LR Bar Adjustment???

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  • DirtRacer9x
    Senior Member
    • Jul 2014
    • 305

    #16
    Originally posted by MasterSbilt_Racer View Post
    Shortening the upper has the opposite effect to wheel rate and indexing. Yes. Distance from axle centerline to lower spring mount effects the car as well.
    So higher or lower on birdcage bracket? What are the results? Also my RRU is all the way down on birdcage. What will that change? Thank you Masterbilt for your input too!

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    • HuckleberryB4
      Senior Member
      • Dec 2007
      • 220

      #17
      Higher or lower changes the reaction speed of the birdcage. Higher slows it down and takes away angle, lower speeds it up and also adds angle.

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      • HuckleberryB4
        Senior Member
        • Dec 2007
        • 220

        #18
        May be helpful for you to read over this.

        More than 40 years ago, AFCO racing and performance parts first answered the simple need for better racing suspension. AFCO shocks and suspension components quickly earned a reputation for giving a racing team an advantage. Today, the AFCO advantage can be found in thousands of performance products.

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        • HuckleberryB4
          Senior Member
          • Dec 2007
          • 220

          #19
          More helpful info.

          More than 40 years ago, AFCO racing and performance parts first answered the simple need for better racing suspension. AFCO shocks and suspension components quickly earned a reputation for giving a racing team an advantage. Today, the AFCO advantage can be found in thousands of performance products.

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          • DirtRacer9x
            Senior Member
            • Jul 2014
            • 305

            #20
            Originally posted by HuckleberryB4 View Post
            Thanks for the links. I've actually got those saved on my phone and bookmarked. But I've noticed in chassis you must mat he birdcages to chassis. I don't know if all builders do this because a bar adjustment on chassis to me should be designed for one hole on the birdcage. Meaning If you drop it on he birdcage it will change weight on that corner of the car. All I know is the bottom holes on my bsb cages all the way down line up perfectly from ride height to every hike on chassis and if I move the bars to the too of the birdcage it won't line up anymore. So I've left the RU bar mounted to the bottom hole on birdcage. Any suggestions and is this hindering my cars performance? 200 in RR and can change the slider from I think 10* and go to 25* for angle or should I lower spring rate instead in the dry? Just kind of lost on a few thins and trying to better understand everything I can. Tha is again everyone!

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            • washeduptoo
              Senior Member
              • May 2007
              • 1353

              #21
              4.5inches from center line of axle tube is pretty common for top or bottom trailing arm, call your chassis mfg or bsb for better guidance. Are you talking about your rr spring angle or lr spring angle?

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              • DirtRacer9x
                Senior Member
                • Jul 2014
                • 305

                #22
                Originally posted by washeduptoo View Post
                4.5inches from center line of axle tube is pretty common for top or bottom trailing arm, call your chassis mfg or bsb for better guidance. Are you talking about your rr spring angle or lr spring angle?
                Don't know the chassis manufacturer so can't do that. This is in the bottom hole on bsb cages on the RR. The chassis has 4 holes to make the slider go from around 5-10* to 20-25* on both sides tilted inward or outward.

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                • washeduptoo
                  Senior Member
                  • May 2007
                  • 1353

                  #23
                  Around 10-15 degrees is usually close on the angle for both sides unless your wanting more angle on rr. The more angle it has the less spring rate you have, I think. If this is wrong someone please correct me.

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                  • MasterSbilt_Racer
                    Senior Member
                    • May 2007
                    • 14303

                    #24
                    Originally posted by DirtRacer9x View Post
                    Thanks for the links. I've actually got those saved on my phone and bookmarked. But I've noticed in chassis you must mat he birdcages to chassis. I don't know if all builders do this because a bar adjustment on chassis to me should be designed for one hole on the birdcage. Meaning If you drop it on he birdcage it will change weight on that corner of the car. All I know is the bottom holes on my bsb cages all the way down line up perfectly from ride height to every hike on chassis and if I move the bars to the too of the birdcage it won't line up anymore. So I've left the RU bar mounted to the bottom hole on birdcage. Any suggestions and is this hindering my cars performance? 200 in RR and can change the slider from I think 10* and go to 25* for angle or should I lower spring rate instead in the dry? Just kind of lost on a few thins and trying to better understand everything I can. Tha is again everyone!
                    When you move the right top bar down toward the axle tube, it increases the load carried by the bar, increases the angle of the bar, and increases the wheel rate of the rr if spring is mounted on the front of the cage.
                    Modern Day Spec Wedge Racing

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                    • DirtRacer9x
                      Senior Member
                      • Jul 2014
                      • 305

                      #25
                      Originally posted by MasterSbilt_Racer View Post
                      When you move the right top bar down toward the axle tube, it increases the load carried by the bar, increases the angle of the bar, and increases the wheel rate of the rr if spring is mounted on the front of the cage.
                      Well it's only in the bottom hole because it lines up with the chassis holes when adjusting I'm assuming. I've got 200s across the rear both on sliders. Will tilting the slider in on RR be a better adjustment for dry or will changing to a 175 be better?

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                      • DirtRacer9x
                        Senior Member
                        • Jul 2014
                        • 305

                        #26
                        Originally posted by stock car driver
                        you just need to adj the length to put it in the other holes on the bird cage, adj the top or bottom bar to get your index right.
                        Thats what it is looking like STOCK CAR DRIVER. Seems ill have to play around on the scales with it and find out how many turns. Would you all recommend moving the RU bar up further away from axle tube?

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                        • washeduptoo
                          Senior Member
                          • May 2007
                          • 1353

                          #27
                          4.5 inches from center line of axle tube is common, how much do you have?

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                          • DirtRacer9x
                            Senior Member
                            • Jul 2014
                            • 305

                            #28
                            Originally posted by washeduptoo View Post
                            4.5 inches from center line of axle tube is common, how much do you have?
                            I haven't measured but the bsb cages are on the car and they have 6 holes (3 in front and 3 behind or staggered) and I'm in the lowest hole directly over axle tube.

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