Boost Pressure Control

Boost Pressure Control







The above graph shows the boost pressure curve for the 911 Turbo DFI engine at full throttle.

The boost pressure is detected by the boost-pressure sensor upstream of the electronic throttle. The intake air temperature is detected by the pressure sensor for the engine load on the right intake manifold. The DME control unit regulates the boost pressure by activating the servo motors on the VTG turbochargers. The boost pressure is therefore regulated to the boost pressure setpoint calculated in the DME control unit upstream of the electronic throttle.

In the 911 Turbo DFI, it has been possible to reduce the maximum boost pressure in the mid-rev range by approx. 0.2 bar to approx. 0.8 bar through, for example, increasing the displacement, direct fuel injection (DFI), new charge air coolers and other efficiency-improving measures, despite the higher torque values. With the overboost function and an increase in the boost pressure of approx. 0.2 bar, the maximum boost pressure in the mid-rev range is now approx. 1.0 bar (1.2 bar in the previous model). The boost pressure is shown in the instrument cluster.

The overboost function introduced in the previous model in combination with the Sport Chrono Package Turbo option is also offered for the new 911 Turbo. With an activated SPORT or SPORT PLUS button (in combination with PDK) and a fully depressed accelerator, the boost pressure is also raised by approx. 0.2 bar in the mid-rev range of the new 911 Turbo. This function, which as in the previous model is limited to approx. 10 seconds, increases the maximum torque of the new 911 Turbo by 50 Nm to 700 Nm (previous model: 680 Nm).