So now let's look at some of the things you can change to make the bump steer better ....
1. Move the Rack..... moving the rack will change the arc of the steering arm and have a change on the Bump Steer. Up and down and also Fore and back....
2. Move the Steering arm Heim up or down to again change the arc of the Racks arm and change the bump.... this is usually just a fine tune for the major changes...
3. Change the Top of the upright so that the upper control arm is in a different position for it's arc there by changeing the steering as the upper control arm moves in with more camber gain....
4. Change the location of the Steering arm on the upright..... it's very important to have the steering arm on the upright in the right location....
In this set of numbers we changed the rack and lowered it by 1/8" from spacers that were 5/8" down to spacers that are 1/2"..... these are the spacers under the rack.....
You can see that moving the rack 1/8" made the numbers worse...... but that's a indication of how sensitive this adjustment is.... as small move will make a large change in suspension geometry....
Now it goes from .473" In ...... in bump ...... to .275" in droop.......
Which is almost 3/4"...... now if you hit a bump..... the car would jump over a fence....or another car if one was next to you.....
Obviously lowering the rack is not the thing to do..... but can we raise it enough to make it work....
