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Oh, and torsion bars are "straightened" coil springs. They twist under force, then come back to stasis. A coil spring's wire really is twisting as it compresses. So it is more the metal wire's twisting action, not so much the compressing of coils, that provides the spring resistance. For all intents and purposes, they are identical. The decision for one or the other is more an issue of packaging and/or ease of adjustability and tuning (the latter point even more important in racing) that determines which to use.
Edward
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993: retired Trackmeister, now daily driver heaven
911SC: resident Trackmeister-in-progress
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