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Direct fuel injection (DFI)

The Cayman S
Porsche The Cayman S - Direct fuel injection (DFI)

Direct fuel injection (DFI)


With direct injection, the engine management system regulates injection timing individually for each cylinder as well as the injection rate for each cylinder bank. This optimises the combustion process and therefore fuel economy.

Depending on the engine operating condition, multiple fuel injections take place so that the catalytic converter reaches normal operating temperature sooner after a cold start and a greater top-end torque can be achieved.

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, which helps to deliver greater power output at the same time as enhanced engine efficiency. Injection is regulated by the electronic engine management system and emissions are monitored by the stereo Lambda sensors, thus helping to protect the environment.