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I understand that the higher spring rate is not the best choice. I have read the book (Vehicle Dynamics and Damping) which was written by the founder of JRZ suspension.
For me on my Motons I am happy with my 800lbs front and 450lbs rear (true coilover). My car is pretty much full weight and I am about 200lbs
Suspension geometry plays a role in the rate you use but seems kind of strange in my opinion when the E46 race cars/some track cars are running higher rates than the e92? Here is a copy of what James Clay said for the E46 M3. Not saying this is the way to choose rates, but makes me think more about using lower rates?
"Agree with a lot of this. Rates are a function of the chassis (and weight), use, tires, some other lesser things, and constrained by the damper.
E46 M3 - 3300#
Ideal track rate (no Aero) 800/900 - 900/1000
Comfortable street rate depends on damper - up to 600/700 with an MCS for my preferences (my DD/test mule/non-track version has these)
Those are a little much for a TCK Koni with standard valving and 4100, but the GC DA can handle that 600/700 or a little more well.
Dampers have the larges effect on feel - that's the reason they cost what they do for good ones and 4 winds of steel in a spring are $300 - invest there and do it once..."
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