7.1 Basic / Load Sections 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
• Scaling - Scales the tach by a user selectable percentage instead of a fixed ratio. Numbers greater than
100 speed up the tach output (for example, if using a four cylinder engine with an eight cylinder tach, start
with 200% scaling) while numbers less than 100 slow down the output (for example, if using an eight cylinder
engine and a four cylinder tach, start with 50% scaling). You can adjust this to correct for inaccuracies in your
gauge.
Note that you can select other channels for tach output, but these pulse from floating to ground. To obtain a 0-12
volt signal from one of these channels, you can wire a 1K resistor from the output to a switched 12 volt source.
7.1.6 Fan control
While you can control a fan by simply stating it comes on at one temperature and off at another, MS3Pro gives you
more options. You can adjust the idle speed to compensate for the increased electrical load, or factor in throttle
opening or speed as well. Many cars have enough airflow at cruising speed to not need an electric fan at that point,
so you can shut it off to save power. The MS3Pro outputs can drive a relay; don’t wire them to the fan directly.
• Fan Control On - Enables the MS3Pro fan control
• Fan Control Idles up - Whether the fan activation should also raise the idle
• Output Pin - The output pin for the fan relay
• Idleup delay - how long to wait after raising idle before turning on fan
• Idleup duty - PWM open-loop duty cycle to increase by
• Idleup steps - additional stepper idle steps to open
• Idleup target rpm increase - target rpm to increase by (if using closed loop idle control)
• Fan on temperature - turn fan on above this temperature
• Fan off temperature - turn fan off below this temperature (must be lower than "on" temperature)
• Allow fan when engine off - allows fan to run in key-on, engine-off situation
• Fan on with A/C on - whether the fan should be automatically turned on to help cool the A/C radiator.
• TPS shutoff enable - turning this on will allow the MS3Pro to shut off the fan above a maximum throttle to
reduce the alternator load on the engine.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 131
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