Turbocharger - Vehicles With INGENIUM I4 2.0L Diesel 180PS Engine

The Variable Geometry Turbocharger (VGT) is an exhaust-driven centrifugal air compressor which increases power output by supplying compressed air to the engine. The turbine wheel of the VGT extracts energy from engine exhaust gases to drive the compressor wheel.

The compressor wheel draws in ambient air through the air intake system which is compressed and delivered through a charge air cooler to the throttle body.

The air intake to the VGT receives air from the Exhaust Gas Recirculation (EGR) system. For additional information, refer to: ENGINE EMISSION CONTROL

By turbocharging the engine, the pressure and density of the air entering the cylinders is increased and therefore so is the amount of oxygen. This enables a greater quantity of fuel to be injected, thus increasing the engine's power output and the ability to maintain power at higher altitudes.

The internal components are oil cooled. Engine oil is circulated through the bearing housing which acts as a heat barrier between the "hot" turbine and the "cold" compressor. The bearing is a semi-floating journal bearing type and is lubricated by engine oil. Oil is circulated to the VGT bearing housing and returned to the oil pan through an oil drain to the cylinder block.

The charge air cooler (air to water type) is used to increase the density of air as it flows from the VGT compressor to the intake manifold. Compression of the charge air by the VGT raises the temperature of the air, decreasing the charge air density. Consequently less oxygen is able to enter the cylinders, reducing the engines power. To overcome this, the air is routed through the charge air cooler before it enters the engine. The temperature is reduced by transferring the heat to the vehicle low temperature cooling system. Cooling of the intake air also helps to reduce engine emissions by limiting nitrogen oxides (NOx) production. For additional information, refer to: INTAKE AIR DISTRIBUTION AND FILTERING