1/8 of movement/turning of the spindle is a lot at the tie rod end, probably 3/8" of movement of the tire back and forth...that is more than I would like to get in my b-body
1/8" of movement is a lot at 3 inches of compression?
Think about what is going on a 3" of compression....low speed high G corner... The spindle will be at a high turning angle and straight line bump steer doesn't apply much.
The two measuring points on my commonly used bump steer gauge are 16.5" apart. A typical tire is 26".
I showed my results shown below with a guy that crew chiefs K&N Pro Series championship cars and full time designs and builds his own multi track championship cars. 1/8" of bump with the same style gauge I used at 3" is still good and he said don't mess with it. He did say 1/16" would be very good. Of course we're talking cars set up for handling. Not Drag cars.
Getting .001" at jounce AND rebound at 3" is nearly impossible. That's not reality if you've ever did this or did it regularly.
