As mentioned earlier, my ECU doesn't seem to want to advance the IAM above 11-12 when running on the stock map, indicating that it's encountering detonation and reducing timing advance. Well, I've tried new spark plugs (NGK IX Iridiums, stock heat range) and cleaned the MAF with electrical contact cleaner, but the IAM remains the same.
So either it's normal for cars with the fuel I'm running here in southern California, or there's something else in my engine causing excessive detonation, possibly a manufacturing defect leading to a hot-spot, excessive oil blowby or ??? I need to find out what a normal IAM is for stock WRXs running on California fuel before going any further...
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