Don-
Couldn't get to look at Nitron; the ronchampion website refused
connection and a search on "nitron" came up with a fertilizer company...
I just dug down in the far depths of my storage shed, and came up with
my OEM springs, the dimensions of which are as follows:
Front - free length 14", coil dia. 3", wire dia. .405, 15 1/2 free
coils.
Rear - free length 13 1/2, coil dia. 3 1/2", wire dia. .440, 10 1/2 free
coils.
Both front and rear are flattened and ground on the ends.
The Konis I was using are P/N 80R1786.
Without getting into the formulas, if you have FEWER free coils, the
spring is stiffer. The heavier the wire, the stiffer the spring. The
larger the coil diameter, the softer the spring. You can see that there
are several ways to create just the spring rate you're looking for by
varying any of the parameters. If you're interested in the calculations,
you can go to Fred Puhn's book "How to make your car handle", or
similar.
My Vixen came through with four springs and six shocks; two on each rear
wheel, only one with a spring around it. I'm not sure that's optimum,
but you can run two springs on each rear corner, just make them half as
stiff as one would be. If you ran 6 identical springs, the car would be
too stiff at the rear, which would cause fairly severe oversteer.
I gotta clean that storage shed out....
Best,
Skip
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