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Originally Posted by petesamprs
I believe the CDV actually protects the transmission at the expense of the clutch, by slowing the linkup between the engine and tranny. So it's more to protect noobs from destroying the rest of the tranny by resulting in slower clutch linkage (more friction wear) if you try to drop the clutch at 6k RPM.
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The purpose of the CDV is to prevent shock on the driveline from someone dropping the clutch too quickly. If you'll notice, BMW runs significantly smaller (and therefore less rotational inertia) driveshafts than almost all other car manufacturers. These driveshafts can break if they're abused all the time by a moron. This is also the purpose of the guibo (or flexdisc) that is installed between the transmission and the driveline. Lessen the driveline shock.
-Evan