BMW 3: Exhaust System
BMW 3 Series G20 (2018-2025) Training manual / B46TU-B48TU Engines / Cooling System / Exhaust System
Exhaust turbocharger
Exhaust turbocharger
The exhaust turbocharger can be replaced individually and is exclusively made of steel. The boost charge pressure is still controlled by an electrical wastegate valve.
The Turbo on the B46TU and B48TU are different in design.
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Fuel System
The fuel system is made up of the fuel supply and fuel preparation systems.
The fuel supply includes
the fuel tank with all mounted parts and the fuel lines up to the engine
compartment.
The fuel p
Fuel preparation
The fuel preparation has again been adapted to meet the emission legislation
requirements. The high
pressure pump and the injectors have been revised and designed for an fuel
injection pressure of
3
Fuel high-pressure pump
The single-piston high pressure pump by Bosch, well-known from the B46
engine, is used. The high
pressure pump HDP6 is driven by a triple cam which is attached to the exhaust
camshaft. To be able
to
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Coolant pump
The layout and function of the coolant pump have been revised and adapted to
match the cooling
concept of the B46TU/B48TU engines.
Coolant pump
Pressure relief valve closed (pressure < 2.2 bar / 32 psi)
Pressure relief valve opened (pressure > 2.2 bar /
Connections
The connections at the Electrical Machine Electronics can be divided into
four categories:
Low-voltage connections
High-voltage connections
Connection for potential compensation line
Connections for coolant lines.
Connections of the Electrical Machine Electronics with lines
Connection for
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