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i'm fitting one of these this week, roojai said that acceptable knock levels are written in the instructions. Have you not got them handy? If mine arrives today i'll let you know what it says in mine.
Ok just got mine installed. It says that you will likely get 1 green led lit and maybe 2 which is ok, orange LED's indicate the likely start of mild knocking and red = stop.
So in short 1-2 green led's are acceptable, i think most knock displays that have one light would be the equivalent of the red LED in our case...
Took mine out for a run last night, i get one green lit all the time over 5k WOT with the occasional 2nd green flickering. Gonna put v-power in to see if that makes any difference