Idle Advance Tuning; Tuning Idle Advance Engagement Settings; Tuning Idle Advance Timing; Idle Rpm Timing Correction Curve - amp e MS3Pro ULTIMATE User Manual

7.4 Startup / Idle
7.4.12.1 Idle advance tuning There are two main types of settings to tune for the Idle advance feature:
• Idle Advance engagement settings - These settings control the conditions under which Idle Advance will
engage.
• Idle Advance Timing curve - This curve controls the actual ignition timing once all the Idle Advance engage-
ment conditions have been met.
7.4.12.2 Tuning Idle Advance Engagement Settings The Idle Advance engagement settings should be set
so that idle advance will engage in roughly the same conditions that occur during normal, warmed-up idle.
Settings recommendations:
• Throttle closed TPS threshold (from engine state settings) - This setting should be set as low as possible.
Typically settings between 0.5% and 1% should be used. If numbers that are too low are used, then idle
advance may not engage if there is some play in the throttle body or there are minor electrical fluctuations
that cause the closed TPS % to vary. If numbers that are too high are used, then idle advance may engage
at undesirable times.
• Overrun MAP threshold (from engine state settings) - This setting should be set just below the load value
seen during a normal idle with no load on the engine. It is used to prevent the idle advance from engaging
while decelerating in gear.
• and CLT is above - This setting should be set to the temperature at which the engine idle characteristics no
longer change. Generally this is when the engine is fully warm.
• and after delay - This setting should be set to a value that is long enough for the engine RPM and load to
become stable before idle advance engages.
7.4.12.3 Tuning Idle Advance Timing In general, the most stable idle is reached by decreasing the idle timing,
and increasing the amount of air entering the engine (using an idle air valve or similar). As such, the idle advance
timing should be as low as possible while retaining a smooth idle. Since less timing is used during normal idle
conditions, as load increase, the timing should also increase to counteract RPM decrease when the load increases.

7.4.13 Idle RPM timing correction curve

This screen is available when you have enabled closed loop idle and Idle RPM Timing Correction. The RPM
delta number is the difference between the target RPM and the actual RPM. This curve is added to the ignition
AMP EFI MS3ProUltimate manual version 1.203, firmware 1.5.0, 5/23/2017
7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
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