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Just like many high-end, race-car-oriented, standalone ECU systems, the Modotek allows users to fully control all aspects of fuel and ignition timing. This is the timing table for our ‘91’s engine. With mass-air load primarily in the 0.5-to-1.6 range, optimal timing for Sleeper’s 331 landed at 30 degrees. As you see, this relatively low mass air-load spectrum leaves a lot of extra cells. While we didn’t get into those areas to set timing for our combination, each engine will use a different part of the table depending on the amount of airflow the engine consumes.