[TR] [Spits] GT6 Bump Steer

[Randall]

> Correct me if I am wrong but isn't bump steer the result of 
> the one end of 
> the tie rod, connected to the steering arm on the vertical 
> link, moves up and 
> down with the suspension while the other end, connected to 
> the steering rack 
> which does not move, remains stationary (in relation to the 
> car) causing the 
> angle of the tie rod to change and hence the horizontal 
> distance (which is the 
> cosine of the angle) between the tie rod end on the rack and 
> the tie rod end on 
> the steering arm to change?  (talk about a run-on sentence!)

Well, not quite.  When the suspension moves, it moves through an arc.  If
the tie rod follows the same arc as the steering lever, then it's effective
length will not change.  Since one end obviously follows the lever, the
other end needs to be at the effective center of the arc.

If memory serves, bump steer can also be caused by changes in camber as the
suspension moves.

Randall 
(Tedious but unavoidable disclaimer follows) 






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