(VIDEO) 70 Dart Swinger Drag Racing Suspension tips

Suspension, Steering and Chassis

  1. y26

    y26 Member

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    Sorry if this is the wrong section!
    [YT][/YT]
    Hey guys, looking for some help with the suspension on my 1970 dodge dart swinger. Car has a 340 with around 450-500 hp, powerglide transmission with transbrake (leaving around 4000). In the front I have new qa1 control arms with 90/10 shocks and mopar performance torsion bars, The car has good free travel of 5+ plus in the front. Going to the back I have the subframes connected, calvert mono leaf, caltracs, qa1 single adjustable shocks. The car has also been minitubbed with leafs relocated allowing me to run 28x11.5x15 MT ET Drag slicks. I ran last weekend at a local 8th mile strip, best run was 7.23 at 93.3mph with a 1.58 60', but cant get the car to leave the line without spinning. Tried caltracs in both top and bottom hole, preload and no preload on both, shocks set all the way loose in the back, tried tire pressure from 9.5 all the way to 13.5(ordered tubes to help stiffen sidewall of slicks now). Any suggestions are greatly appreciated! Thanks, Cole.
     
  2. twayne24365

    twayne24365 Well-Known Member

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    I'm sure someone else will chime in but almost looks like the shock needs tightened up a little, the tire is hitting hard then unloading, a little bit stiffer might control the shock better and slow down the hit of the tire
     
  3. replicaracer43

    replicaracer43 Grumpy Old Man

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    I agree on the shocks, AND make sure they are long enough not to extend all the way to the end of travel.
     
  4. twayne24365

    twayne24365 Well-Known Member

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    Does look like it's topping out doesn't it...
     
  5. y26

    y26 Member

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    Thanks for the input so far, I wondered about them bottoming out also. Quite possible I went too much, I added an extension on the shock mount before the year thinking they were too compressed already with only 1.5-2" extended on top of shock while car was on ground, now they show around 4-5" on top of shock.
     
  6. needsaresto

    needsaresto Well-Known Member

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    I did see the rear bounce,thanks to the super slow motion. Good video! Seems to me the rear suspension is taking a hop.
     
  7. crackedback

    crackedback FABO Gold Member FABO Gold Member

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    If I read that correctly, you took shock length/travel OUT which is almost never a good thing.
     
    • Agree Agree x 1
    • y26

      y26 Member

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      I did, I was worried it being almost all the way compressed wasn't good, thinking I needed travel both ways. I will be moving back to original mount before the next race! Also someone mentioned getting a double adjustable shock, any suggestions for this car?
       
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