AEM 30-71XX Infinity EMS Quick Start Guide - Manual (Page 41)

Tuning Guide 39
© 2014 AEM Performance Electronics
Modified Values
Calibration table changes that haven't been committed to flash memory are highlighted as shown
below. Conditions that will reset the display are as follows:
1. Manually committing changes through the Target > Commit modifications menu command
2. Manually committing changes using the hot key combination [Ctrl Shift C]
3. Opening and closing the Setup Wizard. Note the Setup Wizard automatically commits ALL
changes to memory every time it is closed.
4. Turning the ignition switch off when the tuning preference Key Off Commit is selected
VE & Airflow Based Tuning
The Infinity ECU uses significantly different methods of calculating the fuel delivery requirements
and outputs than previous AEM products.
Measured data from sensors, i.e., Manifold Absolute Pressure (MAP [kPa]), Air Temperature,
Coolant Temperature, and Engine RPM, are acquired. The ECU uses this sensor data in
combination with Volumetric Efficiency (VE%) to estimate airflow.
The Volumetric Efficiency is a percentage of air and fuel that actually enters the cylinder during
induction relative to the volumetric capacity (rated displacement) of the cylinder under static
conditions. The VE lookup table is a 2-axis lookup table, with load values (typically MAP [kPa])
versus Engine RPM. In each table cell, the Engine RPM corresponds with a specific MAP [kPa],
and a Volumetric Efficiency is defined for that cell.