It is an important performance characteristic giving an indication of the condition of the inner workings of the injector. To give an idea of the typical values you can expect, there is a distinct difference between injectors actuated by a solenoid valve and those actuated by piezo stack; piezo injectors have faster response times, typically 200 – 350μs, whereas for coil injectors the values can range between 350 – 700μs depending on manufacturer, injector design and vehicle application. Additionally, later generations of injector design have produced incremental improvements.
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