seems weird even titaniumdave run saturated injectors with resistor box without any problem. Aem ems must be control it somehow. I don't know anything about tuning so can some tuner explain this.
I *am* a tuner and very familiar with the AEM (all other systems). The injectors fire, but it is certainly not ideal. The impedance per driver is far too high (ohms).
A high impedance driver has an internal resistance of 12.5ohms. A low impedance driver is around 2.5ohms.
The idea of the resistor box is to bring the resistance of a low-imp. driver to 12.5-14.0ohms.
So basically, you are running a driver already at 12.5ohms, and then increasing the resistance (lowering the voltage) with the resistor box.
The high impedance driver will not have enough current to "slam" open fast enough (response time), and dwell voltage to maintain the open time (duty cycle). The high-imp injector is designed to work on a single voltage value for "open" and "dwell".
A low-imp. injector is called "peak and hold" because, it uses a higher voltage (peak voltage) to "slam open" the solenoid (response time), then a lower voltage to keep the solenoid open during the dwell (hold) time.
Again, although it "may" have worked, it is certainly NOT the way to do it.
The AEM EMS will not "bypass" the resistor box in any way, not does it have a "setting" to use a resistor box with high-impedance injectors.
It (resistor box) *must* be removed if you're using high-imp injectors.