A throttle body in a fuel injected car such as the Civic Si is a part on the air intake system which adjusts depending on input from the driver. The driver controls the how wide open the throttle body is through the use of the gas pedal. The wider open the throttle body is the more air flows into the chamber creating a higher ration of oxygen in the fuel air mixture which is actually used to create the controlled explosion that propels the car. The Civic Si throttle body is designed to allow a greater degree of air in to create a more efficient reaction. This functions in conjunction with a performance air intake to ensure that the maximum amount of air is delivered to the engine under load which leads to better acceleration and more high end horsepower.
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