7.3 Ignition Settings 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
7.3.3 Dwell Table
This table allows you to specify dwell (before battery voltage correction) as a function of RPM and ignition load.
This allows increasing dwell under boost, then backing it off at low load to reduce the amount of heat put into the
ignition system.
7.3.4 Cold advance
The cold advance feature can be used to run more advance on a cold engine. When cold, an engine typically
requires more advance for normal operation. Although the function’s original intended purpose is to add more
timing advance with the engine cold, this can adjust timing in either direction at any temperature. Many OEMs are
reported to retard timing during warmup to more quickly bring the catalyst up to operating temperature; you can
also use the cold advance table to replicate this function.
Ensure that the advance figure in the highest temperature point is zero; this will allow the spark timing to follow
the advance table when warmed up.
7.3.5 MAT based timing retard
High inlet air temperatures (MAT) can make an engine more prone to knock; this is especially the case on boosted
engines where small changes in ambient air temperature can produce much larger post-compressor temperature
changes. This feature allows the timing to be retarded at higher MAT readings for greater engine safety.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 166
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