What spring rate would be most desired ??

Can anyone tell me what spring rate would be the best match for shock like this ??

http://www.ziptied.com/Coppermine/albums/userpics/11065/frontdynosm.jpg

depends on vehicle weight, corner weight, unsprung weights, the motion ratio of the suspension and a few other things. I don't think what you are asking can be answered correctly.

Judging buy those graphs, the rates, regardless of adjustments, seem mostly linear, so I'd at least say linear and not progressive rate springs. Remember, springs control the car, dampers control the spring. Dampers are usually tailored to springs, not the other way round.

Thanks guys. Its going to be installed on 07 sti. Car is in street trim so it weight about 3300 lbs. Motion ratio of susp is 1:1 ( at least I was told so ). I don't have corner weight at this time ( car is on stock strut/spring combo ). I'm using 24mm front sway bar and 22-24-26 rear sway bar set on 24mm and Im on street tires (Dunlop Z1). This coilovers come with 8kg front spring. I hope that info helped. So can I go higher on the spring rate ?? what about 9kg ?? will this shock be able to control it ??

1kg/mm is about equal to 52lb/in IIRC, so yeah most dampers can handle a modest rate increase like that without revalving, especially an adjustable unit.

Appleseed wrote: Dampers are usually tailored to springs, not the other way round.

^this