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Eliminating Bump Steer on an FC.

Old 05-09-05, 12:17 PM
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Question Eliminating Bump Steer on an FC.

I have a bump steer issue on my FC.

The car:
Lowered about 1.5
1 extra of caster and 1.5 extra camber up front, otherwise factory alignment specs except.
Manual steering (power rack for a quicker ratio but no pump)
245/45/R17 R-compounds on all 4 corners.

We have been autocrossing on a bumpy lot and the bump steer is killing me.

Does anyone make rod ends to fix this? Spacing the steering rack is not an option because there is a motor in the way.

Thanks for any info!
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Old 05-09-05, 04:51 PM
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you sure is bump steer? did you measure it ? or your shocks is button out ?
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Old 05-10-05, 04:29 AM
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Jack the car back up.
Why you got it so low???

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Old 05-10-05, 07:11 AM
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I can custom machine the parts you need. If you like, PM me.

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Old 05-11-05, 01:02 PM
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I noticed when I put camber plates on my bump steer disappeared, but also they lifted the car a good 1/2".... saggin stock rubber.
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Old 05-11-05, 01:20 PM
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If it really is bumpsteer it will need to be fixed at it's connection to the upright. You should get the car on a good alignment machine and measure the bumpsteer.
What is the offset of your wheels. You might also be feeling kickback through the wheel which is more a result of caster and scrub radius.
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Old 05-11-05, 03:04 PM
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change ur balljoints
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Old 05-13-05, 10:08 AM
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Diyman 25, bump steer is when the steering changes with suspension travel due to a mis-alignment between the suspension arm geometry and the steering arm geometry. The best way to avoid the problem on a strut based car is to position the steering link directly in line with the lower suspension arm so the pivot points on both parts are the same. Most times this is not possible so you have to do the best you can. If the arms are parallel (steering and lower suspension arm) the effect is drastically lessened.

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