IRa11y Can you point me in the direction of a web site to calculate the spring rates?
I was just reading what was marked on the rear spring.
The struts are ae86 I think. When I put them on the car and took them off, I just swapped the front hubs over and they were standard AE86 brakes.
Not sure what insert is in them but they are adjustable a bit like Koni's where you can turn a flat tip at the top to make it more or less firm.
I took some measurements.
the rear springs are 29cm high.
From the bottom of the strut to:
bottom of thread is 32cm
top of thread is 43cm
top of coilover is 63cm
Hope it helps a bit.
I will try to find out more info, but as I said, they came with the car.