I had an error in my spring spread sheet and the springs I ordered are kind of stiff and mismatched
It looks like the 900 front should pair with 575 rears and yield 2.6hz which is kind or moving into downforce car territory.....but still softer than the simple sag math suggests I want. I generally prefer stiffer springs and small swaybars so I'm going to let this order roll I think.
A buddy has 580/380 and that is 2.1....so kind of the other end of the autocross/track range spring wise with 1"/.875" sway bars and says its good. With the heavier springs I'm going to stay where I am swaybar wise, 3/4 front, nothing rear and see....I suspect it will want a bit more front bar....but I need s running engine to be sure.