Direct Fuel Injection 911 Carrera

With millisecond accuracy, DFI injects fuel at a pressure of up to 1740 psi directly into the combustion chamber by means of electromagnetically actuated injection valves.
The spray and cone angles have been optimized for torque, power output, fuel consumption and emissions by enabling a homogeneous distribution of the air/fuel mixture, and, therefore, effective combustion. With direct injection, the EMS SDI 3.1 engine control regulates injection timing individually for each cylinder as well as the injection rate for each cylinder bank. This optimizes the combustion process and fuel economy. A hot-film air mass meter takes care of the airflow, so that the combustion chambers contain exactly the right mixture at all times.
DFI improves the internal cooling of the combustion chamber by having the mixture prepared directly in the cylinder. This allows for a higher compression ratio (12.5:1) which helps to deliver more output along with enhanced engine efficiency. It has therefore been possible to reduce CO2 emissions by up to 15%, depending on the model.