Nitrous Express Maximizer 4 - Manual (Page 3)

2. MAX-4 hardware installation
The MAX-4 is designed to be installed almost anywhere on the vehicle. Select a location that is away
from heat sources that can damage the wires. Mounting in a dry location is also recommended so
that the USB connections to not corrode.
The MAX-4 controls the nitrous and fuel solenoids by varying the pulse width to the ground wires
of the solenoids. Before wiring the MAX-4 you must decide if you want to use the AFR Closed Loop
Correction feature or not (the solenoid wiring is different for each configuration).
If using the AFR Correction Closed Loop configuration, connect the ground wires of the nitrous
solenoid(s) to the 12awg blue wire of the MAX-4. Connect the ground wire(s) of the fuel solenoids
to the 12awg red wire(s) of the MAX-4. When in ARF Correction Closed Loop mode, the nitrous
controller will only control one stage of nitrous. Furthermore, when the AFR Correction Closed
Loop stage is selected in the software, stage 1 and stage 2 may not be selected.
If you do not plan to use the AFR Correction Closed Loop configuration, you should connect the
ground wires of the nitrous and fuel solenoids for stage 1 to the 12awg blue wire of the MAX-4. If
using stage 2 connect the ground wires of the nitrous and fuel solenoids for stage 2 to the 12awg
red wire of the MAX-4. When using this wiring strategy it is imperative that you select either stage 1
or stage 2 in the MAX-4 software. Do not select the AFR Closed Loop Correction stage in the
software when wired for this configuration.
Controller Ground (dual black 12awg) should be connected to chassis ground as close as possible
to the battery.
Power Input (red 20awg) should be connected to the arming switch and fused for 5 amps
RPM Input (grey 20awg) is designed to work with most Tachometer signals (down to 3 Volts),
without the need for a separate adapter. It can be connected to a tach signal, coil trigger signal, or
fuel injector. DO NOT connect it to a high voltage wire.
Throttle Input (blue 20awg) is designed to work with most throttle-position-sensors (TPS) and
wide open throttle (WOT) switches. Connect it directly to the signal wire from your TPS. For use
with a WOT switch we recommend connecting the blue wire of the MAX-4 to one terminal of the
WOT switch and connecting the other terminal of the WOT switch to the positive 12v output of your
master arming switch.
VSS (Vehicle Speed Sensor) Input (white 20awg) is designed to read most factory VSS signals as
well as pulses from a magnetic driveshaft sensor or a magnetic speedometer cable sensor.
Input #2 (T-Brake Input) (brown 20awg) requires a 12-volt positive signal to activate it. (see
Input #2 in the software section) Example: use this input as a secondary arm switch for
applications that use a trans-brake.
Stage 1 retard output (pink 20awg) provides a signal to trigger the timing retard function of an
ignition box or an external timing retard device.
Stage 2 retard output (tan 20awg) provides a signal to trigger the timing retard function of an
ignition box or an external timing retard device.
MAP (Manifold Absolute Pressure) AKA Boost input (yellow 20awg) Connect this wire to your
MAP sensor signal.
Sensor + 5v (orange 20awg) this wire is used to power an optional MAP sensor
Sensor Ground (black 18awg) this wire is used to ground an optional MAP sensor