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D series solid front axle bump steer.

Discussion in 'Troubleshooting: Bugs, Questions and Support' started by smyljr, Aug 4, 2018.

  1. smyljr

    smyljr
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    Joined:
    Feb 22, 2014
    Messages:
    27
    apologies if i post this in the wrong forum.

    in my testing, the bump steer in the D series is much higher than the effect for the hopper, regardless of suspension tuning, both being solid front axle. mostly noticeable on paved rapid inclines, such as the hills on west coast, or in loops.

    i would think it's an issue with moving the pitman arm so that the drag link stays at the same angle as the panhard bar.
     
  2. Goosah

    Goosah
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    Global Moderator
    BeamNG Team

    Joined:
    Aug 30, 2013
    Messages:
    790
    The hopper has a better suspension design where the track bar and drag link follow the same arc, so it is pretty stable with ride height. The D series has leaf springs which move in a vertical fashion, while the drag link always moves in an arc. So the D series will always have bump steer (as would the any real leaf spring truck, you'd be suprised how little they seem care about this stuff IRL ;) ). Yes the pitman arm location could be changed to get the bump steer minimized but it would have to be different for every ride height possible, not possible to get perfect for every variant, not to mention different loads that can be in the truck, etc.

    Unfortunately the nature of non force feedback kbd/gamepad input makes it more noticeable, in real life one just lets the steering wheel correct a few degrees.
     
  3. smyljr

    smyljr
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    Joined:
    Feb 22, 2014
    Messages:
    27
    yeah, i drive a 1992 jeep wrangler. solid front axle, leaf sprung. part of lifting it (the cheap way) means installing a longer pitman arm to compensate.

    2 ideas i had, neither of which seems easy.

    1: somehow stretch the pitman arm part in tuning, making it longer or shorter.
    2: add a steering slip setting in the controller settings. the game simulates an iron hard grip on the steering wheel, where in actual driving you would allow the steering wheel to slip when the bump steer happens, then continue driving normally.

    thanks for the response.
     
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