great thread! My setup is: Illuminas, 225lb/in front, 250lb/in rear. No rear swaybar (removed) and stock front (unfortunately). I am also running poly bushings (the rear control arms were fun to install with the new bushings! lol). I had my front struts on 4 and the rears on 3 thinking that since the front was harder it would grab sooner. haha... I would understeerlike crazy!!! I then swapped the font to 3 and the rears to 4 and it is VERY neutral! I still have to finish my suspesion off with weld in camber plates, bigger sway bars, strut bars...
I don't see how that 240Z could be good handling with a difference of spring rates front to back. 400 front, 250 rear sounds like a lot. I guess it depends onthe settings the car has though. I was going to do my first autox event this summer but my engine decided it had enough already.