AEM 30-3020M Water Methanol Failsafe Device - Manual (Page 2)

Page 2
INSTALLATION DIAGRAM
OVERVIEW
Water/methanol injection is used to lower air charge temps and reduce detonation which allows for aggressive tuning to
be utilized while using a low octane base fuel. When relying heavily on water/methanol injection a safety device is
strongly recommended in order to prevent detonation and possible engine damage in the event of a leak or clog.
Progressive injection systems have a dynamic flow output and monitoring both the injection flow rate and the injection
percentage means a high level of engine protection can be achieved.
The AEM Water/Methanol Failsafe is an advanced safety device that allows the end user to closely monitor the
performance of their water/methanol injection system. Water/Methanol Failsafe collects flow versus injection percentage
data points and plots them in a graph to create an injection flow curve using PC configuration software. “Injection
percentage” is a calculated value that is indicative of injection pump or injection valve duty cycle and is based on a scale
of 0-100 percent.
Once a baseline flow curve is established, the end user can then assign high and low flow threshold lines that can be
contoured to closely follow the baseline flow curve. If injection data points occur outside of the high and low flow
threshold lines, an alarm condition will be triggered. Injection data points that occur in the area between the high and low
flow threshold lines are considered acceptable and an alarm condition will not be triggered.
Once an alarm condition is triggered, two outputs will activate along with a visual alarm alert. The Water/Methanol
Failsafe has one high side or +12 volt output and one low side or ground output. Both outputs can be configured to turn
on or off when an alarm condition is triggered. These outputs can be used to turn off a boost controller, retard ignition
timing, switch fuel and timing maps, activate a warning light or buzzer, or deactivate another external system (nitrous,
etc.). The gauge backlighting and needle can also be set to flash to notify the vehicle operator of an alarm condition.