Intake Manifold Runner Control System

Intake Manifold Runner Control (IMRC) system uses a series of valves inside intake manifold to control length of intake air path. Intake air path has 2 lengths; short and long. Increased engine torque or power over a broad operating range is achieved by using valves to switch between paths. This results in high torque at low engine speed and high power at high engine speed.

High torque at low speed is achieved when IMRC valve(s) are closed. High power at high engine speed is achieved when IMRC valve(s) are open.