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if you carefully read the ATR documentation, you'll find that cobb thinks it's due to the fact that the stock ECU was very aggressive with timing during partial throttle (for gas economy reasons), and the KR is actually used by the ECU to bring the timing back to efficiency range if it happens to overstep the efficient bounds of combustion. make note: KR = knock RETARD, which does not imply (in our ECU) that there had to have been knock to set it off! ;)

now, christian can obviously be wrong about this, but i trust his judgment and insight on this, since it just makes a whole lot of sense here. knock at light load (which is when i usually see it on my car) just doesn't make sense.
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