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From an old post I wrote in 2008 (http://forums.turbobricks.com/showpost.php?p=2042980&postcount=26
IPD Nivomat Delete Rear Springs:
92.5 lbs/in. Free Length: 20". Compressed Length ~8" (1100 lb load on each spring)
You can start a new thread in performance, but the main thing i see is you have not factored in the rear control arm motion ratio (squared).
Multiply the rear spring rate by 1.5 and that is what the vertical rate is.
The front loses a little bit (5%) due to the angle.
Also, s10 shocks only work with 11? springs or shorter.
This might need its own topic, but let?s say you were going from a completely stock suspension to a bne coil over set up on a 240 wagon. Koni yellow shocks/struts. What spring rate would you want to run and what length? Let?s say we?re setting the car up to autox and/or do some laps around road Atlanta.