The factory BMW flywheel is a 2 piece design that mitigates vibration and creates a comfortable driving experience. A single piece aftermarket flywheel will allow the engine to rev quicker and gives shifting a much more direct and mechanical feel. This also makes clutch modulation on spirited takeoffs much easier and more predictable and is a must if you plan on tracking or competing in your BMW.
A dual-mass flywheel is a two-part unit. A smaller-diameter flywheel bolts to the engine and sits inside of an outer flywheel. The smaller flywheel engages the larger one via a set of springs. This design offers a bit of buffering between the engine and transmission to enhance smoothness during clutch engagement. The first sign a dual mass flywheel is failing is a rattle when depressing or releasing the clutch. That develops into sounds like clutch chatter even after full engagement. This malfunction will typically occur during initial engagement and while shifting through the lower gears.
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