Manual

Page 176 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
Fuel Trim 1 – The trim % taken from the Injector 1 Trim table (individual cylinder trims). Other
cylinders work the same way.
Fuel Inj 1 Pulse – The actual commanded pulsewidth for the injector #1 output after all trims
have been applied.
Additional Function Based Fuel Trims
Nitrous Control – Option to turn the Nitrous control function on/off. Fuel trim will be applied
according to the values in the N2O Fuel map. See section on the Nitrous Control function for
more information.
O2 FB Control – Option to turn the O2 Feedback Control function on/off. O2 feedback fuel trim
will be applied according to the settings in the O2 Feedback Function setup.
VTEC Fuel Trim – Option that defines the fuel trim % when the VTEC function is active.
Knock Fuel Add Max – Option that defines the max knock fuel trim when knock function is
active.
TC Fuel Cut – Option that defines the % fuel cut applied when the Traction Control function is
active.
Alt Fuel Trim – Option that defines the % fuel trim applied when the Alt Function is active.
Acceleration/Deceleration Modifiers for Engine Fueling
When the throttle is rapidly opened or closed the demand for fuel increases or decreases. If at
a low-throttle-angle, steady-state running condition the throttle is opened rapidly, manifold
pressure increases. In this situation, the sudden demand for air (hence power) requires a
temporary enrichment of the mixture to maintain a reasonable AFR. Because the rapid opening