Spring rate for rear coilovers

[Wally]

Lee Arnold (LAperformance) is said to make very nice rear coil overs specific for 944 alu arms in bugs with adjustable shocks for 300 pounds or s/th?
I would probably use those if I'd go additionally coil-over on the rear.

[evilC]

With the Uniball set up you will be loading the top bolt fixing on the dampers to >700lbs that puts a considerable bending moment on the 12mm bolt and a substantial twist on the forged arm so it is vital that the forces are redistributed back into the chassis. A full 5 bar Kafer Cup brace is the solution for this.

As regards to the spring rate you can compare the current wisdom on torsion bar selection - 23.5mm dia for mainly street and 25.5mm dia for mainly track with the equivalent wheel rate and then convert that back to the coil spring rate. It all revolves around lever arm lengths. The torsion bar conversions are available on the web - just Google. Coil springs in especially 2 1/4" dia are readily and cheaply available so it is feasible to try some different poundages around the starting point even to the extent of taking corner weights into account.

When you have decided on the spring rate talk to the damper suppliers about appropriate dampers.

Clive