Torsion-Bar Springs
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Torsion-bar suspensions do have some drawbacks. The biggest problem we see is that it is almost impossible to have a progressive-rate torsion bar. Some OEMs have compensated for this by designing the suspension to ride on jounce bumpers (don't call them bumpstops!) to effectively get a progressive spring rate at the wheel. But this still leaves the problem torsion bars have of limiting the amount of compliance that can be designed into the suspension. Compliance is a term used by suspension engineers to describe the up-and-to-the-rear path the tire should ideally take as the suspension compresses. A torsion bar will not permit this complex suspension motion without buckling the bar. View Related Article
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