The main thing to consider when choosing spring rates is the tire you will be running and the surface that you drive on most regularly. The springs job is to make sure the tires stay in contact with the road. A lot of the times, a more compliant suspension will be faster than one that is overly stiff. Just food for thought. I would stay away from getting into the 2.3+ hz range unless I was running r compounds on a well groomed track, especially if The car is dual purpose.
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