Product Description
The Electromotive TECm is a replacement motherboard for the Motronic ECU that controls many mid ’90s BMWs. The TECm is not an aftermarket ECU with an adapter. It is a custom-built motherboard designed specifically as a direct replacement for your Bosch Motronic motherboard with built-in support for BMW-specific features such as VANOS and A/C control. Electromotive TECm can even be installed so that it leaves no outward sign of its presence. All interfaces to your car are supported. Plug in an Electromotive TECm and the factory tach, CEL and fuel consumption gauge all work and the reliable factory engine harness stays intact. You get the advantages of a modern race ECU without the lost time and expense engineering and building a custom harness or changing sensors.
The Electromotive TECm replaces Motronic ‘413’ and ‘506’ ECUs, including EWS units. They are common on BMW M50 (E36 325, E34 525) or S50 (E36 M3) engines and are often used in the popular ODB2 (M52, S52) to ODB1 intake and harness performance upgrade.
Who can use a Electromotive TECm? If you race in a series where you must manage different tunes for classification purposes (e.g., NASA GTS) the Electromotive TECm is your ticket. Maybe you plan to build or already have a forced induction engine and need to take control of it. Or maybe you are one of those performance-minded people who makes incremental changes and wants a platform that will grow with you. The Electromotive TECm is an easy-to-implement solution for these projects and more.
For a product matrix comparing our current TEC line or management systems, please click here.
- Direct bolt-in replacement of Motronic ‘413’ and ‘506’ ECU’s motherboard, including EWS units
- VANOS (Cam) control based on rpm and throttle position
- Full sequential injection
- Idle Air Controller (IAC) support built in
- MAF air flow meter support
- Factory A/C control including WOT compressor disconnect
TECm is based on the Electromotive TECgt Race ECU and uses the same easy-to-use Windows-based WinTEC4 software. Because of this, it inherits the patented multiprocessor, high-resolution ignition that Electromotive is famous for, as well as most of the features of the Electromotive TECgt
- 16×16 fuel and timing maps
- Coolant temperature-based ignition and fuel compensations
- Intake air temperature-based ignition and fuel compensations
- EGO (O2 sensor) target tables with closed-loop control
- Automatic VE tool built into software (learns fuel map on the fly)
- High and low impedance injector drivers built in
- MAF and MAP sensor support (up to 7 bar)
- Warm-up enrichments
- Over boost fuel cut
- 3 rev limiters
- Idle control
- Fuel and timing trim by cylinder
- On-board data recording
- CAN Bus support to feed external data loggers (AIM MXL, XG Log, DL1, DL2)
Unused pins in the OEM Motronic are exploited in the Electromotive TECm to create two general purpose inputs (GPI) and one general purpose output (GPO). They allow for additional advanced features to be built in such as:
- Boost control (when using the MAP feature)
- Nitrous control (rpm and load enable nitrous)
- Nitrous retard (multiple stage timing retard)
- Auxiliary fuel pump control
- Fan thermo control
- Intake runner control
- Custom controls based on rpm and load
- Shift light
- Valet switch
- On-board data recording
- Timed advance
- Timed power cut (no lift shift)
- Fuel trim
- Advance trim
