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full hydro steering setup.

Discussion in 'Ford Raptor Problems and Questions Forum' started by Jayke_Panam, May 12, 2019.

  1. Jayke_Panam

    Jayke_Panam Member

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    May 12, 2019

    Gen 1 raptor 6.2L highly modified

    I have a raptor at our shop that has a baja kits long race kit. the truck has a full hydro setup running in it. Now i havent done steering work before, but from my limited experience i know it isnt ideal or even really safe to run full hydro on a race setup... That aside id like to fix the minor issues first.

    The truck has some horrible bump steer. I thought it may be related to the hydro setup and ram size.
    I measured the eye to eye and got these results.

    Hydro Rack - 680mm
    Standard Rack - 930mm
    tie rods - 500mm

    So there is a good 250mm of difference in the rack length. which would make the tie rods 125mm longer than standard and the geometry would be different.

    Does anyone know if this would be causing the bump steer.

    Thanks Jake
  2. caleb

    caleb Member

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    Dec 27, 2017
    Is this a full hydro setup or a hydro assist (i.e. is there physical linkage from steering wheel to axle or does the wheel go to a pump, sometimes with a shaft sometimes not, and then from the pump to the axle are only hoses that go to the cylinder that's mounted on the steering box on the frame)? Full hydro is a standard for racing. One of the biggest benefits is the feedback won't rip the steering wheel out of your hands if you hit a rut/rock/whatever. If it's hydro assist it's much more susceptible to bump steer. The bump steer is usually caused by incorrect geometry (toe, caster, camber, etc). Having full hydro will prevent bump steer from suspension cycle, hydro assist will not stop that.

    Sorry, I know this thread is a little old, hopefully you got it figured out.
  3. PlainJane

    PlainJane AKA Knot Now

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    Apr 3, 2019
    San Diego, California
    Bump steer is caused by the wheels not tracking together i.e. one turning more than the other when the suspension is compressed, either together or individually.

    It cause by the lenght and angle of the tie in relation to the control arms. You are correct that make the tie rod longer could induce bump steer. IIRC, longer is less of a problem than shorter as the arc is flatter. The angle is more important.

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