Intake Manifold Tuning (IMT) Valve Solenoid
The characteristic torque curve of a normally aspirated engine depends mainly on how the engines average pressure changes over the engine speed band. The average pressure is proportional to the volume of the air mass present in the cylinder when the inlet valve is closed. The design of the inlet system determines how large an air mass can be drawn into a cylinder at a given engine speed.
An intake manifold tuning (IMT) Valve (2) is used to change the intake manifold runner configuration. When the IMT valve is open, the intake manifold is configured to one large plenum (4). When the IMT valve is closed, the intake manifold is configured to two smaller plenums (3). The two intake manifold runner sizes result in different torque curves which improves performance at low and high engine speeds. The IMT valve is located in the intake manifold (1). The IMT valve solenoid is supplied with ignition 1 voltage and is controlled by the engine control module (ECM).