Reply to "Pantera steering rack question......"

David.
Bump steer is caused by the wheels toeing in or out during suspension travel.
To eliminate bump steer it’s more to do with the rack & pinion mounting position & its length.
Increasing both top & bottom suspension arm length & compensating by offsetting the rim further inward will decrease the negative effects of scrub radius where the steering wheel tends to “kick” when the outside edge of the wheel hits a bump.
So effectively what you are doing here is decreasing the distance between the outside edge of the wheel & the steering axis, (the top & bottom ball joints that the wheel pivots upon).
Another way of decreasing the scrub radius is to have a longer lower suspension arm, combined with a suspension upright with a different stub axle angle.
Example:
If you fitted a longer lower arm the wheel would go into severe positive camber, (top of the wheel leaning in).
To compensate the best way is to fit a new upright which brings the axle back to horizontal to the ground.
If you draw a line between the top & bottom ball joints & where that line intersects the ground the ideal intersection point is the centre of the tyres contact patch.
So the wheel/tyre pivots on the centre of its own axis.

The problem with the Pantera steering is that intersection point is a long way inboard of the wheels centre.
Fitting wider front wheels that are widened further outward exacerbate the problem.

Regards,
Tony.