With a lap time of around 1:36, the throttles will, on average, change position every 0.87secs, quicker than a human can blink. On a track such as Sepang, where wide open throttle time is equated to 60% of the lap, this translates to around 110 movements in the throttle, moving from completely open to closed and any position in between. All the throttle valves are controlled via the accelerator pedal but the demand for power is sent via a signal to the ECU that then directly controls the exact position of the throttle valve through a number of maps. A throttle can go from completely closed to completely open in 10 to 15 milliseconds, the duration of light for a photo flash strobe.
When the throttle is closed, no air enters the engine and the combustion process is temporarily suspended. The throttle therefore dictates the amount of fuel burned on each cycle to produce efficient power. Fuel will be injected just before the inlet valve and hence the combustion chamber, and the spark plug will ignite the fuel and oxygen content in the air. When the throttles are open, air enters the engine unit. In a V8 there are eight throttles on the top of the engine unit that control the amount of air that enters each of the engine cylinders from the airbox.
In this feature we explore exactly what they are, how they have changed over the years and how Renault Sport F1 has optimized their operation.Ī throttle has come to be associated with any part that controls the power of an engine – such as the accelerator pedal – but in actual fact it is a hydraulically operated mechanism used to increase or decrease inlet gases to the engine. Throttles are one of the most important components in an F1 engine.
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