7.1 Basic / Load Sections 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
Here are what the individual settings do and what functions they affect.
• Use VSS - Allows using the speed sensor to trigger closed loop idle and other idle related functions.
• VSS threshold - If using VSS is turned on, the MS3Pro will not use closed loop idle, idle advance, or idle VE
above this speed.
• Fast acceleration threshold - This number should be set to slightly lower than the RPMdot range observed
at full throttle in low gear.
• Slow acceleration threshold - This number should be set to the RPMdot range observed while slowly
accelerating in high gear. It should be high enough to distinguish RPM jitter from intentional acceleration. If
you see the slow acceleration status triggering at idle, this number needs to be raised.
• Fast deceleration threshold - This should be set to a value that is slightly above the RPMdot when you rev
high and then let the engine fall back to idle. Use an RPMdot value from the middle of the rev range.
• Slow deceleration threshold - To set this, cruise in a high gear, then see what RPMdot value you get by
lifting off the throttle fully and decelerating. Set this value slightly above that RPMdot value. If you see the
slow deceleration status triggering at idle, this number needs to be raised.
• Throttle closed TPS threshold - Defines the maximum throttle position for idle functions. Typical values
range from 0.5% to 1.0% depending on how noisy your TPS signal is.
• Wide open throttle threshold - TPS value above which the engine is considered to be at wide-open throttle.
Typical values range from 99.0% to 99.9%, depending on the amount of noise in the TPS signal.
• Overrun MAP threshold - Below this MAP value, the engine is considered to be decelerating in gear instead
of idling.
7.1.4.1 How the MS3Pro uses engine states The closed loop idle and other idle related settings use all of the
settings:
• If using VSS, the idle functions are locked out above the specified vehicle speed.
• Closed loop idle will not engage if the RPMdot numbers exceed either the fast or slow acceleration / decel-
eration thresholds.
• The idle functions require the TPS to be below the throttle closed TPS threshold to function.
• If you select “Open valve on WOT” under closed loop idle settings, the MS3Pro will set the idle control valve
to fully open if the TPS exceeds the wide open throttle threshold, and set the valve back to its closed position
below this TPS reading.
• The closed loop idle will not operate when the MAP reading is below the overrun MAP threshold.
The overrun fuel cut uses several of the settings:
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 129
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