The M4 is our 4 cylinder/rotary Sequential and 6, 8, 10 and 12 Cylinder Semi-Sequential Engine Management System (ECU) designed to provide you with the power and quality of our M800 ECU series but at lower cost by letting you option in only the features you require. It is designed primarily for performance street cars and bikes but by choosing the optional features it is perfect for competition use, especially its sequential injection capability.

The M4 uses 3 dimensional mapping of engine speed against throttle position, manifold pressure or mass air flow for improved accuracy. Ignition control gives you the ability to drive your ignition module and set your spark timing to be at its absolute best at all points. Sequential injection lets you fire the injectors at the optimum time in the engine cycle and is adjustable by RPM and load.

The Advanced Tuning Option gives many extra features including traction control, the ability to configure the ECU to your existing sensors, user definable load and rpm sites, 512Kb of on board data logging, Fuel Secondary Load Table, 3D Individual Cylinder Trim tables, Acceleration Advance, 3D Dwell time table, Traction Control and Launch Control, Wideband Lambda Control, Gear Change Ignition Cut, Anti-lag, Gear Detection and Ground Speed Limiting.

M4s have the accurate control necessary to meet legislated emissions requirements, including closed loop narrow band lambda control. The engine must, of course, be emissions capable.

The M4 can use nearly all original equipment and aftermarket ignition triggers, modules and coils, giving it unmatched flexibility. This avoids the cost and time needed to re-manufacture the distributor in order to meet the ECU's trigger requirement. The M4 can be triggered by either a hall effect switch, a logic drive or a magnetic sensor, with various signal types and with intelligent signal filtering insuring proper signal to noise ratio at any rpm.

Electromagnetic interference can play havoc with electronic devices, and MoTeC takes extensive preventive measures to reject low impedance conducted interference and to shield from radiated interference.

The heart of the M4 is a Motorola 32 bit microcontroller with a time co-processor, a choice which puts it at the leading edge of automotive control systems. Contained in a 132 pin surface mount package and consisting of over 420,000 transistors the M4 is built to internationally recognized quality control standards (ISO 9001). That the M4 reads its sensors 2400 times per second, and the entire control program is recalculated 200 times per second demonstrates its power. In personal computer terms the last PC to use a 16 bit processor was the '286' released in the early 1980's whereas 32 bit is still current technology. We were the first and to our knowledge the only people to have used this processor in this application.

MoTeC's unique software programmable switch mode drivers can trigger any injector with up to 70% less power usage than other products, drawing less power from the electrical system and generating less heat inside the ECU. Comprehensive diagnostics report on injector current usage and any wiring open/short circuit after each firing of the injector.

There is a comprehensive group of computer software tools available for the M4, including
bullet Engine setup, tuning diagnostics and utilities.
bullet Monitoring, data logging and analysis.
bullet Utilities for loading new program code and enabling special features.

This software has been designed with the emphasis on usability, enabling you to quickly optimize the setup for your vehicle.

Other thoughtful M4 features include the use of programmable flash memory chip to store the control program. This means that there is no program chip or EPROM to change to upgrade the program. When a new program feature is offered you simply send the M4 the new code over the cable and the latest features are available to you. Flash memory has also been included for the internal data logging, meaning that the recorded data will never be lost even if power to the ECU is removed. Flash storage also enables the M4 to retain information without needing internal batteries which have a finite service life.