ME221 Wire-In ECU

Fully Sequential Four Cylinder Engine Management
feature rich | accurate | proven

The ME221 Wire-In is a feature rich, best-in-class four cylinder injection engine management system.  Using the latest electronics and control strategies has resulted in a modern, powerful, VE based ECU, with an enhanced feature set which includes closed loop boost, lambda and full VVT control (not just switched).  Whether you are looking to get the best out of your fast road car or get a competitive edge with your race car, this is the ECU for you.

from £695inc

Buy Now


  • VE Based Fuelling
  • Fully Sequential Injection
  • Wasted Spark Ignition
  • Boost Control
  • Configurable Inputs/Outputs
  • Advanced Motorsport Features
  • Plug-n-Play Loom Options
  • Powerful MEITE Tuning Suite
  • Idle & Lambda Control
  • VVT Control
  • DSP Knock Windowing
  • Switchable Maps


  • Powerful 32bit 120MHz RISC processor
  • DSP Knock Processor
  • In-Built Coil Drivers
  • Closed Loop VVT
  • 22 Channels of IO
  • VR/HALL Crank/Cam Inputs

Plug and Play Looms

Our Plug and Play looms make the installation hassle-free and avoids the need for wiring-in or separately sourcing the connectors for your engine.  The ME221 is offered with a choice of loom options, including harnesses for common four cylinder engines in the Ford, Vauxhall, Peugeot and VW range.  We refuse to be beaten on quality; our looms are machine crimped, tension tested, electrically tested, nylon sleeved and clearly labelled.  These are carried out by an ISO 9001 certified partner.

Idle Control

The ME221 uses PID Closed-Loop Pulse Width Modulated (PWM) idle control which automatically adjusts itself to compensate for differences in temperature, and electrical load (e.g. cooling fans/AC).  This means that the ECU can be configured for OEM-like starting, warm-up and driveability. Spark-scatter means more stable idle response by varying the ignition advance to compensate for slight load variations.  This is particularly useful for throttle bodied applications where no physical idle valve is present.

Lambda Control

With support for either narrow-band or wide-band (compatible with all major wideband controller manufacturers), lambda feedback and long term trimming, the ME221 can offer perfect AFRs across the map and even generate its own fine VE adjustments table for later review. Closed loop operation also guarantees correct fuelling come MOT/IVA time – get those emissions right from the get go!

VVT Control

Normally only available at much higher price points, the ME221 comes equipped with full, closed-loop mappable VVT control. From the simple on/off system such as Honda V-TEC, through to the continuously variable system as used by the Ford ST170 engine. Optimised camshaft timing can make a huge difference in delivering a smoother, higher torque curve across the rev-range.

Volumetric Efficiency (VE) Based Fuelling

Accurate, modern VE based modelling of the engine means the system is faster to tune and incorporates accurate fuelling compensation for environmental changes such as air temperature and pressure.  Other outdated, pulse-width based management systems cannot accommodate for this.  Microsecond-accuracy fuel and ignition calculations are carried out over 500 times a second giving unparalleled transient response for the driver and consistent results.

Custom Functionality – Do Anything!

With the in-built general purpose tables modules, the ME range of ECUs allows custom functions to be easily created. From Oil Pressure/AFR/Boost combination engine protection to gear based traction control that modifies ignition timing and reduces nitrous flow, or even just a simple fuel gauge readout – the ME221/ME442 platform allows all of this. No longer worry “can the ECU do this?” – its now a case of “what do you want it to do?”. Chain multiple tables and strategies to create even more complex control systems. The ECUs features are limited only by your imagination!

Knock Protection

The ME221 features advanced knock control using DSP-processed measurement.  Tuners can make the most of per-cylinder angular windowing to locate and act upon signs of knock, ensuring engine safety and longevity.  Fuel enrichment, ignition retard and user-definable aggressiveness of these strategies allow you to achieve the best results on the dyno while preparing for the challenging environmental conditions on the road or track.

Video Install Guide

This short video demonstrates a typical installation of throttle bodies and the ME221 Wire-In ECU when supplied with the Zetec plug and play loom. We have designed this process to be as intuitive as possible so that it is a breeze to get up and running.

Boost Control

Fully-featured closed and open-loop boost control delivers accurate manifold pressures and turbo waste-gate management.   Several dimensions of customisable control are available including throttle, rpm and even gear based boost targets. Quicker spooling and stable boost means that optimised torque can be delivered under all conditions.

Motorsport Features

Launch Control, 2-Step Limiters, Water Injection, Flex Fuel & Anti-Lag are all built in to the advanced feature-set of the ME221.

Switchable Maps

Change between complete sets of fuel, ignition and boost maps on the fly – offering a choice of wet/dry or pit lane strategies at the flick of a switch.

Autotune & Long Term Trim

For best results we recommend that you have your system professionally mapped, however, the MEITE tuning software contains an easy to use auto-tuning system that will target and adjust the VE table such that the AFRs match your target fuel table.  The ME221 also features ‘long term trim’, which when enabled, will populate a 16×16 table showing recommended adjustments to your fuel table when you next connect to the ECU – with updates happening without a laptop connected.

Powerful Tuning Software

The Motorsport Electronics Integrated Tuning Environment (MEITE) is a powerful, flexible Windows tuning interface for our range of ECUs.  It has fully customizable layouts and interface, allowing a user to play with just the basics (starting from one of our many base-maps), or the advanced tuner to really get under the hood, the options are there.

Worldwide Tuner Network

We have over 100 authorised tuners across the planet, and the list is constantly growing – meaning you’re never far away from a tuning professional who has experience of the ME221 and will therefor get the best from your engine. That being said, any competent rolling road tuner will be able to use the MEITE software to tune the VE and ignition tables, and we are always on hand for further support if required on the day. Want to know where to find them? See the map here.

Dedicated After-Sales Support

While we have designed our systems to be as easy to setup as possible, we take pride in the quality of service provided by our friendly, full-time technical support team.  Should you ever need any assistance, you can get in touch via telephone or email.

Active User Community

We are delighted that our engine management systems are used in a variety of weird and wonderful projects.  Join our active community Facebook group for tips and tricks or to show off your pride and joy!

Loom Options

  • Unterminated/Universal 4 Cyl.
  • Ford (Zetec/Duratec/ST170/Puma etc)
  • Vauxhall (X16XEV/C20XE/Redtop etc)
  • Peugeot/Citroen/BMW (Bosch Type Sensors)

Physical Specifications

  • 22 Inputs/Outputs
  • 6-24V Range
  • 100x80x35mm
  • 195g

What’s in the Box

  • ME221 ECU
  • Your loom option choice
  • RS232 Extension Cable
  • Quick Start Guide
  • ME221 Vinyl Cut Stickers
  • Access to a wide range of free basemaps

Buy the ME221 Online

Visit our online shop now to configure and buy your ME221
Buy Now
  • Advanced VE Fuel Model
  • Sequential Fuel & Ignition
  • Digital Crank/Cam Triggers, Array of OEM Patterns Supported
  • Real-Time Switchable Fuel, Ignition & Boost Maps
  • Individual Cylinder Trims
  • Re-mappable Inputs/Outputs
  • 16×16 Floating Point Fuel, Ignition, AFR, VVT, Boost Tables etc
  • Multi-Dimensional Trims (IAT, CLT, VSS, DeltaError)
  • Closed Loop/Open Loop Boost, Idle, VVT, Lambda
  • Closed Loop VVT & simple V-Tec cam control
  • Water-meth injection Control
  • Flex-Fuel Support
  • DSP Windowed Per-Cylinder Knock Control
  • Motorsport Features such as Anti-Lag, Launch Control
  • 6x General Purpose Tables (Create any function you can think of!)
  • Long Term Trim and Auto-Tune


  • 120MHZ 32-bit RISC Processor
  • 5.5-28V Supply Input
  • RS232 Laptop Communication for real-time tuning
  • 80x120x40mm Alloy Casing
  • TE Multi-Lock Automotive Connector


  • 4x Injector Drivers (can be fully sequential Four cylinder or semi-sequential using 2 outputs, making 2 more spare Low Side Drivers)
  • 3x Spare Low-Side, 9A drivers (can be used for an array of functions idle drivers, vvt solenoid, cooling fan, fuel pump, boost control etc)
  • 2x IGBT Coil Drivers (Direct drive of 4cyl wasted spark coil packs)
  • 1x 12V Tachometer output
  • 5V Sensor Reference output


  • 7x Analogue Inputs (2 of which are dedicated for thermistor inputs for IAT/Coolant sensors)
  • 2x VR/Hall/Opto inputs for crank/cam sensors – an array of OEM patterns are supported
  • 1x Knock Sensor Input (DSP knock control built in)

Fuelling Control

  • Configurable Load/RPM BINS 16×16, 32 bit floating point Tables
  • Multiple Fuel Tables
  • Injection Angle
  • Priming Pulse Settings and Crank Pulse Settings
  • Cranking Enrichment
  • After-Start Enrichment and ASE Time Decay
  • Warm-Up Enrichment
  • Acceleration Enrichement TPS/MAP based with Coolant Modifier
  • IAT Correction Table
  • Idle Trims
  • 16×16 AFR Target Table factored into VE Equation
  • Speed-Density/Alpha-N with optional Blending
  • Injector Voltage Offset Table
  • Overrun Fuel Cut
  • Closed Loop Wideband/Narrowband Lambda control
  • Flex-Fuel secondary tables

Ignition Control

  • 16×16 32bit Table
  • Closed Loop DSP Windowed Knock Control On-board
  • Battery Voltage Dwell Correction 16×16 Table
  • Individual Cylinder Trimming
  • IAT and Coolant Trim
  • Spark-Scatter Ignition Idle Control
  • Flex-Fuel Control
  • Switchable Ignition Tables

Crank/Cam Triggering

  • VR/Hall/Opto Inputs as required
  • Auto-scaling, Parametric Noise Rejection
  • Range of OEM Patterns Supported

Idle Control

  • PWM based Closed/Open/Manual Diagnostic Modes
  • Cranking/Return to idle Settings reference Open-Loop table for wide-control
  • AC/Fan Auto-Idle Up Settings
  • PID Based for Accuracy
  • Fuel Modifiers
  • Ignition Spark Scatter
  • Jacked-Throttle Miss-Bang Idle Mode (Group-N ALS)

Knock Control

  • DSP Angular Windowed Knock Control
  • Settable Gains, Offset and Window Duration
  • Step Retard and Fail-Safe

Boost Control

  • Closed/Open Loop Boost Control by 16×16 RPM and Throttle table
  • Boost-by-Gear
  • Switchable Boost Tables
  • Over-Boost Protection
  • Pre-Start Duties
  • Anti-Lag Group-N

Variable Valve Timing

  • Fully Closed Loop PWM (Throttle X RPM table)
  • Locked Angle or Locked Duty testing modes
  • Basic On/Off Mode (Honda V-Tec)
  • Supported patterns include MX5 2001-2005 and Ford ST170, Ford Puma 1.7
  • PID Tuning with Oil Temperature triggering & safeties
  • Programmable Rest State & Offset compensation

General Purpose Tables

  • 6x General Purpose Tables
  • Custom Variables and Outputs
  • Modify Fuel, Ignition, Boost and Idle strategies from the GPTs
  • 3D and 2D tables with ability to “chain” tables together for create complex functions


  • Industry Preferred RS232 for ECU mapping/communication (USB Adaptor available)

Processing Power

  • 120Mhz 32-bit RISC Processor
  • Ignition Accuracy to 0.01 degrees, Fuelling to 0.001mS
  • 32-bit maths and tables (Table entries can have 8 decimal places for very high resolution)
  • ADCs/Analogue data reported to 16-bit accuracy
  • 20,000+ RPM

Analogue Inputs

  • Configurable “HRT”‘s for every analogue channel – use any sensor. Basemaps pre-set for factory sensors.
  • Wide-band O2 from external controller (0-5v)
  • TPS, IAT, CLT, MAP, Lambda standard inputs
  • Spare/unused analogue lines can be used for general purpose tables

Environmental & Physical

  • Automotive -20 – 85*C
  • Voltage 5.5-28V
  • Operating Current Approx 120mA @ 13v
  • Electrically isolated and protected inputs/outputs

Tuning Software (MEITE)

  • Everything real-time adjustable
  • Diagnostics and analysis functionality
  • Custom layouts, tabs and functions
  • In-built firmware update tool for ease-of-use
  • Custom “part calibration” import – use settings from other maps in a current map
  • Offline Editing of calibrations
  • Real-time tracing
  • Data-logging of all variables and Auto-Tune