Originally posted by dailyrider
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Also, a recommendation on your spring rates that's totally unasked for. That front rate is waaaaayyyyyy too high. The motion ratio of the rear suspension of an E30 means the wheel rate is, in reality, about 60% of the spring rate. The front is close to 100%. This means that in effect, your rear springs are the equivalent of 10K front springs.
I have almost the same coilovers, with a similar suspension setup (Z3M). I have tried an uncountable amount of spring rate combinations, and landed on 10K/18K as perfect. The ride quality difference going from just 12K to 10K was dramatic. There is zero chance of a street tire being able to handle 16K worth of spring, the front of your car will skip and bounce along the roadway rather than absorb the undulation and keep the tire planted. Again, totally uncalled for, but I'm telling you. The best mod you can do is 10 or 12K front springs to re-balance your car and let the front struts actually move.
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