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what are the safety knock threshold valve while I am tuning an engine. if just because I want to know if I can set my own threshold
valve or this valve already exit and I have to use them, what are this valve or there are different for any particular engine.
There isn't a single knock threshold that you can apply to every engine and/or ECU. It will depend to a large degree on the signal level from the knock sensor as well as how effective the signal processing is. Have a look at the webinar we did on knock control using the Motec M1. This discusses how to establish a knock threshold.