MAPECU Low Impedance Injector Driver
The MAPECU Dual Channel Low Impedance Injector Driver drives low impedance fuel injectors from ECU’s designed to drive high impendence saturation injectors. The MAPECU3 and MAPECU2 have up to three (3) high current outputs that can be configured to drive up to six (6) high impedance saturation auxiliary injectors. The Low Impedance Injector Driver allows the MAPECU3 or MAPECU2 to drive as many low impendence injectors as required using a single Switched Output. The MAPECU Dual Channel Low Impedance Injector Driver is a true 4:1 Peak Hold driver with 4A Peak current to open the injector and 1A during the Hold period, all in a small 60mm x 43mm x 32mm package. If battery voltage is low and 4A is not possible, the driver will drop the peak current after 3.9mS to prevent fuel injector overheating. The Low Impedance Injector Driver can also be used to convert OEM ECU’s designed to drive high impedance injectors to low impedance injectors.
Note: The above example illustrates the Low Impedance Injector Driver connected to the MAPECU3 or MAPECU2 Switched Output #1 configured as “INJ” using MAPCAL.
Note: Two Ground wires are provided due to the high currents involved with low impedance injectors. Both Ground wires should be connected to the OEM Injector Ground point
Low impedance injectors get their name from their resistance, which is generally less than 4 ohms. A low impedance injector driver is required to alter the current through the injector and prevent the injector coil burning out. A low impedance injector creates a much stronger magnetic field opening the injector faster. This high current would burn out the injector if used for the entire injector opening time therefore the low impedance injector driver drops this current to a “hold” current after the has opened. This is why this type of driver is also called a Peak Hold driver. Peak current opens the injector and Hold current keeps it open. A low impedance injector driver is far superior to ballast resistors sometimes used with low impedance injectors.