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Thread: Bump steer limitation: Fox rack, SN95 Spindles, Ackerman mod

  1. 02-14-2011, 07:26 PM #1
    Ophitoxaemia
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    Bump steer limitation: Fox rack, SN95 Spindles, Ackerman mod

    Even with the highest setting (closest to the bottom of the steering arm) I've still got toe out on compression and toe-in on droop. That means I need to move the rack down or the steering arm attachment up.

    Hard to move the rack down because I have it bolted to X-member and its on offset bushings, raised so the rack boss clears the X-member.

    For autocross, would I be better off returning the rack to the stock position.

    Mark I, SAI mod, custom lowers, monoball upper.

    Other options?
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  2. 02-14-2011, 09:37 PM #2
    David
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    James, do you have the rack extensions on your car? I would start there.

    David
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  3. 02-14-2011, 09:59 PM #3
    R. Button
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    David,

    Rack extensions?
    Ralph Button
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  4. 02-15-2011, 01:08 AM #4
    Bob Cowan
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    Measure tow in and toe out at the front of the tire. Then measure toe in and toe out at the rear of the tire. Subtract one number from the other to get bump steer.

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  5. 02-15-2011, 02:26 PM #5
    Ophitoxaemia
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    No rack extensions yet, haven't found a source (hey does FFR sell them?) - (@ralph, the Fox rack is too narrow so you won't be able to get the bump steer right with just spacing from the steering arm.
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  6. 02-15-2011, 03:27 PM #6
    Shade Tree Mechanic
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    Quote Originally Posted by Ophitoxaemia View Post
    No rack extensions yet, haven't found a source (hey does FFR sell them?) - (@ralph, the Fox rack is too narrow so you won't be able to get the bump steer right with just spacing from the steering arm.
    Yes they do sell them.
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