Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI System Hardware & BigComm Software - Manual (Page 77)

BigStuff3 Pro SEFI System
Version 2.1 – February 2011 70
To configure engine starting fuel, go to Starting on the Tool Bar. Left click on “Starting” and a drop
down screen will open. Keep the left mouse button depressed and slide the mouse pointer down until
the desired “Starting” fuel drop down is highlighted.
The sequence of events the ECU steps through during an engine “start” are defined, in order, in the
next four sections as follows:
 Cranking
 After Start Delay
 After Start Correction (adding fuel)
 After Start Decay
35. Cranking (F1 – “Quick Key”)
The inputs in this table are only used by the ECU when the engine is in the cranking mode (< 400
RPM).
The Cranking table allows the user to input the actual pulse width the injectors will operate at during
engine cranking. The pulse width required is a function of the engine coolant temperature. The colder
the engine the larger the pulse width required.
If the throttle needs to be opened to start the engine during Cranking, the ECU is adding too much
fuel. Therefore, a smaller injector pulse width needs to be entered into the input cell relative to the
engine coolant temperature. Make sure pulse width modifications are inputted into the correct input
cells. Entering a smaller pulse width into the cell representing an engine coolant temperature of 144
o
will not help start the engine when the temperature is 55
o
.
Note: If the throttle is opened to position greater than what was set in the Clear Flood TPS % setting,
the ECU will not add fuel. See
Clear_Flood_Setting for more details.
While the engine is cranking, a “real-time Ellipse” will move within the Cranking table relative to the
current engine coolant temperature “operating point”. Use it as a point of reference to help calibrate
the Cranking table.