AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual User Manual
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Tuning Guide
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© 2014 AEM Performance Electronics
ShiftSwitch
Units: Voltage conditions for Switch On / Off
Description: This table allows the tuner to define which voltages represent the switch 'ON'
position and which voltages represent the switch 'OFF' position. For instance, the example below
would be useful for a strain gauge installed on the shift lever of an H-pattern gearbox. The resting
voltage may be between 2.0 - 3.0V. When the shift lever is pressed forward, the strain gauge
voltage go be below 1.99V, so we set the table to '1' because we want to trigger a ShiftCut
event. When the shift lever is pulled back, the strain gauge voltage will go above 3.01V, so we
set the table to '1' because we want to trigger a ShiftCut event. Please note the shift cut event will
only be triggered if all other conditions including RPM and throttle position are met, see the
section of the wizard for further description of the other conditions.
Shift Cut Time
Units: mS vs Gear
Description: If all the conditions for shift cut are met, the Infinity ECU will cut fuel or spark and
retard ignition timing for this amount of time once the ShiftSwitch turns on. The cut time depends
on which gear the transmission is currently in. A typical conservative value is 300mS.
The datalog below shows a vehicle with a sequential gearbox shifting from 4th gear to 5th gear
without lifting the throttle. On this vehicle, an on/off switch was installed on the shift lever so the
switch sends ground when the lever is pulled to up-shift.
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