[Bender]

Hi Guys. A little bit of info on bump steer. On the ASRF website Hot Rod build guidelines. They have a basic rule of thumb for setting rack height, length of steering arm and position of rack balljoint in regard to bump steer. If you draw a line between the lower control arm inner pivot and the top control arm inner pivot. Whatever height you position the rack.The ball joint of the rack should be on that line. Simple Huh.
Most racecars have the rack ball at the same height and position as the lower control arm inner pivot. The outer tie rod end centreline height is the same as the outer balljoint. That way camber changers can be made for wet and dry conditions without needing to redo toe in. Also zero bump steer. I realise sometimes there are other restriction that means we cannot achieve those goals. Building modified/competition cars is always a case of best compromise.
Bender