AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 164)

Page 164 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
A 100% trim will effectively double the fuel flow. The Main Fuel Map can then be
configured to maintain the same target pulsewidth vs engine pressure. It will only vary
vs engine RPM as shown below:
100% more fuel needed
here than at 100 kpa to
compensate for the
additional “atmosphere”
worth of manifold
pressure.