3.2 Inputs 3 MS3PRO HARDWARE
• Allows blending multiple load types, including specialized mode for independent throttle bodies
• Supports a wide variety of OEM cam and crank position sensors
• Individual cylinder trim tables for fuel and ignition
• Accelerator pump or model based acceleration enrichment
• 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
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. The MS3Pro Ultimate also adds an opto-isolated input channel on separate
pins to allow triggering off the negative terminal of an ignition coil. This works with inductive ignitions - breaker
points, GM HEI, Ford Duraspark, factory Chrysler ignitions, the Pertronix Ignitor I or II, and most 1970s era Bosch
distributors. It does not work with the Pertronix Ignitor III (which does not have any sort of stable tach output) or
CDI type ignitions such as the MSD 6A.
AMP EFI MS3ProUltimate manual version 1.203, firmware 1.5.0, 5/23/2017 Page 24
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