Edit - Holley MPI PRO-JECTION Installation Tuning And Troubleshooting Manual

14.4.2 Edit

If "Edit" is chosen, the following pull down menu will appear revealing the following commands on the PC screen:
1 - Injection Volume - Use this selection to modify the loaded map Injection Volume. There are 256 fuel map points that can
be modified. Move the highlighted cursor to the area you wish to modify and type in the new
injection volume value. Do not enter "0" for any value on this map.
2 - Oxy Trigger Voltage - Use this selection to modify the loaded maps Oxygen Trigger Voltage. The Trigger Voltage will
determine the air/fuel ratio your engine operates at. The 5 regions that can be adjusted are: idle,
low throttle, part throttle, mid throttle and high throttle. A value of 55 is equivalent to 0.55 volts or
a stoichiometric fuel/air mixture. NOTE: The values programmed at Holley allow for a slightly
lean mixture at light cruise, and a slightly rich mixture at higher throttle applications. A maximum
Oxy Trigger Value of 80 or 0.8 volts which corresponds to a slightly rich mixture can be entered
into the map. The Oxygen Trigger Voltage has a relatively minor effect on the fuel/air ratio and
therefore it should not be necessary to change these values. Press "Esc" to exit.
3 - Engine Temp Comp - Use this selection to aid in engine warm-up. This table adds additional fuel to the Injection
Volume map during warm-up to help driveability. If your engine is running rich during warm-up,
decrease the values at the engine temperature (as determined in Data Monitor) at which the
richness occurs. Conversely, if the engine is lean, increase the value. Press "Esc" to exit.
4 - Advanced Setup - Use this selection for the following modifications:
A - RPM scale - To modify the RPM scale, enter the appropriate values under RPM scale, then press "enter".
B - MAP Scale - To modify the MAP scale, enter the appropriate values under MAP scale, then press "enter"
Approximate Air/Fuel ratio at given
oxygen trigger voltage
Oxy Trigger Voltage Air/Fuel Ratio
.8
.75
.70
.65
.6
.55
.5
.35
.2
.15
.1
.05
13.2
13.9
14.1
14.2
14.3
14.35
14.4
14.45
14.5
14.6
14.7
15.7
21