Caltrac’s and high rpm doesn’t mix

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  1. o1heavy

    o1heavy 1974 dart sport

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    We are getting somewhere now
    Added weight leaving at 4300rpm
     
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    • skrews

      skrews Well-Known Member

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      Looking better.
       
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      • '63GT

        '63GT Well-Known Member

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        Yellow Rose is spot on!
        Your car is leaving, 'neutral'.
        When you installed your CalTrac's, did you tighten the front spring eye bolt down 'tight', or did you leave 'slack' in it? There HAS to be slack in the mechanism or the CalTrac's won't work properly, they will bind up.
        The Nyloc nut supplied is not to prevent the nut from backing out, it's to allow freedom in the front eye, so that the bars will work.
         
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        • '63GT

          '63GT Well-Known Member

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          Of coarse there's a limit to everything... Steve Wann likes to run it loose too. Too loose in this run against John Winslow at Bakersfield.
           
        • o1heavy

          o1heavy 1974 dart sport

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          Removed the 85lbs reset bars to a nickel gap and we are back to the bouncing the tire


          Tighten the rebound doesn’t seem to help
          Only thing it does is stop the separation
          Man what a pain in the ass these things are
          I will drop the rear tire air pressure this weekend just to see
           
        • Toluene56

          Toluene56 Well-Known Member

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          I'm probably wrong.. but wouldn't you want to loosen the rebound and tighten compression. That way when it hits the tire it keeps the pressure on it and promotes separation? I'm trying to learn all this fancy shock tuning stuff. Lol.
           
        • '63GT

          '63GT Well-Known Member

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          The guy I mentioned in Post 79 runs 1/2 to full turn of preload on the car in the video.
          Starting point is zero. Just tight enough, where you can still move the roller on the spring.
           
        • mopar65

          mopar65 Well-Known Member

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          Hey Joe sorry to hear all about all the trouble you are having. I can't add much but maybe ask Jason Teague how he has his duster set up. He has a 71 plymouth duster with a gen 3 N/A Hemi with caltracs. I know he is useing a transbrake. But I don't remember what shocks etc he is useing.

          Screenshot_20200929-093728_Photos.jpg
           
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          • o1heavy

            o1heavy 1974 dart sport

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            N
            I’ll ask him. But I believe he is leaving at a lower rpm.
             
            Last edited: Sep 29, 2020
          • o1heavy

            o1heavy 1974 dart sport

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            527D645A-3432-4F28-BD76-7E13B9C39BAC.jpeg https://youtu.be/6Tq1_Uql5Gs
            Ok just Incase anyone else can use this info
            This is the spring relocation boxes from US cartool has 3 different front spring mounting locations
            I went from the top hole to the very bottom
            Which raises the rear of the car but should lower the instant center
            Went to a pro bracket radial
            And have roughly 10 passes on the since the
            Changes and 10 passes have been perfect
            According to the 60 and the video ,
            I have been leaving at 4500 all weekend then and after I was put out of the race this weekend I put the two-step to 5000 which is the video I posted .
            Which help of Jeff w8/904 combo guy
            I believe I’m actually making some progress
             
            Last edited: Oct 5, 2020
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            • o1heavy

              o1heavy 1974 dart sport

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            • ValiantRacing

              ValiantRacing Well-Known Member

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              Was that in 2012? i was there that year, and they had to change the oil pan.
               
            • '63GT

              '63GT Well-Known Member

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              2011 Divisional in Bakersfield.
              See if you can spot yourself below..
               
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              • ValiantRacing

                ValiantRacing Well-Known Member

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                I did see myself , i thought is was 2012
                 
              • '63GT

                '63GT Well-Known Member

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                lol no kidding ?? where? (time)
                 
              • ValiantRacing

                ValiantRacing Well-Known Member

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                4.30 next to Orange Demon
                 
              • '63GT

                '63GT Well-Known Member

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                OH !? you were talking to John Gray.
                Larry Gilley at 5:10 talking to Don Wann (RIP)
                 
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                • 70aarcuda

                  70aarcuda Master Hoader of SBM FABO Gold Member

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                  AT 3.03 Dad's Barracuda Earl Blake....my neighbor...
                   
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                  • Jadaharabi

                    Jadaharabi FABO Gold Member FABO Gold Member

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                    @63GT
                    Did you record that vidio?
                     
                    Last edited: Oct 24, 2020 at 10:27 PM
                  • '63GT

                    '63GT Well-Known Member

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                    No, Toby Lang did that.. Nice that he took the time to give us an inside scoop !
                    Especially since I didn't make that event... (but heard ALL ABOUT IT lol)
                     
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                    • RockinRobin

                      RockinRobin Well-Known Member

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                      I am also an N/A gen3 hemi but I footbrake and leave at 1500rpm.
                      For what it's worth the front is right down on the bumpstops and tire pressure is 12.2 on 12x29.0 Hoosiers. 60' is 1.45. Calvert 90/10's on the front and Calvert single adjustable on the back about 1 click from full loose.
                      slant 6 torsion bars up front and stock 318 leafs in back.
                      I see you are in Houston. Do you ever take it to Little River?
                      Duster.jpg
                       
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                      • o1heavy

                        o1heavy 1974 dart sport

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                        Thanks for sharing .
                        If you were asking me about little river .
                        I haven’t been to little river yet
                        I usually stay local, Evadale, pine valley and Hmp
                         
                      • RockinRobin

                        RockinRobin Well-Known Member

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                        I love Pine Valley but haven't raced there in about 3 years.
                        I thought Evadale was closed.
                         
                      • o1heavy

                        o1heavy 1974 dart sport

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                        Same guy That is Running pine valley is running Evadale, pretty good index program
                        check out the Facebook page and come join in on a index race. 7.0 or a 5.80
                        To choose from , the payout is usually good depending on the car count .
                         
                      • RockinRobin

                        RockinRobin Well-Known Member

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                        good to hear that Evadale is still open. I tried a 6.60 index once but just couldn't get the pro tree since I was footbraking and setup for sportsman tree. Had terrible lights like .1 or .12 and was in the trailer in a hurry.
                         
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