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Thread: Bump steer

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  1. #1
    Join Date
    Jan 2001
    Location
    Ontario Canada
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    111

    Default Bump steer

    Are we allowed to do any thing to correct bump steer on an ITB Mustang?

  2. #2
    Join Date
    Jan 2010
    Location
    Houston-ish
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    932

    Default

    Your best action is to not lower the car so much that bumpsteer is an issue.
    Houston Region
    STU Nissan 240SX
    EProd RX7

  3. #3
    Join Date
    Jul 2004
    Location
    Raleigh NC
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    3,682

    Default

    Bingo. That and follow the old adage "Any suspension will work as long as you don't let it".

  4. #4
    Join Date
    Nov 2007
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    South of Chicago, near Indiana.
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    Default

    Just asking a question here: Couldn't you consider the steering system on a rack-n-pinion steering system part of the suspension? The tie rod is a link in the suspension and it's connected to the rack which is connected to the K member with bushings. And since suspension bushings are free in IT then couldn't you take it to the point where you can use offset bushing to try to correct bump steer? Dicuss.

    I owned and raced a Fox Mustang and know the issues of bump steer. I didn't race it in IT so I was able to correct it using the more common heim joints in lew of tie rod ends method rather then offset rack bushings.
    1988 ITA Scriocco 16V #80
    MCSCC member since 1988

  5. #5
    Join Date
    Jul 2004
    Location
    Raleigh NC
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    Default

    I suspect that is a bit of a tortured interpretation. The GCR defines suspension bushing as:

    Suspension Bushing – A hollow cylindrical mounting component which
    acts as a bearing, allowing constrained motion, between a suspension
    component and attachment point.

    The IT bushing language is:

    Bushing material, including that used to mount a suspension
    subframe to the chassis, is unrestricted. This includes
    the use of spherical bearings, so long as no suspension
    component is modified to facilitate their installation. Retention
    of spherical bearings by use of tack welds is allowed,
    as long as the welds serve no other purpose.

    And that language is under "Suspension Mounting Points". Steering is not specifically mentioned or called out, but, steering as defined in the GCR is a bit weak and doesn't specifically cite the rack.

  6. #6
    Join Date
    Jan 2010
    Location
    Houston-ish
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    Default

    There was something going around about that thought process a few months ago. basically, as Ron said, it's a tortured interpretation and I would expect some feedback about it.
    Houston Region
    STU Nissan 240SX
    EProd RX7

  7. #7
    Join Date
    Jun 2005
    Location
    Kansas
    Posts
    532

    Default

    Quote Originally Posted by jimbbski View Post
    Just asking a question here: Couldn't you consider the steering system on a rack-n-pinion steering system part of the suspension? The tie rod is a link in the suspension and it's connected to the rack which is connected to the K member with bushings....
    I don't know how you came to the conclusion that the tie rod is a link in the suspension, but I disagree. You can leave the tie rod laying on the shop floor and still have fully functional "suspension", as defined in the GCR technical glossary - "A mechanical system of components controlling vertical motion and connecting the axle housing and wheels to the chassis of a car."

    IMO, the tie rod does not meet the first of two requirements in that definition.
    Gary Learned
    MiDiv
    Volvo 142E
    http://www.youtube.com/user/denrael

  8. #8
    Join Date
    Feb 2001
    Location
    Tampa Fla
    Posts
    430

    Default

    yes there is a kit out there to correct the issue of bump steering in a lowered mustang. it looks like a spacer between the tie rod end and the steering knuckle.

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