Intake Manifold Tuning Valve System

INTAKE MANIFOLD TUNING VALVE SYSTEM DESCRIPTION

INTAKE MANIFOLD TUNING (IMT) VALVE SYSTEM
The intake manifold tuning (IMT) valve system uses variable air induction tuning in order to achieve maximum performance and efficiency over the entire operating range of the engine. The characteristic torque curve of a normally aspirated engine depends mainly on how the engines average pressure changes over the engine speed range. 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 IMT valve is used to change the intake manifold plenum configuration. When the IMT valve is open, the intake manifold is configured to one large plenum. When the IMT valve is closed, the intake manifold is configured to two smaller plenums. The two intake manifold plenum sizes result in different torque curves, which improves performance at low and high engine speeds. During low speed, high load conditions the IMT valve is closed creating a longer runner path inside the plenum, which increases torque. During higher engine speeds and loads, the IMT valve opens creating a shorter runner path inside the plenum, which increases horsepower.

The IMT Valve assembly consists of the following:
- A tuning valve
- A micro-processor
- An electric motor
- A hall-effect switch
- An ignition voltage circuit
- A ground circuit
- A variable tuning signal circuit
- An IMT fan position signal circuit

IGNITION VOLTAGE CIRCUIT
An ignition voltage is supplied directly to the IMT valve assembly through a 10-amp fuse. The ignition voltage provides power to a microprocessor and to a motor that rotates the IMT valve within the intake Manifold.

Ground Circuit
The ground circuit is supplied directly to the IMT valve assembly. This circuit provides a ground for the micro-processor and the motor.

Variable Tuning Signal Circuit
During operation the control module applies ground to the variable tuning signal circuit which indicates to the microprocessor within the IMT valve to turn the motor ON which rotates the IMT valve within the intake manifold plenum.

IMT Fan Position Signal Circuit
When the IMT valve is rotated the hall-effect switch detects the movement and provides a signal to the micro-processor which provides a feedback signal to the control module. The control module uses this feedback signal to determine the position of the IMT valve.