Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI (LS1) System Hardware & BigComm Software - Manual (Page 93)

BigStuff3 Pro SEFI System (LS1)
Version 1.0 92
How to Use With Stick Shift Cars - For stick shift cars, the ignition timing needs to be retarded
in order for the engine to build boost at the starting line (with the clutch in).
If this feature is used with the 2-Step, make sure that
Boost_Parameters RPM input is set 1,500
RPM below the 2-Step RPM enable point. Once the Boost Parameters TPS and RPM criteria are
satisfied the ECU will use the timing values from the Starting Line Timing table. If the RPM
and TPS criteria are not met, the ECU will default to the timing values in the main spark map.
The values in the main spark map may not allow the engine to build boost, so it is important to
properly configure the relationship between the Boost Parameters RPM and TPS criteria and the
2-Step RPM It takes +12V to activate the 2-Step.
How to Use With Automatic (transmission) Cars – For automatic cars, the ignition timing should
not be retarded. You want to use whatever ignition timing values the engine requires to build
boost and make the car leave hard.
Note: The timing values inputted into the Start Line Timing table are the
absolute values the
ECU will use when the Boost Parameters minimum RPM & TPS are reached! If you enter 0
in the table, there will be no Starting Line timing function.
Boost Connector Pin-out Configuration
Connector Pin Function
A Timer Enable
B Stage 1 / PWM Output
C Stage 2
D Stage 3