Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI (LS1) System Hardware & BigComm Software - Manual (Page 71)

BigStuff3 Pro SEFI System (LS1)
Version 1.0 70
41. Desired Idle RPM
The Desired Idle Rpm table allows the user to set the desired engine RPM as a function of
coolant temperature. To configure the table, input the desired engine RPM for the each
temperature shown at the bottom of the table. The ECU controls the idle speed so transitions
between temperature ranges are not noticeable.
Note: The TPS needs to be set properly for this input to function properly. See
TPS_Configuration for further assistance.
While the engine is running, a “real-time Ellipse” will move within the Desired Idle Rpm
Table relative to the current engine coolant temperature “operating point”. Use it as a point of
reference to help calibrate the Desired Idle Rpm table.
To change a value in the Desired Idle Rpm table, move the cursor using the PC’s mouse or
arrow keys to the cell to be changed. Input the desired value and hit “Enter” to save the change.
.
42. Idle Spark
The Idle Spark control function helps maintain idle quality by introducing bi-directional spark
timing as an additional control variable.
Note: This control strategy is only invoked when the throttle position is below the Max TPS for
Idle. See
TPS_Configuration !
The fixed values, below the table, are the ECU’s reference points for how many RPM the engine
is operating at above or below the “Desired RPM.” The fixed values define the active control
(RPM) range. The active range is from 256 RPM below the “Desired” RPM to 224 RPM above
the “Desired” RPM.