AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 113)

Page 113 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
Coil dwell is configured in the EMS calibration using the following options and tables:
Ignition Charge Time (ms) = (Dwell vs Battery V value) * (Dwell vs RPM value)
Example: Calibration contains the following values:
Dwell vs Battery V = 3.0 ms (at 13V)
Dwell vs RPM = 100% (most RPM)
Charge Time = 3.0 * 100% = 3.0 ms
The Dwell Min and Dwell Max options are used to define the minimum and maximum allowed
dwell time in units of teeth. The actual time in milliseconds that these values represent will
depend on the timing pattern configuration and the engine RPM.
WARNING! INCORECT IGNITION DWELL SETTINGS CAN LEAD TO COIL OVERHEATING
AND A POTENTIAL FIRE HAZARD. CONTACT YOUR IGNITION COIL MANUFACTURER
FOR RECOMMENDED DWELL SETTINGS.