7.2 Fuel Settings 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
• Ignition Events per Step - While closed-loop EGO is active and the EGO delay table is off, how often the
correction is run is determined by this setting. It is the number of ignition events per correction.
• Controller Step Size - This setting is only used with the "Simple" EGO algorithm. It controls how large each
correction "step" is. So if the AFR does not match the desired AFR, and Controller Step Size is configured
to be 1%, each time a correction is made, that correction will be 1%.
• Use Authority Table - Turning this on will allow using a table to determine how the maximum amount of
correction that can be applied applied as a function of load and RPM. For example, you might want to give a
large amount of control authority while cruising at light throttle, but reduce controller authority to zero under
boost to protect against the consequences of a failing oxygen sensor leaning out the engine under load.
• Controller Auth - This setting controls the maximum amount of adjustment performed by the closed-loop
algorithm if not using the authority table.
• Only correct above (AFR) - AFR readings below this level are not used and correction is turned off when
your receive this reading. Used to turn off EGO correction if the sensor is out of its accurate range.
• And correct below (AFR) - This parameter allows setting a maximum AFR for correction in combination with
the above setting.
• Active Above Coolant - Below the temperature defined by this setting, closed-loop EGO will not activate.
• Active above RPM - Below the RPM defined by this setting, closed-loop EGO will not activate.
• Active Below TPS - Above the throttle position defined by this setting, closed-loop EGO will not activate.
• Active below Load - Above the load defined by this setting, closed-loop EGO will not activate.
• Active Above Load - Below the load defined by this setting, closed-loop EGO will not activate.
• EGO delay after start - The time in seconds after engine-start before closed-loop EGO can be activated.
• PID parameters - These numbers are used to tune the correction when the algorithm is set to PID.
• EGO Sensor Type - This setting enables EGO control and allows the user to choose between using a
wideband sensor or narrowband sensor. The following settings are supported:
– Disabled - No EGO sensor enabled. Note that this will also disable AFR logging. If you wish to log
your EGO sensor information, but do not want to use closed loop correction, enable your sensor type
and set Controller Auth to zero instead.
– Narrowband - Sensor in use is a narrowband sensor.
– Wideband - Sensor in use is a wideband sensor.
• Number of Sensors - This setting is used to select the number of oxygen sensors in use by the MS3Pro. Up
to 12 sensors can be configured.
7.2.6.2 EGO ports The EGO Ports settings allow the user to select the input port used to read the signal from
the oxygen sensor. The number of EGO ports available depends on the number of sensors selected. The “Normal
EGO” input is reserved for the primary O
2
sensor, but you can optionally use one of the three other analog inputs
for the primary, or an O
2
sensor on a CAN network. The second and subsequent sensors may not use “Normal
EGO”, but may use any spare analog input or a CAN device.
7.2.6.3 AFR/EGO Sensor Mapping Use this menu to assign which injector channel is associated with what O
2
sensor input.
7.2.6.4 Tuning
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 159
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