3.2 Inputs 3 MS3PRO HARDWARE
• Closed or open loop idle speed control
• Closed or open loop boost control with gear or speed based tuning options
• CO
2
and dome pressure based boost control
• On/off or closed loop continuously variable valve timing control - supports up to 4 channels
• On/off or progressive nitrous control
• Traction control
• Rally anti-lag
• Rotary support - can run up to 4 rotor engines with separate leading and trailing spark tables
• Staged injection
• Table switching
• 16 x 16 fuel and spark tables - can be reconfigured to function as 30 x 16 or 16 x 30 by switching tables
based on RPM or load
• 2 or 3 step rev limiter with no-lift shifting
• Wideband AFR target tables
• Flex fuel sensor input
• Allows repurposing injector or ignition outputs as general purpose outputs, or high current outputs as injector
drivers for 12 cylinder sequential applications
• Real time barometric correction
• A/C and cooling fan control with idle compensation
• Safety shutdown based on AFR or EGT input
• Motorcycle shift cut
The MS3Pro’s nylon case is somewhat unusual in a world of aluminum cased aftermarket ECUs. You may be
wondering how it can dissipate heat. Our strategy for heat management is simple: You don’t need to dissipate
heat if you don’t make heat in the first place. The MS3Pro uses a power supply optimized for high efficiency, and
if you want to use circuits that generate large amounts of heat like peak and hold injector drivers, they can be
ordered as an external box. The plastic case is the same grade of nylon used in many OEM ECUs and other
underhood components.
Most of how to set these inputs up is covered in the wiring guide, but we have in depth information if you need
to know everything about the circuits’ capabilities. (Most users can skip straight to Section 4 and start wiring the
unit up, but for those who want to know the full details, here they are!)
3.2 Inputs
3.2.1 Engine speed
The MS3Pro uses a Maxim MAX9926 adaptive differential conditioner for engine RPM. This circuit can accept
input from variable reluctor, Hall effect, or optical sensors, and the input’s absolute maximum rating is 400 volts.
The MAX9926 input circuit cannot be triggered off the negative terminal of an ignition coil - this may damage the
circuit. For fuel only installations, you will want to use a 12 volt square wave tach signal, like the one provided by
most aftermarket ignition modules.
Some spark modes, discussed in the ignition section of the manual, use the digital I/O channels as well. These
come into play for systems that either use very high frequency signals (such as the Nissan or Optispark optical
systems), require more than two sensors for engine position (such as the Audi “tri-tach” system), or use more than
one channel of variable valve timing.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 23
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