7.8 Advanced Engine 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
The % is the amount of the second (higher numbered) table to use, with the remaining percent being on the
lower numbered table. The X axis can be set to several different types of inputs:
• TPS - Throttle position
• MAP - MAP sensor reading
• RPM
• MAF load
• Flex% (percent ethanol in fuel, as measured by a flex fuel sensor)
• VSS1 - driven wheel speed
• Gear - transmission gear position
• RPM * Load / 100
• Generic sensor inputs
7.8 Advanced Engine
7.8.1 Speed and gear sensors
The vehicle speed sensors (VSS) allow one or two wheel speeds to be monitored. The MS3Pro allows one or
two speed sensors, with the second one being used to measure wheel slip for traction control. The inputs read
from either a wheel/axle mounted pickup or a perhaps pickup that is part of the transmission. The input can be
magnetic (with suitable interface) or more directly a hall type input. This input is converted to a linear speed (mph
or kph). The shaft speed inputs work in a similar way to the vehicle speed but calculates to rpms. It could be used
as gearbox input shaft speed to monitor convertor or clutch slip. The VSS output feature provides a pulsed output
in proportion to the VSS for driving a digital speedometer. The gear detection calculates the current gear selected
in the gearbox by a number of methods.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 228
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