How to set clear flood tps, Rev limit, Rev_limiter_configuration – Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI System Hardware & BigComm Software User Manual
Page 50: Two_step_rpm
BigStuff3 Pro SEFI System
Version 2.1 – February 2011
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operating temperature and preferred idle speed, adjust the TPS so that the TPS % value shown in the
Dash (see screen print directly below) reads between 1% to 2%.
The dashboard can be configured to appear at the bottom of most of the BigComm software screens.
An example of a dashboard is shown below. See
for more details (described later in this
manual).
How to Set Clear Flood TPS %
Set the Clear Flood TPS % value to 80%. This setting tells the ECU not to add fuel when the
following conditions exist.
o
The engine is cranking (between 75 and 400 RPM).
o
The throttle position is at 80% or greater (user specified)
If these conditions are met, the ECU does not add fuel during cranking. This function is especially
useful when attempting to start a flooded engine. Once the fuel is cleared from the engine, release the
throttle to restart the engine.
Rev Limit
The “Rev Limit On RPM” and “Rev Limit Off RPM” section of the Rev Limiter Configuration table
refers is focused at “Engine Saver” RPM control. The 2-Step RPM Lo and 2-Step RPM Hi section of
the Rev Limiter Configuration table is focused on engine launch RPM control.
Rev Limit On RPM” and “Rev Limit Off RPM” section allows the user to set the maximum engine
RPM before fuel shutoff occurs. This setting is referred to as “Rev Limit On RPM”. The screen also
includes an input for “Rev Limit Off RPM,” which is the RPM where fuel will be reintroduced to the
engine. A small RPM band (at least 200 RPM) is required between the “Rev Limit On” and “Rev
Limit Off” RPM inputs, so that the engine has a small band (hysteresis) between the rev limiter on and
off limits. The hysteresis, for supercharged/blower engines should be at least 1,000 RPM.
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.
Rev Limit On RPM” and “Rev Limit Off RPM” section allows the user to set the:
2-Step RPM Lo = 2-Step (engine RPM launch) RPM
2-Step RPM Hi = 3-step (engine RPM launch) RPM
The 2-step Lo (2-Step) and 2-Step Hi (most commonly referred to as 3-step) control are not standard
features on the GEN3 distributor ignition based systems. In base system form, the 2-step wire can be
used for starting line timing retard for stick shift cars and turbo applications. The 2-step and 3-step
functionality are available as options on the GEN3 distributor ignition based systems.
TPS Signal in the Dash.