AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 132)

Page 132 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
vary based upon the MAP sensor used in the system. The load value of 0 displayed in AEM
Tuner is determined by this setting.
Map Max Volts - This is the value of the MAP signal in volts that corresponds with the
maximum map value. This number represents high manifold pressure (full throttle on a naturally
aspirated engine or boost on a forced induction engine). This number varies based upon the
MAP sensor used in the system. The maximum load value displayed in AEM Tuner is
determined by this setting.
Load Offset - Offset used to scale engine load input away from the base 0-100% setting. Full
Load scale = 100 * Load Scalar + Load Offset. All load scales calculated here must be in kPa if
you are using load units for the user selectable units to function.
Load Scalar - Scaler used to scale engine load input away from the base 0-100% setting. Full
Load scale = 100 * Load Scalar + Load Offset. All load scales calculated here must be in kPa if
you are using load units for the user selectable units to function.
Map Filter - How many teeth pass to average the MAP sensor. A larger number filters the MAP
sensor more.
Speed Density - This is the switch to use a MAP sensor as the primary load input with the
system. If neither this nor the MAF option is selected, the load input will default to the Throttle
position sensor.
Map Sensor Wizard
The setup wizard in AEM Tuner contains calibration settings for several different MAP sensors.