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Originally Posted by Ecky
Even better than ITBs is moving the "throttle" right to the valves. Honda's R series engines (2006+ Civic) vary the intake cam to control valve opening and therefore throttling, under some conditions.
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Just think about Fiat's Multiair engines, or that Freevalve system.
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It still has a throttle plate, but that gets held wide open when it changes to variable valve timing throttling.
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On the newer iterations of the Fiat Multiair engine series, the throttle plate was retained mostly as a quick vacuum source for the brake booster.