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      11-12-2012, 10:33 PM   #60
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Drives: 2017 M4 MG ZCP
Join Date: Oct 2012
Location: San Francisco

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Originally Posted by M3PO View Post
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.