Completely depends on corner weights and if you are trying to lean the car towards more understeer or more oversteer.
On my first set of coils(soon to be installed). I have opted for 10KF/12K rear. This will produce a front ride frequency of 2.0 and a rear of 2.3
2.0/2.3 = ~.86 which is on the understeer side, and is almost identical to the OEM ride frequencies. It's also almost the exact ride frequencies of the swift spec-R.
The mfgr's tune to this frequency on purpose, understeer is safe. Almost every single OEM vehicle is going to be close to this ride frequency. I figure I will stay close to OEM, but at a stiffer spring/wheel rate, as to not make too drastic of a change. The car will behave similar to it does now, but won't roll over as bad.
Now if you wanted to dial in some oversteer which is more typical of a race car setup(looser). You would bring the front rate much higher. Something like 14k/10K on oem spring location would produce
2.3/2.1 = 1.12. Which would be mild oversteer and is pretty well balanced and is probably what I will do next for a stepping stone.
The big no-no is to do something like 2.1/2.0 = ~1 as was explained to me by an engineer(this is not my math I just know the equations).
As he described it to me, anything in the range 0.9-1.1 is flirting with some real problems and can get you into trouble. You always want to aim outside of those numbers either towards understeer or towards oversteer.
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Current Mods: Vorpal Weapon +5.
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