Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI System Hardware & BigComm Software - Manual (Page 129)

BigStuff3 Pro SEFI System
Version 2.1 – February 2011 121
 Note: A CD ROM disk is no longer supplied with a CD ROM software Disc, but one can be
purchased from BigStuff3.
 Note: BigStuff3 recommends checking all of the settings in the configuration tables to ensure
the system as supplied will operate correctly.
 Note: The air fuel ratio will still be displayed and recorded while in “Open Loop” mode.
 Note: It is important to have the TPS (%) setup correctly. The TPS sensor (on the throttle
body) and software need to be setup properly to ensure that the full resolution (1% to 100%) of
the sensor can be utilized
 Note: Make sure that the correct type of TPS (GM or Ford) is selected during the hardware
configuration process outlined above.
 Note: The engine may not run if there is no band between the On and Off (rev limiter)
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.
 Note: The Static Timing Test must be run with the engine RPM at 2,500 or above.
 Note: Do not forget to uncheck the Static Test Timing box once the test is complete, although
the “Test Timing” value becomes invalid once the TPS exceeds the Clear Flood TPS for safety
reasons (in case it is accidentally not disabled)
 Note: The RPM values, at the bottom of the dwell-time input table, are established when the
Load vs. RPM Axis table is configured.
 Note: If the fuel map VE values, around peak torque, are above 125, there is a good chance the
injector flow rates, inputted into the Operating Configuration/ Fueling Parameters table, are too
low. The opposite can also be true. If the VE values near peak torque are below 80, there is a
good chance the injector flow rates, inputted into the Operating Configuration/Fueling
Parameters table, are too high.
 Note: Be sure the ECU is properly configured, and the Base Fuel and Spark Tables are
calibrated before configuring and calibrating any of the following engine operating parameters.
 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.
 Note: Idle spark control is only active when the actual throttle position (the TPS % value shown
in the dash) is below the Max TPS for Idle value inputted into TPS the set up cell.
 Note:
A cam input (cam sync) is required for individual spark control, and injector
phasing to be operational . Without a cam-sync the GEN3 system still injects fuel
sequentially and allows for individual fuel control per cylinder. All coil-on-plug systems must
have the cam input (cam sync) hooked up and operational.
 Note: The GEN3 LS1 Coil-on-Plug (COP) and the “Stand-alone COP” systems are the only
GEN3 systems with bi-directional timing compensation.
 Note: The GEN3 ECU base system supplies 12 Volts (sources current) to the injectors vs.
providing a ground path (sinking current), as is the case with some competitive systems. This
approach provides better noise immunity and less power dissipation (heat) in the ECU!
 Note: Once the stages are turned on, they stay on until the TPS and/or RPM criteria are no
longer true or the Timer Enable goes low/off.
 Note: The “Timer” sequence will be reactivated, every time the throttle is closed and then
opened again, since the “Minimum RPM and Minimum TPS criteria are re-satisfied.
 Note: The timing values, inputted into the Start Line Timing table, are the
absolute values (not
timing retard values) the ECU will use when the Boost Parameters minimum RPM and TPS are
satisfied! If zero (0) is entered into the table, no starting line timing will be applied.