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Is the knock detection method AKA "Ion Sensing"? I recall someone was trying that with one of the cheaper aftermarket ECUs. Was it Megasquirt?
Never heard of knock detection with ion sensing. It only works when there's a voltage differential on the spark plug. GM mostly uses it with wasted spark ignitions to figure out which cylinder is on the compression stroke to use it as a cam sensor.
There is no way it is heavy because Mazda used the gram strategy to remove all the unused grams from the car. Also, any attempts to remove weight from the car will unbalance it.