7.2 Fuel Settings 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
When TunerStudio is connected to the ECU, this presents the same information in a different grouping - it shows
each pin and what function (if any) is assigned to it.
7.1.19 Expansion I/O Pins List / Usage
This screen is similar to the I/O Pins Showing Usage screen, but does the same for devices connected to the
MS3Pro via the CAN connection, such as a CAN-EGT or a MicroSquirt running IO Box or transmission control
code.
7.1.20 Gauge and setting limits
Allows you to specify RPM levels and maximum load values on the gauges, as well as the highest values you can
enter into the load and VE tables. The other settings are explained below.
• Allow WUE Below 100% - The warmup enrichment is a multiplier, with 100% being no enrichment. Values
under 100% will reduce fueling to less than the base fueling. This is ordinarily an undesirable thing to do, so
the MS3Pro will lock you out of this. However, LPG and gaseous fuels often use an evaporator or expansion
device heated by engine coolant. When the engine is cold, the evaporator delivers colder, denser fuel than
normal, which may require reducing warmup enrichment below 100%.
• Preferred Speed Units - This is used for speedometer gauges, boost by speed, and other speed related
functions.
• Preferred Length Units - This is used for entering tire size and similar parameters. The MS3Pro allows
mixing metric and English units.
• Air Cooled Expanded CLT Range - Adjusts the default range of the coolant temperature gauge. Liquid
cooled engines seldom have a coolant temperature very far beyond the boiling point of water, but if you’re
measuring the cylinder head temperature with your CLT sensor, the temperatures can, and do, go much
higher. When set to normal, maximum coolant temperature on the dash gauge is 250 degrees F. When set
to expanded, maximum coolant temperature is set to 450 degrees F. Note that you will need to reload the
dash for this to take effect.
7.2 Fuel Settings
This contains all settings outside of the Basic / Load Settings related to fuel, other than nitrous control. Injector
dead time, the injector small pulse widths, AFR table, and the VE table are discussed earlier.
7.2.1 Injector timing table
This is a 3D tuning table where you specify the injection angle for the cylinder receiving the injection. Like ignition
timing, this is in degrees BTDC. The Engine and Sequential Settings menu allows you to define whether this
angle is the beginning, end, or middle of the injection event.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 151
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