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DIYAutotune MS3P
MegaSquirt MS3 Pro ECU
Price: $1,049.00


8' wiring harness (+ $150.00)
MAP sensor

Detailed Description

Built to order. Allow 2-4 weeks lead time for assembly.


MS3 Pro

Fully programmable standalone engine management

** This is a universal ECU. You will need to determine pin outs and generate your own base maps **

Why MS3 Pro? Entry level ECU's in unsealed metal boxes simply don't survive in the harsh environment of motorsports. We found our endurance racing cars cracking boards. dust, grit and water contamination, broken wires from inadequate strain relief.  Have thousands invested in your build and plan to race it? Don't scrimp with a home made board and box ECU kit.

Real time tuning and data logging with a laptop or bluetooth connection.
Supports most aftermarket wideband sensors. This is the same ECU 949 Racing uses on it's fleet of record setting and national championship winning Miatas.


Software features:

  • Supports speed density, alpha-N (TPS based), or MAF based fuel and spark tables
  • 1 microsecond injector pulse width resolution
  • Tables for nonlinear injector behavior at small pulse widths
  • 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 two separate wastegate outputs, and gear or speed based tuning options
  • On/off or closed loop continuously variable valve timing (VVT) control - supports up to 4 channels
  • On/off or progressive nitrous control
  • Traction control by VSS or RPM
  • Rally anti-lag with rotational idle
  • 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 (launch control) with no-lift shifting
  • Wideband AFR target tables
  • Flex fuel sensor input for easy switching between gasoline and E85 - can automatically change fuel, ignition, and boost maps based on ethanol content of gasoline
  • Knock control with adjustable crank angle windowing can adjust sensitivity based on RPM or which cylinder is firing
  • 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 (external sensor required)
  • A/C and cooling fan control with idle compensation
  • Safety shutdown based on AFR or EGT input
  • Sequential shift cut and air shifter control
  • Diagnostics to detect and ignore failing sensors - can even automatically switch from speed density to alpha-N in the event of a MAP sensor failure     

Hardware features:

  • Freescale MC9S12X 16 bit, 50 MHz asymmetrical dual core processor
  • 10 saturated injector drivers
  • 8 logic level ignition outputs
  • 3 high current (5 amp) general purpose outputs - 2 can be reconfigured as additional injector drivers
  • 3 medium current (3 amp), high frequency general purpose outputs
  • All unused injector and ignition outputs can be used as spare on/off or other outputs.  This ECU has a LOT of I/O!
  • 1 stepper H-bridge driver
  • Camshaft and crankshaft differential inputs - supports VR, Hall effect, and optical input
  • 12 volt tach output
  • Fuel pump output
  • 8 analog inputs (5 dedicated sensor inputs, 3 spare/general purpose)
  • 4 spare digital on/off inputs
  • 3 spare digital frequency inputs
  • 2 knock sensor inputs
  • RS232, USB 2.0, and CAN communication
  • Onboard 8 gigabyte SD card for internal data logging
  • Internal ECU temperature sensor
  • Real time clock
  • Temperature range: -30 to +80 degrees C (-40 to +85 without battery for real time clock)

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