AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 194)

Page 194 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
The Air Temp Ign Trim table is used to trim the ignition timing vs inlet air temperature. Often
used on boosted applications as a safety mode. Ignition timing is reduced at very high air
temperature readings to avoid detonation. Note that the trim values in this table are added
(positive values) or subtracted (negative values) from the base ignition timing.
The Coolant Ign Trim table is used to trim the ignition timing vs coolant temperature.
Sometimes used on N/A applications with very large camshafts to help with warmup. A few