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my NA engine with turbo had knocking sound if top up 97, 95, 92 when toup in both SG/Malaysia.
But the knocking is gone if 98 or V power.

Is it the tuning for ignition timing wrong cause knocking?

my boost max 0.7 bar.

When boost reach 0.3 bar, knocking sound came.
No kocking for 98 and above fuel.
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