Principles of Operation

The turbocharger is an exhaust-driven centrifugal air compressor. Its purpose is to increase power output by supplying compressed air to the engine.

Expanding exhaust gases drive the turbine shaft assembly to speeds up to 200, 000 rpm. Filtered air entering the compressor side of the turbocharger is compressed and delivered through a charge air cooler. The very hot compressed air is cooled by the charge air cooler, then continues on to fill the intake manifold at a higher pressure than atmospheric pressure. Because considerably more air is forced into the intake manifold, the results are increased power, fuel efficiency and the ability to maintain power at higher altitudes.

The turbocharger is governed by a wastegate actuator. The wastegate actuator redirects some of the exhaust gas past the turbine and therefore acts as a governor.

The intake air system is fitted with a turbocharger bypass valve. This vents the intake air system when the throttle is closed and recirculates the air back into the intake air system. It also releases pressure on the turbocharger which will reduce turbo lag and improve acceleration and increase engine performance.

The turbocharger housing is both water and oil cooled. The oil supply also lubricates the turbocharger bearings.

The EcoBoost turbocharger is connected to the cylinder head. This configuration improves engine responsiveness due to the reduced inertia of a small turbocharger. This also leads to an improved turbocharger package and better utilization of heat energy from the compact cylinder head to turbocharger flange. The compact design of the system allows the catalysts to be located very close to the turbocharger outlet for improved emissions.