7.4 Startup / Idle 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
• TPS shutoff % - If using TPS shutoff, MS3Pro turns off the A/C output above this TPS opening value.
• TPS hysteresis - Once the TPS based A/C shutoff has engaged, the TPS needs to fall this amount below
the TPS shutoff value to turn the A/C back on.
• VSS shutoff enable - Turning this on allows shutting off the A/C above a set speed.
• VSS shutoff speed - If VSS shutoff is enabled, the A/C will turn off above this speed.
• VSS hysteresis - Once the VSS based A/C shutoff has engaged, the speed needs to fall this amount below
the VSS shutoff value to turn the A/C back on.
• RPM shutoff enable - allows shutting off the A/C above a maximum RPM to prevent damage to the com-
pressor.
• Maximum RPM - If RPM shutoff is enabled, the A/C will turn off above this RPM.
7.4.12 Idle advance settings
The Idle Advance feature is useful to fine-tune ignition timing at idle. It is particularly useful to help catch sudden
load increases on the engine at idle by increasing timing when load increases to help the engine generate more
power, keeping RPM from dropping severely. Like many idle related features, this requires configuring the engine
state settings.
• Idle advance on - Enables or disables this feature.
• Idle RPM timing correction - Setting this to on allows the MS3Pro to use the Idle RPM Timing Correction
curve to add or subtract timing based on how far away the idle speed is from the target speed.
• PID idle activates - You can either trigger the idle advance settings when the conditions for closed loop idle
are initially met, or after the PID delay causes the ECU to start actively correcting the idle speed. The engine
state setting
• and CLT is above (degrees) - The engine coolant temperature must also be above this value before idle
advance will engage, if using engine states.
• and after delay (sec) - If using engine states, all the other conditions must be met for this amount of time
before idle advance will engage. If not using engine states, it will use the PID delay from the closed loop idle
menu.
• Idle Advance Timing curve - This is a four-point curve with Load as the X-axis and timing as the Y-axis.
This curve determines the actual timing once the idle advance feature has engaged.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 191
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