Originally Posted by
jsttry
Gday all, been trying to get rid of one little area of knock for a while now and just can't seem to nail it. At low RPM (1300-1400rpm) at 100% throttle in higher gears I get up to 4deg of knock. Most common way of replicating the problem is driving at 70-80km/hr in 6th and applying 100% throttle. (1400rpm, 100kpa MAP)
I have reduced the high octane table from 15-17deg to 10deg and smoothed the areas around the cell affected and still receiving 4deg. I have logged all forms of spark as shown in the attachment and can't see where the problem may lie. WB AFR's are also included in the screen shot. The screen shot shows that if you feed the power on the knock doesn't occur. Just can't seem the find a cure.
Any help would be really appreciated.
Jay.
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2003 VY SV8 m6, twin spark MAFless, exhaust, CAI, diff.