Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI System Hardware & BigComm Software User Manual
Page 57
BigStuff3 Pro SEFI System
Version 2.1 – February 2011
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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.
“Scaled” RPM inputs from this table define the RPM break points used in the following tables,
to name a few, which are described later in this manual!!!
Dwell Time Table
Injector Phase Angle (degree) Table
Boost Spark (retard) Table
Starting Line Timing Table
Y-Axis
X-Axis
Cell Number 16
Cell 1
Scaled RPM Axis
(X- Axis)
Scaled Load Axis (Y-Axis)