One of the first challenges we faced was the lack of engine management systems that would fit the bill for a race car. Besides the needing specific control over our engine, we also needed a MAP/ Alpha-N based system for our planned ITB conversion, as well as quite a few more inputs for engine and telemetry logging.
We decided to use MSII-Extra for the engine management, because it’s all about learning rather than ready-made solutions.
Prototyping the system was quite rapid:
A quick peek into the engine revealed it was just a basic 60-2 crank wheel with a Hall sensor triggered on the rising edge. After that it was just a matter of matching up stock sensors to the correct inputs and of course, calibration. Spark output was done with 3x Bosch BIP 373 transistor. They are both tough and can handle the sustained high RPM output of rally.
Building the ECU was fairly straight forward:
We wired this into a stock harness and plug for fast disconnect
We did have a few issues with the spark dwell being artificially set too low, but other than that she runs like a champ… much stronger than stock after correcting the AFR’s and dialing in better fuel and timing curve.