Fuel Supply, High-Pressure Side - DFI

Fuel Supply, High-Pressure Side

Direct Fuel Injection (DFI)

The high-pressure fuel system (from the high-pressure pump to the injectors) is comparable with that of the Cayenne 8-cylinder DFI engines.







The picture shows the 3-piston high-pressure pump of the Panamera S

The direct fuel injection is optimally matched to the characteristics of the V8 naturally aspirated engine and V8 bi-turbo engine. An axial piston pump is used in both engines. This is driven by the left intake camshaft. In the V8 naturally aspirated engine, the fuel high pressure is built by up 3 pistons. In the V8 bi-turbo engine, this is done by 6 pistons. Fuel is distributed in both engines via a central high-pressure fuel rail in the inner-V of the engine with separate lines leading to the fuel injectors. When the engine is running, the high pressure measured by the pressure sensor is regulated to a pressure of between approx. 580 and 1740 psi (40 and 120 bar) by the quantity control valve (at the input of the high-pressure pump).