Dedicated AutoX/Track Spring Rates

///MSH

Update...I got all my measurements and calculated rates/ratios. Hats off to 03threefiftyz and everyone else who chimed-in. I'm now torn between Penske 7500 DA and Ohlins TTX....any objective reasoning to a preferred brand/builder is welcomed.

Also, the math says I could go between 1000-1200 lbs up front, and I would likely ratio that to the rear based on the factory split as a percentage (I like my current balance). I wonder if this is TOO stiff. Any thoughts as to where the limit is? I run 295/315 Hoosier A6's

Hope to have something on order within a week or so.....

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2011 Nismo with...Stillen Gen3 CAI, FI LTH's, Stillen CBE with Springfielddyno rear section. Stillen under drive crank pulley, UpRev, and LW flywheel. Penske 8300DA Valved by ANZE, SPR FCA's, Stillen F/R adj. sway bars, Enkei PF01's, and Hoosier A6's