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Whats the difference between underdrive and overdrive?

April 26, 2017difference OverDrive underdrive

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Whats the difference between underdrive and overdrive?

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The drive ratio of a supercharger is the speed of the supercharger in relation to crank speed. A drive ratio of 10% underdrive means when the engine is running 6000 rpms, the blower is running 10% slower or 5400 rpms. Overdrive is when the crank pulley is larger than the upper pulley, underdrive is when the crank pulley is smaller than the upper pulley.