Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI (LS1) System Hardware & BigComm Software User Manual
Page 41
BigStuff3 Pro SEFI System (LS1)
Version 1.0
40
This feature allows the user to configure the X axis (RPM) and Y Axis (Load), so that a majority
of the available16 cell by 16 cell fuel and spark map area is available for calibrating. Systems
with fixed X & Y axes allow only a small portion of the available map area to be used to
calibrate the fuel and spark needs of the engine.
This capability is extremely important if the engine is fuel or spark sensitive at a given load
and/or RPM. For example, if the engine/transmission/rear gear combination makes the engine
sensitive to throttle changes at 2,200 rpm, the user can configure the X-axis in 200 or 300-RPM
increments at or around 2,200 RPM.
If the “Speed Density” control algorithm was selected during the aforementioned Hardware
Configuration step, the screen should show MAP (kPa) in the Y axis and RPM in the X axes. If
the screen shows TPS % and the preferred control algorithm is “Speed Density,” go back to
and select Seed Density instead of Alpha N.