The springrates will of course be determined by the wheel rate, weight and the desired frequency. The prinicple being to keep the springing soft and the damping firm (Chapman principle).
I had a look at the Nascar units but I would have thought that with a development car that the blade type anti-roll bar would give a greater range of adjustment. The Nascar units might be far to stiff for a lightweight bug especially as they are very heavy and circulate on banked ovals at 200+mph. The roll force must be particularly high.
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