The ME221 MX-5 Plug-In is the leading Engine Management System for the Mk1 (2 Plug NA) MX-5 / Miata, years 1989-1995 1.6/1.8

Every major and respected MX-5 Tuner in the UK, as well as the biggest, Flyin’ Miata in the US, now uses and recommends the ME221 Engine Management System over other systems.

Nick, Skuzzle Motorsport – review from MX5Nutz
“I have just spent the last few weeks playing with the fairly recently released Motorsport Electronics ME221 PNP ecu and finally after years of supplying, fitting, mapping MegaSquirt of all shapes and sizes, I am proud to announce that from this day on, my ECU of choice for most MX5 applications is now the ME221.”

If you would like additional features such as CAN, EGT, In-Built Wideband and Logging, check out the ME442 Plug-In range.

It supports the 1.6 and 1.8 model from the same hardware, and also fits the OEM case, which means the conversion installs tidily into the OEM position. The only extra thing you need to do besides plugging it in is run a MAP vacuum hose (supplied) from the ECU to the intake manifold.

Uses the ME221 ECU Core (NXP Automotive Processing Power)
Supports factory sensors.
Truly Plug-In : Supports both switched TPS and linear TPS conversions.
16×16 Fuel and Ignition Tables (with dual table switching)
VE based fuelling algorithm.
Run any type of high impedance injectors.
DSP Knock Control
In-built 60psi MAP sensor
Closed Loop Boost, Lambda and Idle Control
Launch Control
Fully Sequential on 1.8 version
In the field regular firmware updates and improvements
Uses the powerful MEITE tuning studio.
An open approach to firmware/software features.
Supplied with rolling road certified and developed basemaps for either turbo or NA setups.

Package contents:
ME221 Plug-In Core Board
Vacuum Hose
Stickers

Please note that if you are using a switched type TPS sensor as fitted to the 1.6 model, we suggest installing a variable TPS to give better throttle response – the 1.8 model already has the variable TPS as standard. Also, if you wish to run without a MAF sensor, then you will need to install an Intake Air Temperature Sensor – available in the options list.

Proven Compatible with the following OEM ECU Codes (and others with the 2 -plug ECU):
B6HA
B64F
BPF8
B63H
BPF3