Intake Air Side, Air Routing

Intake Air Side, Air Routing

Rear Lid

The inner part of the lid has two separate intake ducts which are routed to the air cleaner housing.

Air Cleaner







The air cleaner housing and the air cleaner element were newly developed for the new 911 Turbo. The air cleaner housing was lined inside with foam in order to obtain an optimum intake sound. It was possible to reduce the intake resistance and optimize the charge cycle by way of the 2-channel intake via the rear lid, the new air cleaner element and two separate intake pipes to the turbochargers on the left and right.

In addition, it was also possible to reduce the frequency of cleaner replacement. The air cleaner element now has to be replaced only every 40,000 miles (60,000 km) or after 4 years. The top part of the new air cleaner (housing) has been provided with a design cover made of aluminium to visually upgrade the engine compartment. This cover is embossed with the logo "VARIABLE TURBINE GEOMETRY".

2Hot-film Mass Air Flow Sensors HFM 5-6.4







One hot-film mass air flow sensor HFM 5-6.4 is located in each of the turbocharger intake pipes on the left and right behind the air cleaner. The mass air flow sensors are matched to the overall air mass of the engine. Each of the two mass air flow sensors can measure an air mass of up to 800 kg/h.

Diverter Control







When the throttle is closed quickly (deceleration), the boost pressure increases in the pressure system in front of the throttle because the compressor of the turbocharger continues running. The new 911 Turbo (997) is also equipped with a diverter valve for each cylinder bank to blow off the excess boost pressure. In contrast to the 911 Turbo (996), however, this is not accommodated separately, but is integrated in a space-saving and compact manner in the compressor housing of the turbocharger. The Motronic control unit activates the electro-pneumatic switching valve, which then opens the diverter valve by means of a vacuum.