7.2 Fuel Settings 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
– Use Inj I/J - Use the I and J injector channels in batch fire. This is your only option for engines with four
to eight cylinders.
• Secondary V3 Alternate - This setting controls whether the secondaries (when using the I/J outputs) alter-
nate between injector channel 1 and injector channel 2, or inject simultaneously on injector channel 1 and
injector channel 2. The following settings are available:
– Alternating (2 squirts) - Alternate between injector channel 1 and injector channel 2. Note that when in
alternating mode, the firmware injects 2 squirts per cycle.
– Simultaneous (1 squirt) - Squirt fuel on injector channel 1 and injector channel 2 simultaneously. Note
that when in simultaneous mode, the firmware injects 1 squirt per cycle.
• Gradual Transition - This setting enables the ability to gradually reduce the pulse width of the primary
injectors and gradually increase the pulse width of the secondary injectors as staged injection engages. This
setting is most useful when the secondary injectors are located far away from the primaries on the intake
tract. Gradual transition and associated settings are not available when using table-based staged injection.
The following settings are available:
– On - Gradual staging is enabled. The associated settings will be used to control how quickly the secon-
daries are engaged.
– Off - Gradual staging is disabled. When staged injection engages, the pulse width will go immediately
to the fully staged width.
• Transition events (ign events) - This setting is used when gradual staging is enabled to determine how many
ignition events it will take to go from no staging to fully staged.
• Primary reduction delay (ign events) - This setting is used to delay the reduction of the primary pulse width
by the number of ignition events after the secondaries start coming online. It is only enabled when the gradual
transition feature is enabled.
• Secondary Enrichment (ms) - This setting is used to inject more fuel on the secondaries than the fully
staged calculation determines. This is useful when there is a small lean spot just after staged injection fully
engages. This setting is only available when the gradual transition feature is enabled.
• Primary staging threshold (units) - This setting is used to determine when staged injection engages when
using RPM, MAP, TPS, or Duty. It is not available when using table-based staging.
• Primary staging hysteresis - This setting is used to determine when staged injection shuts off. For example,
if RPM is selected as the staged injection first parameter, and the primary staging threshold is 4100, and the
primary staging hysteresis is 300, then staged injection will shut off the secondaries and return the primaries
to their normal pulse width at 3800 rpm. This setting is not available when using table-based staging.
• Second parameter - This setting is used to add a second method for determining when to stage. Note
that this setting should not be set the same as the first parameter setting. This setting is not available with
table-based staging. The following settings are available:
– Off
– RPM
– MAP
– TPS
– Duty
• Secondary staging threshold (units) - This setting determines the RPM, MAP, TPS, or Duty at which the
secondary staged parameter allows staged injection to engage. This setting is not available unless a second
staging parameter is enabled.
• Secondary staging hysteresis (units) - This setting is used with the secondary staging threshold setting to
determine when staged injection will shut off. This setting is not available unless a second staging parameter
is enabled.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 154
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