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Originally Posted by solidONE
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That knock is very minor anything 0.7 or less no rearly anything to worry about
I cannot say I understand the exact working of the knock control system but the FLKC and FBKC you see are the result of some complex calculation the ecu does based on input from the knock sensor.
Then it appears further calculations/timers ect are done/applied and these FLKC detections are applied to the timing for a period of time. sometimes you can see positive FLKC as the ecu returns timing. FLKC appears to be applied to the total timing almost instantly and removed soon after probably if certain condition met
since the OFT interrogates the ECU at about 5 times a second its possible it may miss some FLKC events, I generally see all events when logging with tactrix at about 20 times a sec
FBKC seems to be the input to the coarse correction calculation and if certian levels and frequency of FBKC occurr then the IAM is adjusted according to the level and frequency of the FBKC detections. Some time later if no or less FBKC is detected the IAM will start to climb towards one again. This is just what I have observed and deduced after reading the romraider explaination's and may not be 100% correct.
As I understand it the FBKC and FLCK are events or detections by the knock sensor then the ecu decides what its going to do based on the level and frequency of those detections and what knock correction mode the ecu is working in which aparantly switches so rapidly it can appear to be operating in rough/fine correction mode togeather.
their is aparantly a fine learning table FLKC in ecu ram similar to this for wrx
Their is some explanation on this over at
www.romraider.com (subaru knock correction) its for WRX but appears to hold true for our ecu's