Porsche 924 Turbo Ignition Timing

924 Turbo Ignition Wiring Diagram

The diagram shows the basic ignition timing curve verses engine speed, without the ignition timing changes which result from input from the pressure sensor and intake air temperature sensor. To make starting easier, the ignition timing is relatively retarded during engine cranking. As the engine starts, the timing is advanced quickly and then retards as the engine approaches idle speed. If the idle speed drops e. g. when switching on electrical equipment or the air conditioner , the timing is...