Reviving a very old thread......
Been doing a tidy up on the front end after I discovered a worn inner tie rod end. Thought I would change a few things and stripped the whole lot off and:
* Got it all powdercoated - the poor 15 was looking very tired.
* New uprights and larger stub axles as I suspect I was getting axle flex when braking
* Changed to series I straighter\asymmetrical upper arms so I could get a little more castor
* New poly bushes all round
* New ball joints
* Heim joints instead of tie rod ends so I can play around with the bump steer.
So I originally had a spacer so the rack is 25mm lower than stock, but I found when I flipped the joints to the top of the steering arm the Bump steer was awful. It was actually so obviously bad I didnt even take a measurement. Here are the plots with the joint mounted below the arms and spaced different amounts.
19mm is probably has the least bump steer, but that spacer ends up a bit large so I will try and move the rack back up about 9mm and use the single 10mm cone spacer I have to get enough clearance on the joint.
Ill put some pics of the setup shortly. If you have flipped that joint to the top of the arm though I would take a good look at the bump steer - its probably not as bad as I saw if you haven't spaced the rack, but worth checking out.
Cheers