Originally Posted by kuah@splparts.com

Tony is using the dampers from his Stance coilovers, with the springs removed. There should be no difference in the performance of the dampers, as the motion/velocities seen at the shock should be similar regardless whether the spring is mounted on the damper or at the mid link (with equivalent spring rates given the motion ratio difference).

Originally Posted by Gsedan35

Interesting to see your conversion calculator, looks like you've measured the rear motion rate at around .776.

http://www.splparts.com/main3/Parts/...Calculator.xls

465lbs X .776 X .776 = 280lbs

Originally Posted by Q45tech

I measured the FRONT lower arm length @14" and the spring closest point [length along arm from frame] @11" this results in a spring to wheel correction of 0.61 so a spring speced at 300 pounds per inch would really expert 300 x 0.61= 183 pounds per wheel inch. If you jacked up the wheel by 1" it would require 183 more pounds than static...........discounting sway bars this means the front roll rate stiffness is ~~183 lbs per inch.

So a 20% stiffer spring only truely increases FRONT roll stiffness by 20 x 0.61 or 12.2%.

Worse add in the sway bar and a 20% stiffer spring may only add 1/2 -3/4 so 6-9%.

Originally Posted by thinking

FYI, he indicates a similar calculation of .61