Hardware & BigComm Software Instruction Manual

BigStuff3 Pro SEFI System

Version 2.1 – February 2011 50

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

Main_Configuration

and select Seed Density instead of Alpha N.

“Scaled” RPM inputs from this table define the RPM break points used in the follow

ing 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

ll 1

Scaled RPM Axis

(X- Axis)

Scaled Load Axis (Y-Axis)