AMP EFI MS3Pro - AFR; EGO Control; Basic EGO Settings

7.2 Fuel Settings 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
• RPMdot for upper RPM re-engagement - When revs are falling more quickly than this RPMdot value
the initial RPM is used for fuel return. In-between upper and lower RPMdot values, the return RPM is
interpolated. This number must be larger than the ’lower’ RPMdot setting.
• RPMdot for lower RPM re-engagent - When revs are falling more slowly than this RPMdot value the lower
RPM is used for fuel return. This will happen when coasting down. If revs are falling more quickly then any
return transitions will be canceled and the return RPM will be raised. Set this so that clutch-in during fuel cut
does not stall.
• Duration of fuel adder - Adds additional fuel when fuel cut disengages to avoid a lean spike. This is how
long to apply the additional fuel, in seconds. This can be used with progressive fuel return, but is likely to
give undesirable results.
• Size of fuel adder - A percentage multiplier to control how much additional fuel is added when fuel cut
disengages.
• Delay EGO after fuel return - Turns off closed loop correction for this many seconds after fuel cut deacti-
vates, to give the time for the air to clear out of the exhaust system.
7.2.6 AFR / EGO control
This screen allows you to set up closed loop O
2
sensor feedback.
7.2.6.1 Basic EGO settings These settings are used to control the behavior of the closed-loop EGO algorithm.
• Algorithm - There are three options here:
– Simple - This method of closed-loop EGO control is well-suited to use with a narrowband O
2
sensor. If
the current AFR (or EGO voltage for narrowband) incorrect, the amount of fuel being injected is adjusted
by Controller Step Size every Ignition Events per Step ignition events. This method often results in the
actual AFR oscillating above and below the target.
– PID - This method incorporates a Proportional Integral Derivative control loop which tuned properly,
adjusts the amount of fuel being injected to quickly get to the target, and then maintains the target
without any oscillation (when tuned correctly). You tune the three proportional, integral, and derivative
numbers below when this mode is active.
– No correction: The O
2
sensor is used for data logging only and is not used for closed loop control.
• Use EGO Delay Table - You can select how often the EGO correction is updated based on either the number
of ignition events or by using a 12 x 12 table that determines how often to update the correction as a function
of RPM and engine load.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 158