Turbocharger - Overview: Overview

The TC assembly consists of the LH and the RH turbochargers. The TC is an exhaust-driven centrifugal air compressor used to increase power output by supplying compressed air to the engine. The internal components are oil, coolant and air cooled. Engine oil and coolant are circulated through the center housing which acts as a heat barrier between the hot TC turbine and the cold TC compressor. The TC bearings are sleeve type and lubricated by engine oil. Oil is circulated to the TC center housing and returned to the engine oil sump through an oil drain in the TC center housing.

The expanding exhaust gases drive the TC turbine shaft assembly to speeds up to 200, 000 rpm. Filtered air entering the compressor side of the TC is compressed and delivered through the CAC. The very hot compressed air is cooled by the CAC, then continues on to fill the intake manifold at a higher pressure than atmospheric pressure. Because 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 EcoBoost™ twin turbochargers are used in a parallel arrangement with one TC connected to each cylinder bank. This configuration improves engine responsiveness due to the reduced inertia of 2 small turbochargers. This also leads to an improved TC package and better utilization of heat energy from the compact exhaust manifolds. The compact design of the system allows the catalysts to be located very close to the TC outlet for improved emissions.