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Originally Posted by McRussellPants
people confuse bad aligment and tramlining with bumpsteer.
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Someone with common sense.
Bump steer isn't quite as it's name emplys. Bump Steer is when your wheels steer themselves without input from the steering wheel. The undesirable steering is caused by bumps in the track interacting with improper length or angle of your suspension and steering linkages.
In order to accomplish zero bump steer, the tie rod must fall between an imaginary line that runs from the upper ball joint through the lower ball joint and an imaginary line that runs through the upper a-arm pivot and the lower control arm pivot. In addition, the centerline of the tie rod must intersect with the instant center created by the upper a-arm and the lower control arm.
The instant center is an imaginary point that is created by drawing a line from the upper a-arm ball joint through the a-arm pivot where it is intersected by an imaginary line that extends from the lower ball joint through the inner control arm pivot. Where the two imaginary lines intersect is the instant center.
S14/S15's have similar suspension geometry as the s13. There is no real front upper control arm.
Purchase angle adjustable tie rod ends. They will allow you to run the tie rod parallel to the ball joint. By the sounds of it, you also need alignment.
Pm me if you have anymore questions.