more lift to the superlift

[Matt]

My question is, how do you figure out the spring rate of a coil that has been cut down???

Number of turns in the coil is one of the design parameters in a coil spring. If you know the spring rate and number of turns, you can calculate a given constant for that particular spring design which takes into account wire diameter, coil diameter and shear modulus. Once you know that constant (C) then spring rate k = C/N where N is the number of turns in the coil.