Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI (LS1) System Hardware & BigComm Software - Manual (Page 45)

BigStuff3 Pro SEFI System (LS1)
Version 1.0 44
The purpose of this table is to allow the user to configure the ECU to maintain a constant injector
flow rate with varying battery voltages.
Fuel injectors have a minimum pulse width (in milliseconds) required before they will open and
let fuel flow. For example, with a constant battery voltage of 13.4V, a 60 lb/hr. Bosch injector is
not likely to open until the ECU sends a pulse width command of 1.4 to 1.5 milliseconds
(injector opening time is also influenced by fuel pressure).
At a given voltage, the minimum pulse width required to open an injector will vary based on
injector size, injector type and manufacturer. This input screen allows the user the ability to fine
tune flow rates (injector opening time) based on battery voltage.
23. Injector Phase Angle
Injector Phase Angle setting allows the ECU to “time” the fuel delivery relative to the intake
valve opening!
To calculate the actual Start of Injection (SOI) use the following equation:
360
o
- (minus) LS1 “Crank Reference” + (plus) “Phase Angle”. The
360
- 350
o
o
See LS1 Crank_Reference_Setup accessed from Operating Configuration table.
10
o
+290
o
Input from Injector Phase table. Accessed from Configuration drop down.
300
o
The major benefit of this feature is realized when using high flow injectors with a smaller duty
cycle.