Plug & Play Infinity ECU for E46 M3 The Infinity ECU for the E46 M3 includes an application-specific start-up calibration and connects to the E46 M3 via a Plug & Play harness that is sold separately (PN 30-3510). It is designed to fit in the factory location and AEM’s engineers were able to take advantage of the E46 M3’s sophisticated CAN bus system to incorporate several features directly into factory buttons on the steering wheel and console.
A Complete Stand Alone ECU The Infinity ECU combines with the Plug & Play harness to replace the E46 M3’s factory ECU. It controls all of the engine functions including the VANOS variable cam control system and Drive by Wire (DBW) system.
Plug & Play Harness with Expansion Port AEM’s sealed, weatherproof Plug & Play harness (sold separately) includes dual Lambda ports, an AEMnet port for communication with other AEMnet enabled devices and an expansion port with a Deutsch DTM 12P connector for adding common aftermarket sensors including fuel pressure, air inlet temperature, MAP, boost control solenoid and ethanol content. The expansion port also includes a sensor ground, 5v reference, power from relay and high side output for activating a solenoid, and switched inputs for auxiliary radiator fan, boost target and no-lift shift.
Map Switching AEM incorporated the Infinity’s map switching capability into the factory steering wheel buttons, eliminating the need to wire in and mount an ancillary position switch. Using InfinityTuner software, users can now select from 8 modes for boost control maps, fuel maps, timing maps, Lambda target maps and more and select maps on the fly using the factory cruise UP (+) and DOWN (-) buttons. To ensure that drivers know which mode they are in when not connected to the Infinity ECU, when the vehicle is keyed ON the tachometer moves to a specific RPM point to indicate which map the Infinity is using (for example 3k RPM indicates Mode 3, 4k RPM indicates mode 4, etc.). When the driver changes maps while driving, the tachometer will temporarily change from revs to the RPM point that indicates the switched mode for one second and then resume normal tachometer operation. Actual engine RPM will not be affected during this one second period.
Three-Step Rev Limiter Users can configure the CRUISE ON/OFF (1/0) as a Temporary three step limiter switch through the InfinityTuner software (vehicle speed or time after launch dependent), and can set rev limits at specific rpm by points or set a flat limiter and use it as an RPM hold for launches.
Definable Rev Limit on Tachometer The E46 M3’s tachometer incorporates an LED ring around the outer perimeter to suggest rev limits, and the Infinity ECU uses these LEDs to indicate user defined active rev limits. For instance, if the Coolant Protect feature in InfinityTuner is set with a rev limit to 5k RPM when the engine is cold, the rev limit is indicated via the lights around the perimeter of the tachometer until defined coolant temps for normal operation are achieved. Whatever rev limits a user configures will always be displayed, with the lowest defined rev limit value taking precedence in the LEDs surrounding the tachometer. This feature applies to any protect features, the three step limiter, etc.
Traction Control The E46 M3 comes with wheel speed/ABS sensors from the factory, and the Infinity is able to use them for traction control via fuel cut, spark cut or retracting DBW throttle response. This eliminates the need to install additional sensors for traction control. The CRUISE SET/HOLD (speedometer icon) can be configured as a traction control enable or disable button through the InfinityTuner software. Users can define a specific slip target for traction control in the software and turn it on or off using this button, or set two slip targets and use it for a mild and aggressive traction control strategy.
User Definable DBW Throttle Response Using the Spor…