How much Knock Retard is accaptable
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Ideally, you don't want any KR. In application, you may see some every once in a while. Personally, I take the 'more often than not' approach. If it happens more often than not for a given load/rpm, then chances are timing is too high. For example, I have my WOT timing at peak torque set to 26*. It doesn't show KR more often than not...so, I leave it. But, I will occasionally (1 out of 20 times) see KR there - especially on the warmer days.