Thread: low z vs high z
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Old 06-12-2007, 09:42 AM
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Default Re: low z vs high z

High Impedence and Low Impedence refers to the resistance of the electromagnetic coil in the injector.

Low Z = 2 - 4 ohms
High Z = 12 - 15 ohms

A Low Z injector is designed to be fired with a "Peak and Hold" driver ... i.e. a very brief high current pulse "yanks" the injector open and then it's held open by a lower steady current. This requires a VERY beefy injector driver and a injector coil capable of high current.

A High Z injector is by far the most common type and is designed to be fired with a "Saturated" driver. The driver sends a constant current to the injector to open and hold the pintle/disc. These drivers use a lot less current and typically the injectors are cheaper since they don't need a high current coil.

The "hybrid" injectors, such as the Mototron 60-65# injectors use a coil that can be driven by EITHER peak & hold or saturated drivers. This allows them to be used by either an OEM style ECU or an aftermarket/racing ECU.
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