Why BMWs Don't Need Throttles

How BMW's Valvetronic Works (In 60 Seconds)
Detailed Explanation of Valvetronic -    • What Is Valvetronic? BMW's Innovative...  
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Did you know some BMW engines don’t need throttle valves? These valves are used to regulate how much air an engine gets, and thus how much power it makes. The more you press the accelerator pedal, the more the throttle valve opens. BMW uses a different strategy, which requires a complex system called valvetronic. This offers theoretically infinite intake valve opening variations, by using a worm gear that rotates a cam to various positions.

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