1. blewbyoutobad

    blewbyoutobad Well-Known Member

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    I have a new problem of wheel hop. I searched the forum but didn't really find what I wanted. Just finished the car with new wheels and tires. The car: 69 Dart Swinger 340, 4 speed. Everything is new with Mancini extra heavy duty leafs and stock shocks with extra length for the leafs. Wheel hop is bad. Gears are 3:23, làunch at 3500, cam power band is 3500 to 7000. I know I need more gear but I'm in the country and every where is 15 to 25 miles. The wheels are 17x8 with a summer tire 245x45x17. It is factory diameter at
    25.7". This car never wheel hopped until I made this change. Before I was running 255x60x15 at 27.2" tall drag radials. I searched and searched for a softer shock with some added length for the heavy duty leafs. I have a set of new Competition Engineering shocks I could run. I run the car on the street and when launching at 3500 is smokes the tires and does the wheel hop. Any launch lower and it's bog because of the cam and gear ratio. Any help appreciated. Thanks FABO
     
  2. MOPAROFFICIAL

    MOPAROFFICIAL FABO Gold Member FABO Gold Member

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    ......You have no sidewall Flex with the new dimensions....so the tire can't move like it did before...and therfore it just bites,breaks...bites n breaks over n over.

    That's the only change you made, as you said , and now this problem occurs.

    How many drag cars do you see that have 1.5" tall side walls....answer is N O N E
     
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    • blewbyoutobad

      blewbyoutobad Well-Known Member

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      The side walls are around 3" but I get it. Funny thing is it didn't do it at first.
       
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      • Joey4speed

        Joey4speed FABO Gold Member FABO Gold Member

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        Rear wheel hop?
        What type of pinion snubber?
        I also developed a bad rear hop (more like a bang, bang, bang) when I attempt a burnout.
        Hop started after I changed to 15 inch wheels.
        Never happened with 14s and same 3:55s and shocks.
        Used to do control burnout nicely, but now it's a horrible and embarrassing.
         
      • MOPAROFFICIAL

        MOPAROFFICIAL FABO Gold Member FABO Gold Member

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        Would you say these bite better?
        If so you need adjust your springs and possibly...more than likely...your pinion angle. If its wrong... the springs get to their rebound force quicker in the launch and will fight the tire...and they will go back n forth-hop.
         
      • MOPAROFFICIAL

        MOPAROFFICIAL FABO Gold Member FABO Gold Member

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        It's trying to hook and is probably doing a better job than the other tires...but it's not quite right.lol
        Spinning ain't winning...hoping ain't poppin..
        If you could never do a burnout again but were able to go wide open throttle from a dead stop n straight hook and lunch with no tire hop or spin.... would you care about burning out anymore? 'Outside of the wet burnout box of course'.
         
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        • blewbyoutobad

          blewbyoutobad Well-Known Member

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          Pinion angle has been adjusted to remove some vibration I had. Smooth now and angles match. These do not bite better.
           
        • MOPAROFFICIAL

          MOPAROFFICIAL FABO Gold Member FABO Gold Member

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          There's a required amount of nose down on the pinion in order to absorb the shock load of hard race launching. There is stock spec around 2*down and then race of 4-8+* down. If the pinion is almost straight to the Driveline stationary with no load then when you hit the gas and load it it's going to put it nose up and wind the Springs up and the Springs fully wound up will then resist and unwind breaking the tires loose and then repeating over and over
           
          Last edited: Nov 24, 2021 at 9:56 PM
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          • blewbyoutobad

            blewbyoutobad Well-Known Member

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            No pinion snubber
             
          • blewbyoutobad

            blewbyoutobad Well-Known Member

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            With the drag radials they would ßpin some but they also hooked better and went in a straight line. This gets a little squirrelly but doesn't hook. With that cam and gear there is windup time you until it sees the power bànd. Sounds like a gear is what it needs to get it moving.

            IMG_20211028_101923203_HDR.jpg
             
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            • 66340SEDAN

              66340SEDAN FABO Member #3649 FABO Gold Member

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              Back in the day Direct Connection and Mopar Performance offered leaf spring clamps that you would put at the front of your leaf springs, I have some but packed away so I can’t show a picture...but they could be easily made....supposed to help eliminate axle windup and wheel hop....Dick Landy also talked about this during his drag clinics and in books...I found these 2’pictures doing a search on FABO

              215AC299-1CEB-4666-A3E4-FD19C5EE2CE3.jpeg

              CC52482E-94FF-4887-9F23-FEE5C1857F7D.jpeg
               
              Last edited: Nov 24, 2021 at 8:37 PM
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              • Ironracer

                Ironracer Gearhead

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                I had that problem when I rebuilt the 383 magnum, 4 spd 68 Coronet I had (!&@%$#, darn fool!) I used clamps in front of the leaf springs, then added an adjustable snubber. Beat the snot of my rear pan..
                 
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                • blewbyoutobad

                  blewbyoutobad Well-Known Member

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                  I can install the drag radials on these wheels and get a set of 3:91s or 4:10s . I'm no stranger to low gears and highway driving. My 65 Valiant had 4:30s.
                   
                • blewbyoutobad

                  blewbyoutobad Well-Known Member

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                  Not into showing off with burnouts.
                   
                • blewbyoutobad

                  blewbyoutobad Well-Known Member

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                  My bad my drag radials are 15" and wheels are 17". Would the competition engineering shocks help keep it planted.
                   
                • MOPAROFFICIAL

                  MOPAROFFICIAL FABO Gold Member FABO Gold Member

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                  There's a soft medium and heavy setting on those shocks to control the extension rate..the main thing with them and why they're necessary is because they're longer and dont bind when using ss springs with their higher arch. You did say you already have extensions on the stock shocks, right?
                  Whatever you do I would make sure your pinion angle is right for the power level and what you're trying to do/launching and then move to everything else after that...like snubber....shocks...air pressure...
                   
                • blewbyoutobad

                  blewbyoutobad Well-Known Member

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                • Locomotion

                  Locomotion Well-Known Member

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                  Put stiffer shocks on it. Single adjustable Rancho shocks are good. I forgot the part # on my Dart Sport and car isn't here to check. You'll need to check your estimated compressed and extended lengths and look at Rancho's spec sheets for shocks with mounting ends that will fit.

                  The harder the tires are hit, the stiffer the shocks need to be to control the spring when it tries to wind up & unwind. I tried the Mopar 4-speed drag shocks on my Dart Sport with a 904 footbraking, but had a pretty high stall converter. Race only with 9" slicks, 2.74 low gear, 4.86 rear and 30" tall tires. It also had 002/003 SS springs! When traction wasn't good, it still wheel-hopped! With stiffer shocks, it sometimes spun due to track conditions, but it never wheel-hopped again. Always used a pinion snubber! Never saw a disadvantage to it.
                   
                • blewbyoutobad

                  blewbyoutobad Well-Known Member

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                  What I found was a shock that matches the CE drag shocks in length but they are not adjustable. Should I try the CE shocks again. They were a little to harsh on the street.
                   
                • MOPAROFFICIAL

                  MOPAROFFICIAL FABO Gold Member FABO Gold Member

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                  Hop mostly isnt a shock issue unless they are binding, too short....and that's all that's left. ..as in all else is set up right. Stiffer will extend harder and help plant them...if that's the even the issue. We have no idea where your pinion angle is set..
                   
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                  • 318willrun

                    318willrun Utube channel 318willrun

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                    10 dollar swap meet traction bars... paint them the color of your flavor, set bumper of the traction bar 1/2" from the eye of the leaf spring bolt, wheel hop gone ... or more controlled :)
                     
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                    • 33IMP

                      33IMP Well-Known Member

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                      Quickest and easiest experiment is tire pressure. My fox body five speed wheel hopped bad with 30 pounds, hooked good with 22.
                      And then I would sure try the adjustable shocks.
                       
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                      • MOPAROFFICIAL

                        MOPAROFFICIAL FABO Gold Member FABO Gold Member

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                        Got to remember street tires are not going to hold it at a certain point. It could be JUST the tires but as I said we have no idea where everything else is
                         
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                        • blewbyoutobad

                          blewbyoutobad Well-Known Member

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                          slapper bars should not be used on Mopars. They are not designed like Chevys. Behind the eye can bend the leaf spring.
                           
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                          • 318willrun

                            318willrun Utube channel 318willrun

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                            okay
                             
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