Throttle
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A throttle is a mechanism by which fluid flow is managed by construction or obstruction.
Throttle body showing throttle position sensor. The throttle cable attaches to the curved, black portion on the left. The copper-coloured coil visible next to this returns the throttle to its idle (closed) position when the pedal is released.
Image of BMW S65 from the E92 BMW M3 showing eight individual throttle bodies
Gasoline direct injection
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Gasoline direct injection, also known as petrol direct injection, is a fuel injection system for internal combustion engines that run on gasoline. It injects fuel directly into the combustion chamber,
Throttle
…or gas pedal. For a gasoline engine, the throttle most commonly regulates the amount of air and fuel allowed to enter the engine. However, in a gasoline direct injection engine, the throttle regulates only the amount of fuel allowed to enter the engine. Historically, the throttle pedal or lever acts via a direct mechanical…
GDI engine from a BMW car showing a fuel injector (located above the red triangle) placed to spray gasoline directly into the combustion chamber
Swirl cavity recessed into the top of a piston in the 2010–2017 Ford EcoBoost 3.5 L engine