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Originally Posted by Dean
I'm not entirely sure that is true. Perfect springs don't take a set, but I'm not aware of a spring material that is perfect.
Unless the springs have been previously placed under similar load for some length of time after manufacture, they will have a tendency to settle under their initial load as the spring material reaches equalibrium under load. With extrmely high quality springs, this may be minimal, especially under relatively light loads and high spring rates found in race cars, but is common on street car suspensions.
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What I'm referring to is that with a good quality spring, I can take it out of the box, measure its free length & rate on the spring tester, put it in a car and drive it around for a couple months, pull it out and recheck free length & rate, and they will not have changed measureably. With a cheap spring, they will. That's all there is to it.