AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 172)

Page 172 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
Individual cylinder trims are used to compensate for uneven air distribution. Each injector
output has an associated trim table. The Injector 1 Trim table is used for the EMS injector #1
output. The X-axis of the table is engine RPM. Proper instrumentation is usually necessary to
take full advantage of these tables. Either individual cylinder EGT data or individual cylinder
AFR data is required.
If EGT data is used, note that it is sometimes difficult to know what side of “peak EGT” the
engine is running on. Additional instrumentation is sometimes necessary to confirm the EGT
data. See below for more information: