DUTY

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This is the injector duty cycle. 100% means the injector is fully open (it never closed) and cannot deliver any more fuel. The injector duration usually reaches it's maximum near peak power. Normally it best to upgrade the injectors and/or the fuel system once the duty cycle reaches 80-85%

 

Remember that different driving conditions may place further demands on the fuel system from when the engine was tested. e.g. colder weather will require more fuel from the injectors.