As engine speed increases, what does the increase in pressure and the shorter amount of time the injector opens determine?

An increase in engine speed leads to a higher demand for fuel in order to maintain engine performance. As the engine speeds up, the amount of time the fuel injector remains open decreases, which means that fuel must be delivered in a shorter duration. Consequently, the pressure within the fuel system also affects the volume of fuel that can be injected in that brief period.

When both the increased injector pressure and the reduced opening time are considered, they directly determine the quantity of fuel that reaches the combustion chamber. A higher pressure allows more fuel to be atomized effectively and more fuel to be injected in the limited time available. This precise control over fuel delivery is crucial for optimizing engine efficiency and performance at higher speeds.