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Message: <blockquote data-quote="Daniel" data-source="post: 160487" data-attributes="member: 1260">Throttle response with fuel injection has been somewhat of a chore to get right by all the manufacturers. Various styles of exhaust valves, flaps in airboxes and servomotors whirring and whizzing away have only gotten close to the Holy Grail of throttle response. To date, engineers got the bright idea to make fuel injection work like a carburetor by employing a CV carburetor slide controlled by vacuum created by the engine, just like on CV style carbs. This ensures that the motor only gets as much fuel as it can handle for a given rpm. On the exhaust side, the valve aids the smoothing and organizing egress of spent air and fuel mixtures. This valve also constantly adjusts the internal diameter of the exhaust to match engine rpm.</blockquote>