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I've been out street tuning my fuel map, datalogging and going through each rpm load zone, then pulling over and making adjustments. I'm using audio knock detection headphones as I drive, and I am using the wrx base ignition map from the link g4+ for my ignition timing settings, retarding each rpm column by 5% before drive through that rpm column. I'm logging my knock levels as I do this, and I have set a knock threshold for each rpm. As I was tuning my 4500rpm zone I noticed a higher amount of knock noise from cylinders 3/4. I couldn't hear knock through my headset, however I am not confident in differentiating knock, as I don't believe ive ever heard it on my car. Ive attached the datalog from the run, and what puzzled me was that the higher noise from cylinders 3/4 begins at very light throttle (40kpa), which leads me to believe it's not knocking. Would this be a matter of reducing cylinder 3/4's gain?
Also, any tips in how to purposely induce knock on the my engine (ej205) so that I can learn to differentiate between that and engine noise? I tried greatly increasing the timing in a few different cells (38/40 degrees at 2500rpm 100kpa for example) but i couldnt hear anything and no spikes in the datalog to show knocking. Do these engines require a greater load/ rpm before they knock?
Thanks for your help, so many questions I know, I'm just a rookie ;)
there is no Ignition angle in your screen shot.
Also you should log knock in ECU logger at 100Hz minimum.
I would also suggest to "zoom" Lambda target/lambda to at least 1 to 0.75