T: What's the difference between a sprung and unsprung center hub?
S: For a traditional flywheel design (not dual mass), springs are placed in the center of a clutch disc to reduce transmission noises caused by the torsional vibrations (rotational pulses) of the engine.
A spring center disc will operate quieter and reduce wear on the center splines of the disc.
A rigid center disc, being lighter, will shift faster, engage smoother with high-friction materials, and avoid spring failures.
They're race parts and aren't intended for high-mileage applications, since the splines tend to wear out prematurely from the vibration.
Torsional vibration will increase with fewer cylinders, higher compression, hotter cams, higher boost, timing, lighter flywheel, or many aftermarket harmonic balancers
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