https://docs.emtronaustralia.com.au/articles/knock-control/index.htmlKnock (detonation) is one of the biggest killers of a performance engine. Emtron ECUs monitor individual cylinder knock and make cylinder-specific ignition adjustments to keep the engine safe without unnecessarily impacting performance through a global ignition trim. The log below is taken from a mildly tuned EVO IX engine: Top group — engine speed, ignition angle, and knock short/long-term statuses Second group — knock level per cylinder as processed by the ECU from the knock sensor, with knock level thresholds shown Third group — short-term timing retard applied per cylinder Fourth group — long-term timing retard per cylinder, generated as a proportion of the short-term retard value to reintroduce ignition timing more gradually over a longer period Knock Control Log – EVO IXHugoen-us