Fueling parameters configuration, Fuel pump configuration, Drivetrain configuration – Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI (LS1) System Hardware & BigComm Software User Manual
Page 35: Pickup wheels, Drive shaft configuration (pulse/rev), Drivetrain_configuration, Fueling_parameters_configuration, Fan_control_configuration, Pickup_wheels, Fuel_pump_configuration
BigStuff3 Pro SEFI System (LS1)
Version 1.0
34
RPM inputs, so that the engine has a small band (hysteresis) between the rev limiter on and off
limits.
Note: The engine may not run if there is no band between the On and Off limits or the
RPM inputs are reversed! For example, if the “Rev Limit On” is set for 7,100 RPM and the
“Rev Limit Off” is set at 7,300 RPM the engine will not run.
2-Step RPM
When 12 Volts is applied to Main Header Connector pin B2, the ECU will begin rev limiting the
engine to the 2-Step RPM setting in the Operating Parameters Configuration input window.
Fueling Parameters Configuration
This screen requires the user to input the fuel injector flow rate and the engine displacement (in
cubic inches!). The user needs to know these inputs (contact your dealer for further assistance).
If the injector flow rate, in pounds per hour (lbs./hr.) is known, the flow rate in cubic
centimeters/minute (cc/min.) can be calculated by multiplying the lbs/hr rate by 10.
Return_to_Fueling_Parameters_Setup
Engine Cooling Fan Control Configuration
This input screen allows the user to set the coolant temperature that the GEN3 ECU will turn the
engine-cooling fan on (Fan On Temp) and off (Fan Off Temp). The Fan Off temperature should
be ~ 5
o
to 10
o
less then the Fan On temperature.
Fuel Pump Configuration
This input screen allows the user to set the amount of time the fuel pump will run when the
ignition is turned to the “On” position. This allows the user time to prime the fuel pump and
check for leaks before the engine is started. A time period of up to 25 seconds can be inputted
into this screen.
Drivetrain Configuration
The vehicle final drive ratio and tire diameter inputs are required to enable the ECU to make the
correct Mile-Per-Hour (MPH) calculations.
Pickup Wheels
Drive Shaft Configuration (Pulse/rev)
This input screen allows the user to set the quantity of teeth on the transmission output shaft.
This input is part of the MPH calculation made by the ECU. For reference, the GM 4L60E and
4L80E transmissions have 40 teeth tone rings on their output shafts.