Expert: Dan Liddy - 9/30/2010

Question
I understand that in order to make a car less loose or less tight (i.e. neutral),
several changes may be done during a pit stop (assuming that camber, etc.  
can't be adjusted outside the garage): air pressure, track bar, wedge (made
with a wrench through the rear window like the track bar), rubber spacers
introduced into the springs, etc.  My question is there a hierarchy among the
possible adjustments?  For example, I understand that an increase of 20 psi is
equivalent to increasing the strength of the rear spring(s), loosening up the
handling.  Why choose one solution over another?  Probably an unanswerable
question (else Chad would have figured it out), but thanks anyway.

Answer
Generally, if the handling presents a minor problem, a minor adjustment is made. If the problem is more severe a larger adjustment is made
.  
There is a very complex series of things affecting the handling, and a little of it can be divined from tire temperatures.  Other than that a lot is left to driver input.  If your driver has a dead butt, you're in trouble.

The most minor adjustments are with tire pressures, lowering and raising the track bar, is probably the most dramatic.  But every thing that's done has it's effect on the front as well, hence altering the tightness.

It's a black art and I'm REAL glad I work with road racers, it's simpler.  

I wish I had better answers !

Dan Liddy
Sarasota, Florida