Hooked pulling front wheels then spun

Mopar Racers Forum

  1. Walker434

    Walker434 Well-Known Member

    Messages:
    935
    Likes Received:
    599
    Joined:
    Aug 29, 2012
    Location:
    Nashville, TN
    Local Time:
    7:06 AM
    Took the Dart to Bowling Green on Saturday and ran 10.65 @ 128. The car launched hard, pulled the front wheels almost a foot off the ground then lost traction.

    I have SS springs, CR 9 way adjustable shocks in the back. Cheap 90/10s up front. The Back shocks are set on 7. Should I adjust them to be firmer at the track? Like 8 or 9?

    I saw several other cars having this problem too. I hope it was the track because I'm getting ready to leave for drag week and need to run low 10s. Spinning is no bueno.

    Dart 34.jpg

    Dart 37.jpg
     
  2. Toluene56

    Toluene56 Well-Known Member

    Messages:
    876
    Likes Received:
    651
    Joined:
    Nov 9, 2009
    Location:
    reno
    Local Time:
    5:06 AM
    Being as they're not double adjustable, I would try #8 and runs couple times to see if it helps.. do you have a video? That may help people's ideas as well.
     
  3. Horseshoe49

    Horseshoe49 Well-Known Member

    Messages:
    128
    Likes Received:
    65
    Joined:
    Oct 10, 2014
    Location:
    Murfreesboro Tn
    Local Time:
    7:06 AM
    You may be running out of shock travel and topping the shock out as well.
     
    • Agree Agree x 4
    • jimjimjimmy

      jimjimjimmy lobsterman FABO Gold Member

      Messages:
      4,404
      Likes Received:
      1190
      Joined:
      Nov 2, 2010
      Location:
      p. e. i.
      Local Time:
      9:06 AM
      my car was doing this and I found a softer setting worked best like 2 on the dr side and 3 on the ps . I was told that to high of a setting will unload the tire , it seems to work better .
       
      • Like Like x 1
      • flyfish

        flyfish C8H18+N2O = :-D

        Messages:
        1,984
        Likes Received:
        555
        Joined:
        Apr 16, 2007
        Location:
        Indy
        Local Time:
        8:06 AM
        This sounds probable, and would be my best guess.

        Your MPH in the 1/8 and 1/4 look almost identical to my car...you should be in the 6.5's 1/8 and 10.3's in the 1/4. Good luck at drag week!
         
      • brian6pac

        brian6pac Well-Known Member

        Messages:
        4,642
        Likes Received:
        3123
        Joined:
        Nov 15, 2016
        Location:
        N.E.Ohio
        Local Time:
        8:06 AM
        Do you have the rear of the leafs strapped or not strapped ? And as said, if the shocks bottom out fully extended it will unload the tires.
        B&E body shocks are longer if I remember correctly.
         
      • Walker434

        Walker434 Well-Known Member

        Messages:
        935
        Likes Received:
        599
        Joined:
        Aug 29, 2012
        Location:
        Nashville, TN
        Local Time:
        7:06 AM
        The shocks are long enough I have checked, not bottoming out. I have an extra clamp on the front segment of the spring and I've removed the back segment. I'll try a softer setting on my shocks. Hopefully it works, I can't afford to spin at drag week.
         
      • brian6pac

        brian6pac Well-Known Member

        Messages:
        4,642
        Likes Received:
        3123
        Joined:
        Nov 15, 2016
        Location:
        N.E.Ohio
        Local Time:
        8:06 AM
        You want the shock to extend faster and compress harder, sounds like the set up should work fine, I had Monroe racing shocks on the rear of my car back in the day and they were extra long 75/25. I could carry the front wheels almost all the way through 1st gear.
         
      • Oldiron440

        Oldiron440 Well-Known Member

        Messages:
        460
        Likes Received:
        501
        Joined:
        Jan 12, 2019
        Location:
        North central Iowa
        Local Time:
        7:06 AM
        I've run 1.39 to 1.43 sixty foot times with half ton truck shocks, just cheap hydraulic shocks. There two inches longer than the car shocks. But don't tell anyone the haters will come out. :)
         
        • Agree Agree x 2
        • Like Like x 1
        • Horseshoe49

          Horseshoe49 Well-Known Member

          Messages:
          128
          Likes Received:
          65
          Joined:
          Oct 10, 2014
          Location:
          Murfreesboro Tn
          Local Time:
          7:06 AM
          Bottoming out and topping out are 2 different animals, not trying to split hairs just making sure we are talking the same lingo. Make sure your shock has enough outward extension is what I was referring to.
           
          • Like Like x 1
          • weedburner

            weedburner Well-Known Member

            Messages:
            176
            Likes Received:
            167
            Joined:
            Oct 20, 2015
            Location:
            Wa State
            Local Time:
            5:06 AM
            Both shock travel and spring rate need to compliment suspension travel. In the front suspension, that means the front springs/bars should reach their unloaded point at the same time as the front suspension tops out. If the front springs/bars are still pre-loaded when they reach their limit of travel, you will see an abrupt transition in tire load at the rear as the front tires lift off the ground, which in-turn can cause the rear to break traction. Basically that means a spring/bar can be too soft for the available travel when the car is capable of pulling the front tires.

            Grant
             
          • Walker434

            Walker434 Well-Known Member

            Messages:
            935
            Likes Received:
            599
            Joined:
            Aug 29, 2012
            Location:
            Nashville, TN
            Local Time:
            7:06 AM
            The first time I had this car to a track with this combo a couple weeks ago..(Different Track 1/8 Mile) it hooked and carried the front wheels through first gear and did a 1.47 60ft time. I'm really hoping this track was just poorly prepped and I don't have to change too much. I'm going to try setting the rear shocks on 5 and see if this helps. Might call Calvert tomorrow and pick their brain also. Thanks for the help FABO.
             
          • brian6pac

            brian6pac Well-Known Member

            Messages:
            4,642
            Likes Received:
            3123
            Joined:
            Nov 15, 2016
            Location:
            N.E.Ohio
            Local Time:
            8:06 AM
            This might be a dumb question but did you bleed the shocks before you put them on ?
            I also found this chart I thought I had one but couldn't find it,
            The Calvert's are 1 is firmest and 9 is softest, seems backwards to me.
             

            Attached Files:

          • Toluene56

            Toluene56 Well-Known Member

            Messages:
            876
            Likes Received:
            651
            Joined:
            Nov 9, 2009
            Location:
            reno
            Local Time:
            5:06 AM
            9 is firm 1 is soft. the reference point would be straight up for selection.
             
          • yellow rose

            yellow rose Doctor of Thinkology.

            Messages:
            22,054
            Likes Received:
            18119
            Joined:
            Jun 19, 2015
            Location:
            Living on the razors edge
            Local Time:
            5:06 AM
            Which direction does the shock get "softer" or "firmer"? Or does going to a different number make the bump stiffer and rebound softer? Or the other way around?

            I'm dealing with a customer with a set of these. And no one can answer that question.
             
          • Oldiron440

            Oldiron440 Well-Known Member

            Messages:
            460
            Likes Received:
            501
            Joined:
            Jan 12, 2019
            Location:
            North central Iowa
            Local Time:
            7:06 AM
            In my experience the front shocks and how soft they are had much to do with the rear unloading. As in to soft.
             
            • Agree Agree x 1
            • brian6pac

              brian6pac Well-Known Member

              Messages:
              4,642
              Likes Received:
              3123
              Joined:
              Nov 15, 2016
              Location:
              N.E.Ohio
              Local Time:
              8:06 AM
              I agree, That's why I was looking for the instruction. I was going to buy a set at one time but never did. I just went to the website and got the instructions, It is confusing #1 is firmer, #9 is softer ? in both directions or in one direction.
               
            • yellow rose

              yellow rose Doctor of Thinkology.

              Messages:
              22,054
              Likes Received:
              18119
              Joined:
              Jun 19, 2015
              Location:
              Living on the razors edge
              Local Time:
              5:06 AM

              That's what I can't figure out. Calvert tries to explain it to me but it doesn't make sense.

              I've told them I want be stiffer in bump and not change the extension. I'm on number 5. Which way do I go?? They never give me the correct answer.

              So I've told my customer to sell them and spend the money on some DA Viking shocks so they can be tuned.
               
            • fishmens67

              fishmens67 Well-Known Member

              Messages:
              7,657
              Likes Received:
              5090
              Joined:
              Nov 10, 2012
              Location:
              idaho
              Local Time:
              7:06 AM
              To adjust Calvert 9 ways, you need to turn the dial counter clockwise and center between 1 and 9.
              then turn clockwise to the preferred number setting.
              All the adjustable shocks are set pretty much the same way.
               
            • crackedback

              crackedback FABO Gold Member FABO Gold Member

              Messages:
              18,551
              Likes Received:
              2858
              Joined:
              Aug 7, 2005
              Location:
              92201
              Local Time:
              5:06 AM
              I'd try slowing the front end down a little if it's hitting and unloading.

              More air in the tire if the tire is deforming on the hit too.
               
            • brian6pac

              brian6pac Well-Known Member

              Messages:
              4,642
              Likes Received:
              3123
              Joined:
              Nov 15, 2016
              Location:
              N.E.Ohio
              Local Time:
              8:06 AM
              Still doesn't say compression or rebound
               
              • Agree Agree x 1
              • brian6pac

                brian6pac Well-Known Member

                Messages:
                4,642
                Likes Received:
                3123
                Joined:
                Nov 15, 2016
                Location:
                N.E.Ohio
                Local Time:
                8:06 AM
                I was thinking tire pressure also to low, How much pressure are you running ?
                 
              • mbaird

                mbaird mbaird

                Messages:
                5,994
                Likes Received:
                2904
                Joined:
                Dec 10, 2005
                Location:
                boise, Id
                Local Time:
                6:06 AM
                The correct terminology is rebound and dampening. I would think a high end shock would have settings for both.

                Setting up suspension for dirtbikes is quite an art. Not one I can say I have mastered unfortunately. The correlation between the settings and effect are often counterintuitive.
                For example....if you feel your forks are harsh instinct tells you to soften the compression. But you actually need to increase or stiffen the compression. What is happening is your forks are being compressed more and more with each bump and getting further and further into the spring compression...
                It also might be due to incorrect rear shock settings or undersized springs !
                 
              • brian6pac

                brian6pac Well-Known Member

                Messages:
                4,642
                Likes Received:
                3123
                Joined:
                Nov 15, 2016
                Location:
                N.E.Ohio
                Local Time:
                8:06 AM
                Yea, You don't get it. If the forks are compressing more and more you have to soften up the rebound, if your washing out in the corners you need to soften up the rebound because the tire is not hitting the ground fast enough to get traction. The compression is just that you don't want it bouncing the bike up in the air just the tire. If it throws the bike up than the fastest rebound wont get the tire back on the ground.

                And it's compression and rebound, dampening is related to both.
                 
              • mbaird

                mbaird mbaird

                Messages:
                5,994
                Likes Received:
                2904
                Joined:
                Dec 10, 2005
                Location:
                boise, Id
                Local Time:
                6:06 AM
                I stand corrected on the use of the term dampening ....
                But increasing the compression rate will help in fast bumps. Not saying you are wrong in certain instances .... thus the ART.
                Bikes have far more variables than a drag car.
                The point is that the correction for a symptom may be the opposite of your initial thoughts.
                 
                • Like Like x 1
                1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
                  By continuing to use this site, you are consenting to our use of cookies.