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The system detects the onset of detonation and retards the timing on a per cylinder basis, up to a total of ten increments. A mode switch lets you select a maximum of either ten degrees or twenty degrees of knock retard. In the ten degree range, each increment is one degree, double that for the twenty degree range. When knock is detected, software determines knock intensity and decides how many increments to retard this cylinder the next time it fires. The control software retards in proportion to the knock event, up to a maximum of seven steps with one knock event. The system is always trying to re-advance to stock timing. In the ten degree mode, it re-advances at the rate of one degree every twenty revolutions, double that in the twenty degree mode. The system does not need a cam or crankshaft reference to determine which cylinder to retard. The unit is programmed to "know" that the knocking cylinder is the one that just fired, and that it won't fire again for two more revolutions. When the knocking cylinder comes around to fire again, software dials in the retard amount for that cylinder. It does this as each cylinder goes by, building up a different retard amount for each cylinder.
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