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It all makes sense. But I wonder if the DME just makes small corrections to one load/speed point on the map at a time or if it tries to smooth the map around the point of correction. The O2 sensor isn't fast enough to relay good data while the engine is dynamically changing, like changing loads or RPM. It needs the engine to be steady for a while to know what the conditions are at the intake relative to the exhaust.
Although, I suppose if they charactorized the lag, maybe they've figured out how to use that data too. Maybe.
i doubt that the dme is sophisticated enough to incorporate the 02 sensor lag into analysis, nor to interpolate the curves. rather, i *think* it tends to apply the stft to 'regions' of the maps - idle/coast, under load, wot, etc.
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