I have seen a few tuning guides on the net and there all good but I really haven't seen any hard fast rules. I think I have a few. Let me know what you guys think.
A really good starting setting for the shocks is 30wt/30wt.
Set your side springs as soft as the lay out will let you. And by that I mean find the fastest, tightest direction change and see if the car goes threw it or if your waiting for the car to change direction. You shouldn't have to lift off the throttle for the car to change direction. Too stiff of a side spring and the steering will get twitchy right off center and it will start to throw the rear into the corner. This action starts to show up as double steer then gets worse. When I went from a gold side spring to a blue one, the car went a tenth faster. Then from the blue to silver it didn't get faster but it was more consistent. Any softer and I bet it would have slowed down. Pretty quick and easy to find the right side springs. Then fine tune the shock spring for the on-power steering you like.
There you go. Caster and side springs will get your chassis 90% there. Then fine tune the tires, aerodynamics and oils to finish it off.