I agree with noob4life that alot of people undervalue the stock suspension setup, which already has alot of R&D effort put into it. Only when you feel you have mastered the behaviour of the stock setup can you intelligently go about the process of evaluating further mods.
Case in point - my IX RS comes stock running the supposedly not-so-good KYB dampers but thus far, aside from getting alot of body roll, I have found that the car actually handles very well straight out of the box with the alignment set to 0 0 0 0 all around! This leads me to question my recent purchase of a set of KWV3s and a bunch of whiteline goodies because my stock car is very capable. Needless to say, I will be starting off with a very conservative base tune for the new setup and tune it gradually from there over time.
In the absence of a proper suspension engineer, the best thing to do is troll the internet for advice but test everything yourself. Trial and error is the name of the game - pays to record your settings and make notes on each change in setup - there are alot of variables to consider such as tire presures, alignment, ride height, plus spring rates, ARB settings etc. Recording changes to these is the only way to make sense of it, otherwise it's easy to simply change things for the sake of it without any quantifiable benefit, possibly ruining the car's handling in the process. Also, without consistent driving any data collected is quite questionable at best.
I suggest:
1. record all settings
2. drive the car extensively in different situations
3. alter one variable and drive drive drive
4. record the result
5. return to previous settings
6. go back to step 1
One thing I like to do is change one thing to an extreme amount (i.e. raise the rear tire pressure waaay up) and record the result, then dial it back in steps until arriving at the original state. This way you can gather info on how different things affect your car. It takes time but it's the best way IMHO. Tweaking combonations of different things at one time will only give you major headaches trying to unravel what setting is doing what.
There's no "magic killer setup" out there, since we all drive in different ways and in different conditions. Gotta find your own mojo.
PS ghoonk it pays to have some decent rubber to begin with
