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  1. #1
    Join Date
    Jan 2009
    Posts
    303

    Default Upper a arm angles

    What affects having one side taller then the other day left front more angle then right front or vise versa right more angle the. Left front.. And also what bout moving them on the frame mount

  2. #2
    Join Date
    Feb 2008
    Location
    Plainfield, IL
    Posts
    425

    Default

    Your front RC will be closer ( Left to Right) to the side with more angle in it. Frame mounts of upper and lower along with lower angle are going to effect height of RC and also antidive on upper frame mount front to back. It all has to be mapped out to know where it will end up, you just cant through angle in it.

    Dave
    2012 UMP Stock Car National Champions.
    2013 UMP Modified Rookie of the Year
    2014 Kankakee Speedway UMP Modified Champion
    2016 Fairbury American Legion Speedway UMP Modified Champion
    2016 Kankakee Speedway UMP Modified Champion
    2016 UMP Modified, Northen IL Regional Champion
    2018 UMP Modified, #2 National Points Standings
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  3. #3
    Join Date
    Aug 2016
    Posts
    212

    Default

    Changing your upper a arm angles changes your camber curves, it changes moment center location, it also changes jacking forces on the tire, depending on if you move the front or rear mounting points up or down it can add or remove anti dive, induce pro dive, which changes your bump steer due to caster gain (yes changing caster affects your bump steer). LF with more angle than RF moves MC further left, right side having more would move it right. The MC is the resultant of the instant centers' intersection in the front end of the car. Moving the front higher than the rear produces anti dive, caster gain and will change your bump steer, while moving the front lower than the rear produces pro dive, caster loss and bump steer changes. Flatter a arms on the right side tend to have not the most ideal camber curves when there is chassis roll, so more angle in the right side is more ideal, but to counter act this adjustment you need to increase the angle in the left side even more. How much depends on the lengths of the arms and the overall lay out. Hope that helps.

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