TOP END MS
01-31-2007, 05:47 PM
Fuel Maps
Below around 80% throttle, the ECU uses the oxygen sensor in conjunction with the fuel tables to calculate how much fuel is needed for your engine. This is called "closed loop" mode because the ECU is in a closed feedback loop using the Oxygen Sensor to steer the Air Fuel Ratio to the desired level. Above the throttle position threshold, the ECU exclusively uses look up tables. The ECU looks through the lookup tables and, depending on engine speed and intake manifold vacuum, selects a length of time that the injectors will stay open. If you are interested in modifying your ECU, chances are that your ECU spends a fair amount of time in the look up table mode (open loop).
I will assume you are looking at an editor like this:
http://www.ef-honda.com/ben/pw0fuel.gif
CLICK HERE TO CONTINUE THIS ARTICLE @ PGMFI.org (http://www.pgmfi.org/twiki/bin/view/Library/UnderstandingMaps)
Below around 80% throttle, the ECU uses the oxygen sensor in conjunction with the fuel tables to calculate how much fuel is needed for your engine. This is called "closed loop" mode because the ECU is in a closed feedback loop using the Oxygen Sensor to steer the Air Fuel Ratio to the desired level. Above the throttle position threshold, the ECU exclusively uses look up tables. The ECU looks through the lookup tables and, depending on engine speed and intake manifold vacuum, selects a length of time that the injectors will stay open. If you are interested in modifying your ECU, chances are that your ECU spends a fair amount of time in the look up table mode (open loop).
I will assume you are looking at an editor like this:
http://www.ef-honda.com/ben/pw0fuel.gif
CLICK HERE TO CONTINUE THIS ARTICLE @ PGMFI.org (http://www.pgmfi.org/twiki/bin/view/Library/UnderstandingMaps)