7.1 Basic / Load Sections 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
• Secondary Fuel - "multiplicative" or "additive" - whether the values in VE table 1 and VE table 2 should be
multiplied or added together when the secondary fuel table is in use. Selecting “Blend Curve” allows blending
between two tables based on a curve (selected under the Table Choices menu).
• Multiply MAP - For Speed-Density installs this should normally be set to "Multiply". This number uses the
air density, based on the MAP sensor reading, in the main fueling equation. If this is turned off on a speed
density install, the VE table values at low loads can be very small, while any values under boost will head
off to well over 100%. Turning this on will flatten out the table and make it a bit more manageable. About
the only reason to turn this off when running speed density is on installs with a highly unstable MAP signal.
Turning this on in alpha-N mode will result in a mode that is something of a hybrid between alpha-N and
speed density, as the pulse width will be scaled for MAP readings.
• Incorporate AFRTarget - selects whether the target AFR value from the AFR table is used in the main
fueling equation. See the tuning section before changing this setting.
• Stoichiometric AFR - this is used with the previous setting. 14.7 is typically used for gasoline. Many
racing fuels may not follow this exact value; if you are changing from one race fuel to another and know the
stoichiometric point for both, this can be used to change the fueling directly.
• Primary Ignition load - sets the load value for ignition table lookups.
• Secondary Ignition load - enables an optional secondary blended ignition table. The blended fuel and spark
tables can be used to effectively enlarge the table size. This table can be additive or use a blend curve.
• AFR table load - sets the load value for AFR table lookups
• EAE table load - sets the load value for Enhanced Acceleration Enrichment curve lookups.
7.1.2 Rev Limiter
MS3Pro allows for fuel or spark based rev limiting. You can also allow the rev limit to change as a function of
coolant, so as to set it low before the engine warms up, or even drop the rev limit if you overheat.
7.1.2.1 Hard rev limit
• Hard Rev Limit (RPM) - This is the point at which a fuel cut or complete spark cut is applied. The coolant
temp limiter, if used, will override this setting.
• Soft Limit Zone / Hysteresis - The RPM needs to fall this far beyond the hard limit before the fuel cut is turned
off. If you are using a spark cut or a progressive fuel cut, the cut will start to phase in when you reach this
many RPM below the hard cut as well.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 126
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