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Verifying your A/F ratio throughout the operating range will eliminate that one perameter as a cause for detonation. You can then start looking at timing, fuel quality, boost level, temperatures, engine age, etc. Lots of things can cause detonation.
One thing I would do if in your shoes is a dyno run. You can log all the data while having you or someone else physically stand by the engine and listen for detonation in real time. A quiet muffler will help (obviously).
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
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