"Region C (red) Region C is used for high-rpm operation, where engine noise and vibration are too high for accurate knock sensor readings, but knock control is still required. Region C is calculated as the weighted sum of regions A and B, the weighting values being defined by ROM constants." More details: http://twinturbo.net/nissan/300zx/forums/technical/view/1127497/Z32-Knock-Control---Do-you-know-your-ABCs.html
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