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Home >> BMW >> 2011 >> X5 35i >> Repair and Diagnosis >> Engine Mechanical >> Blowers, Superchargers & Turbochargers >> Functional Description - Engine Performance & Emissions - Except Diesel >> Engine Performance & Emissions, Gasoline Engine - Functional Description >> Air supply - N55 engine >> Brief component description >> Exhaust turbocharger with wastegate valve

Exhaust turbocharger with wastegate valve

The engine features a twin-scroll exhaust turbocharger. As the dynamics in the exhaust manifold increase at low engine speeds, the energy in the exhaust gases is utilized more effectively. This means the maximum torque is reached at engine speeds as low as 1200 RPM. The charging pressure is regulated by the Digital Motor Electronics (DME) via a wastegate valve. The wastegate valve is adjusted pneumatically by a diaphragm box. A pressure converter applies a partial vacuum to the diaphragm box. The exhaust turbocharger has 4 connections for cooling and lubricating the exhaust turbocharger:

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