Main configuration table, Main_configuration – Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI (LS1) System Hardware & BigComm Software User Manual
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BigStuff3 Pro SEFI System (LS1)
Version 1.0
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Main Configuration Table
The Hardware Configuration’s Main Configuration table is relatively self-explanatory. Working
from the top of the table, select the parameters shown in the screen print above as follows:
• Select the number of cylinders the engine has.
• Select whether system will operate using a speed density (engine speed and engine load)
or Alpha N (throttle angle and engine speed) algorithm. The majority of the engine
applications use the Speed-Density control algorithm. If the camshaft duration exceeds
260
0
• Select the fuel feed back control configuration. If the engine will not use oxygen (O2)
sensor feedback control, select “Open Loop”. If the engine will use oxygen sensor
feedback, select “Closed Loop”. Note: Air fuel ratio can still be recorded in “Open
Loop” mode.
at .050” lift, the Alpha N control algorithm should be considered.
• Select the type of Throttle Position Sensor (TPS) being used (to output throttle angle to
the ECU). The TPS is located on the side of the throttle body, at the end of the throttle
shaft. GM style TPS sensors have a .5V to 4.5V output. Ford style TPS sensors have a
.9V to 4.5V output. If the sensor type being used is not clear, a dealer should be
contacted before attempting to start and calibrate the engine.
• Lastly, select the Manifold Absolute Pressure (MAP) sensor setting for the application.
For normally aspirated engines, the 1 BAR MAP sensor setting should be selected. For
blown or turbocharged applications a 2 BAR MAP sensor setting must be selected (for
boost pressures up to 15 PSI). For boost pressures up to 30 PSI, the 3 BAR MAP sensor
setting should be selected. For boost pressures up to 52 PSI, the 4 BAR MAP sensor
•
•
• setting should be selected. For boost pressures up to 60 PSI (gage) the 5 BAR MAP
sensor setting should be selected. Contact your dealer to make your system was supplied
with the correct MAP sensor.