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If your ECU has the ability to control the timing against engine "det", why not use it. It always comes down to what you programs as an acceptable level of engine noise.
The ECU has no clue what detonation is, it only knows noise and pressure if a pressure sensor is included. You can always turn it off.
I agree that reading the plugs or measuring the combustion pressures against what the ECU records as knock is a must. But many today have never been schooled on how to read a spark plug. But reading a plug is a factor of two. First you have to know what you are looking for and second you have to submit the plug to a running condition and look only at the plug under those conditions.
Looking at the plugs while changing the oil will probably give you a false reading as I cannot comprehend changing the oil immediately after doing a hard cut a WOT at max torque RPM.
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