MS3 Pro PNP ECU 90-05 Mazda Miata MX-5

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The MS3Pro ECU is the undisputed champ of PNP solutions for your Mazda Miata. These aren't your typical home-brew DIY systems. Rock solid hardware with a decade long lineage of user interface/software.  


  • Fully Plug and Play Installation – No wiring required for basic functionality.
    • Average install time is under 1 hour!
  • Base map is pre-loaded to help your engine start on the first turn of the key
  • Real time tuning and data logging with a laptop connection
  • 8 GB internal data logging with built in SD card
  • Supports most aftermarket wideband sensors

Completely configurable, live tuning:

  • 16×16 Fuel Tables allow high resolution tuning
  • 16×16 Ignition Tables
  • Multiple Acceleration enrichment strategies
  • Closed Loop Idle Speed Control
  • Air Conditioner Control
  • Up to 4 sequential fuel injector channels with individual trim tables (minor wiring change required if you want to enable sequential injection, as most of these cars were not wired for sequential injection from the factory)
  • Onboard high impedance injector drivers
  • Allows removal of stock airflow meter
  • Allows adding a variable TPS – no special mods needed!

Advanced Feature Set (included as standard features on PRO)

  • 12×12 Air Fuel Ratio Target Tables for use with wide band O2 sensor for precise tuning and table trim.
  • Built-in 2-step rev limiter / launch control with flat shift
  • Onboard high impedance injector drivers
  • Real time barometric correction
  • Programmable voltage regulator control for NB alternator swaps
  • Internal 4-bar MAP sensor reads up to 44PSI of boost
  • Overboost protection
  • Rally style anti lag
  • Closed loop boost control (Requires boost solenoid kit)
  • Knock sensor input with adjustable sensitivity, crank angle windowing, and more
  • Table switching input. Change fuel and spark maps on the fly for different fuels, nitrous activation, etc.
  • Input for flex fuel sensor – switch between E85 and gasoline on the fly!
  • CANBus connector allows interconnection of other MegaSquirt-compatible devices for additional functions (EGT Input, Automatic Transmission Controller, Additional Sensors…..the possibilities are limitless!


The MS3Pro comes equipped with full closed loop VVT control. This can be VERY useful if you plan to retrofit a 2001+ VVT engine into a an earlier model chassis, as you can simply use one of the spare outputs to drive the VVT solenoid, as well as keep the later crank/cam sensors.

What's included?

  • Miata MS3Pro PnP ECU
  • MSPNP RS232 serial tuning cable
  • Tuning Software and Documentation on USB memory stick
  • 6′ Vacuum Hose for MAP Signal and ‘T’ fitting
  • Four Screws for ECU mounting
  • Registered version of TunerStudio and MegaLog viewer included
  • Make sure to use our Custom TunerStudio Dashboard, designed specifically to help make tuning your new build intuitive and easy!


NOTICE: ECU's and Electronics cannot be returned under any condition!