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A saturated fuel injector is also known as a High Impedance (or High z) fuel injector. The high z injector has a larger ohm draw through the coil (12v-15v) vs. a peak-hold (Low Impedance, Low z) injector, which is 2v-4v. Another difference is the how the injector uses the voltage to open the injector. A high z injector uses the full voltage to open and hold open the injector, therefore it voltage saturated. A low z injector (peak-hold) has a peak of high voltage to open then injector then uses a lower voltage to keep the injector open for the remainder of it's cycle.
What this means to you, the low z injectors typically needs a resistor in line to add the necessary resistance to properly drive the system, otherwise the injectors could overheat to fatigue. A high z injector does not need a resistor.
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