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I uploaded a simple roll center calculator for a S30 in the uploads section.




I developed it because I like to set up my suspensions using the control arm angles.  Fast and easy.  If you need more info on what a RC is or does, there is large amount of info on the web.


There is also plenty of debate on this forum on where you should set the RC and I wish I could tell you the best place.  But when suspension tuning everything is a compromise and "best" is usually a combination of things, depends on your goals, and will change from car to car. 

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Just checked my calculations about roll-center(s). Seems like in my car r-c is ~65mm front and ~115mm rear. Should be decent compromice. Bit of a job to get those figures, with my "modified" suspension.

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