Cars · Electronics
Low Impedance Injectors
Low-impedance (peak-and-hold) injectors and where they are used.
Low-impedance injectors, also called peak-and-hold injectors, have a low coil resistance (roughly 2 to 4 ohms). They open quickly and are common on very large, high-flow injectors. Because of that low resistance they should not be run directly on a plain saturated driver for long, or the driver and injector can overheat.
They need either a peak-and-hold driver (which hits the injector with a high opening current and then drops to a lower holding current) or a resistor pack in series to limit current when run on a saturated driver. Stock Honda setups use high-impedance injectors, so switching to low-impedance usually means adding a resistor box or a suitable standalone driver.