USRA BMOD set up

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  • dirtracer07x
    Senior Member
    • Aug 2014
    • 101

    #1

    USRA BMOD set up

    Ok so we are trying something a little different for us and im wondering if anyone else is having luck with this style setup. 550 on both front springs 175 on both rear. pullbar high and flat... only 10* seemed to work on the big dry slick 3/8's. just wondering how it will do on the small bullrings? thinking about trying 150 on rr. THOUGHTS?
  • hpontap
    Senior Member
    • May 2008
    • 574

    #2
    On the smaller tracks, you usually want more initial drive off so you run more angle in the pullbar.
    More angle = more initial drive but fades quicker
    Less angle = Less initial drive but holds it longer
    It all depends on the way its all set up too tho. I ran 18-20 degrees of angle on a 1/4-3/8 mile track with a 4 bar car.
    The softer RR spring should help also.

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