Quote:
Originally Posted by strictlypersonl
Mark,
Unless you are planning on ripping all the attachment points off the chassis, the most important factor for stable driving is the bump-steer curve. That can be measured with relatively cheap/simple tools. Once determined, it's not too hard (relatively) to change the steering gear position and tie-rod length.
If you buy that software, you will have to spend 10's of hours measuring your attachment points, etc. A nice intellectual exercise, but of little real use - your car is already built.
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I agree with you 100%- but inmy case the car was built POORLY. I definitely will be moving suspension points, steering rack ect. Just a couple of examples I have figured out so far from reading/researching:
1) steering rack is about 4 INCHES too wide: from what I have read, to minimize bump steer the sterring rack inner pivot points are supposed be on the imaginary line between the upper and lower A arm inner suspension pivots, and they are INCHES off on each side. The way is is now, any bump steer correction will give perfect bump steer at ride height +/- about 1/4" of travel, then all hell breaks loose.
2) the imaginary lines created by the upper and lower rear 4 link arms are supposed to cross somewhere close to the front of the car, but they actually point BACKWARDS and no way to adjust that out
3) lower A arms at ride height are nowhere near level, they point up about 2" from chassis to where they attach to the uprights. Drop spindles will fix that, but then i have no idea what happens to camber curve etc.
4) I have the old school lower "A" arms that have the strut rod rear arm that connects to the chassis- problem with that is, it severly limits steering angle as tire rubs on the strut arm, sterring radius is probably worse than my 3/4 ton diesl pickup
so no auto X possible, I'd have to do 3 point turns in the hairpins
Sooo, bunch of stuff to chop out and re-do, my son is a metal fabricator so I have free skills to use
but if I'm re-doing it, I want to do it right. I'd like to auto-X or something occasionally. Impossible now.