Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI (LS1) System Hardware & BigComm Software - Manual (Page 48)

BigStuff3 Pro SEFI System (LS1)
Version 1.0 47
24. AIR FUEL RATIO (F11 – (“Quick Key”)
25. Air Fuel Ratio Table
Note: In most 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.