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Originally Posted by FastOldGuy
Hmmm I assuming the AEM is reading the OEM knock sensor, correct? I guess I want to know how I decide when the knocks seen by AEM are important or not.
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you need to "map" what is not knock. turn the boost down, give it some good gas, keep the timing conservative... log some runs. you will generally get some voltage logging when the engine is under load. you want to use this to help create your knock table. just need to use a little common sense, there is not necessarily a particular voltage that "is knock". if at WOT at 10psi, and conservative timing at 6k rpm and you have a voltage reading of 0.32v. And then you go and bump the timing ten degrees and add 5psi you start getting readings of 3.4v, then I guess I would consider that knock.
I've seen people say 2.0v = knock. but personally I think if you pick a voltage to go by you are defeating the value of what the AEM brings to the table. fingerprint what YOUR engine does under conditions that shouldn't have "knock", then you use that to build a knock table.