What is the spring rate in PSI for the stock suspension springs on a Datsun 240Z?
The calculated rate in pounds per inch for the stock front springs on a 1971 240z is ~100 lb/in. The data used was from direct measurement as follows:
8 active coils
0.437 inch coil diameter
4.447 inches spring outside diameter
torsion modulus (G) 11.5 x 10E06 psi