error, if you have a car old enough they didn't have a setting for it. I would start around 1.5" extended from ride height measuring pin to pin on the shock, then adjust from there. You can rough adjust in 3/8 to 1/2" adjustments and then fine tune it from there once you find what you or the car likes.

                            Your better to start off longer then shorter, least from a less messing with ya stand point.

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