Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI System Hardware & BigComm Software - Manual (Page 62)

BigStuff3 Pro SEFI System
Version 2.1 – February 2011 55
24. AIR FUEL RATIO (F11 – (“Quick Key”)
25. Air Fuel Ratio Table
Note: In some cases, the ECU shipped with your system will come pre-configured with a table, which
will closely match your engine configuration. The air fuel ratio table below allows the user to input
desired air/fuel ratios for sixteen (16) engine speed (RPM) and 8 load (MAP or TPS) combinations.
The X-axis represents engine RPM and allows for 16 inputs and the Y-axis represents engine load and
allows for 8 inputs. For each speed and load combination (cell) the engine operates within, the ECU
uses the WBO2 sensor feedback to achieve the desired air/fuel ratio for that cell.
While the engine is running, a “real-time Ellipse” will move throughout the Air Fuel Ratio table
relative to the current RPM & Load “operating point”. Use it as a point of reference to help calibrate
the Air Fuel Ratio table.
To change a cell value in the Air Fuel Ratio table, move the cursor using the PC’s mouse or the arrow
keys to the cell to be changed. Click on the cell and type a desired Air Fuel Ratio value (from to 10.5
to 15.0) and hit
“Enter”
to save the change.
To make changes to multiple cells simultaneously, left mouse click and drag the cursor (down and to
the right) across the cell range to be changed. Release the left mouse button and a secondary drop
down screen will appear outlining three potential “cell fill” options
Use the air/fuel icon to quickly access the
air/fuel ratio table. The F11 “Quick Key”
can also be used.