Didn't understand your reference to "rack", and assuming you have a 4-bar car, or at least torsion bars on the front, and the steering box/gear is mounted in the cockpit, moving the torsion arm angles up/down, does effect the panhard bar angle, and can change the steering characteristics, usually the arm angles are adjusted, to transfer weight differently, side to side, and front to rear, it is a method of moving weight around, and yes, it does effect the steering effect, and how well or poor it responds, and the panhard bar has an influence on this also. There is more to setting up a car, then just turning a screw here and there, and no two drivers like the same thing, there is usually a place to start, setup blocks, some guys can get one close, if they are familiar with the car, can get one close, just by how it looks, those guys are not easy to find, and really are the ones you need to ask, if you can get them away from the one they are working with. Another factor, is if it's a combo car, or track surface specific, dirt or ashpalt, and how it was designed, a good driver, can usually drive a poorly set up car, but is able to take full advantage of a good setup. Bob!
