Originally Posted by M3PO
I don't think that is the answer. I definitely have some knocking/pinging just like he describes also. It's not any kind of resonance, it's your classic metallic detonation sound.
Yes, I saw that post when I first read this thread but neither of the descriptions seem anything like what I'm hearing unless the term 'resonance' is being used in a non-standard way. The noise I'm hearing is not a narrow-band frequency-related vibration or oscillation which goes away as the frequency changes. (In fact my car *does* have a slight exhaust system resonance at exactly 2700rpm - and this goes away with a small variation in revs as expected).
The issue I'm referring to *sounds* like your classic pinking- but I wouldn't expect if from a modern engine like this.