Taking the direct route means not compromising. The same applies to our latest generation of sportscars. They offer impressive power and prove that even highperformance cars can achieve moderate fuel consumption and emission values. Thanks to new direct fuel injection (DFI).
This technology has been used in the new Panamera. It has already proved its value in the Cayenne – with its 8-cylinder engine, and even bi-turbocharging, it drives like a Porsche should. With simultaneously improved fuel economy and reduced emissions.
It has proved equally effective with the 6-cylinder Boxer engines. In the 911 models, for example, DFI reduces fuel consumption by up to 13 % and CO2 emissions by up to 15 %.* In the Boxster and Cayman S-models, depending on the type of transmission, the figures are up to 15 % reduced fuel consumption and up to 16 % reduced CO2 emissions.
At the heart of the system lies an injector which sits directly on the cylinder head and injects fuel directly into each combustion chamber with the help of a highpressure pump at a pressure of up to 120 bar. This disperses the air/fuel mixture more precisely, increasing the mixing of air and fuel.
Because direct injection reduces cylinder temperature, more air than normal can be compressed into the combustion chambers. This increases the energy density of the mixture and hence leads to fuel saving. It is possible to control the required fuel volume exactly via the duration and pressure of injection.
Direct fuel injection is also used in the new Cayenne Diesel with a common rail injection system. The result: greater efficiency and increased power.
DFI can do even more than that, however. When starting the engine, for example, some combustion takes place in the exhaust manifold which helps the catalytic converter to warm up faster. This lowers exhaust emissions.
* The fuel consumption saving given is determined from the figures in the NEDC (New European Driving Cycle). For model year 07 to Euro 4 (80/1268/EEC), for model year 08 to Euro 5 (715/2007/EC and 692/2008/EC). The figures do not relate to an individual vehicle but are intended solely as a means of comparing different vehicle types.
Fuel consumption/emissions*** of the Porsche models: Urban in l/100 km -; Extra urban in l/100 km -; Combined in l/100 km -; CO2 emissions in g/km -.
** В сочетании с 19-дюймовыми всесезонными шинами (оптимизированными по сопротивлению качению).
*** Данные определены методом измерений Евро-5 (715/2007/ЕС и 692/2008/ЕС) в цикле NEFZ (новый европейский ездовой цикл). Сведения не относятся к отдельному автомобилю и не являются частью предложения, а служат только для сравнения различных типов автомобилей. Дополнительную актуальную информацию по отдельным автомобилям Вы получите в Вашем центре/у дилера Porsche.