2012 masterbilt smack rf spring rate

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  • burgessracing
    Junior Member
    • Oct 2011
    • 20

    #1

    2012 masterbilt smack rf spring rate

    How low on the rf spring can i go to get more rf bite at turn in without going too low. car has no bite at turn in on or off the throttle. good in center and exit. springs lf 450, rf 325, lr 175 (14 inch) rr 225 left 54 %, rear 52.5 %, wedge 60 lbs, pinion 9" on frame, 1/2 " below pinion rearend 15 3/4, top bars at standard, lowers bars all the way up, rearend rolled back 3/4 inch.
  • Matt49
    Senior Member
    • Jun 2007
    • 3123

    #2
    Are you saying you are tight on entry both on or off the throttle? Car won't turn?
    What is the track configuration and condition?

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    • burgessracing
      Junior Member
      • Oct 2011
      • 20

      #3
      track is a tacky high grip 1/4 mile ---sweeping turns----if car is right you can flat foot all the way around. Yes the car would not turn in well at all---neither on throttle or off but worse off throttle----it felt like the right front tire has grease on it----no bite on the rt front tire-- thanks matt for helping---

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      • 25drtrkr
        Senior Member
        • May 2015
        • 856

        #4
        If you have checked for any binding in the suspension and have all the set-up measurements right, I would look at adj the j-bar. On a Smack car I crewed before, on a high grip track, we were down to 5" on the frame. If you're super tight, I would raise the jbar on the pinion 1" and lower the frame mount 1", and then just lower the frame mount 1" at a time.
        Lions don't worry about the opinions of sheep.

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