Their is more to it that what is written here, this is just the stuff I think I understand but no guarantees note that FLKC can sometimes be positive as ECU returns timing it pulled previously.įBKC is active during rapid changes of load, ie transitioning to WOT.įLKC is when load is more constant, ie during WOT or near steady throttle states. If, however, it's showing any FLKC (Knock Learning or Fine Correction) over -0.7 then I would definitely pull some more timing. If it monitoring over -1.0 then you could pull 0.35 of a degree or so in the area to reduce it. If it's FBKC (Knock correction) on tip in then a small amount of knock seems inevitable and if it's just pulling less than -0.7 or so deg then I wouldn't be concerned. Note the OFT logging has now been upgraded to log FLCK (although it not quite working properly yet) I used Tactrix logging to find FLKC as it was just easier, no reason you cannot use OFT it is now able to log FLCK directly. If you IAM is less than KC learned values are always less.Įg you log shows at RPM=6000 Engine Load=1.1 IAM=1 KC Learned = 3.6 you look in "Knock Correction Advance Max A' table and find value is 2.1 then you have knock (FLCK) around that point. The CPU Averages values between the RPM/LOAD cells so hardly ever exact. ![]() If is less (by an amount say more than 0.5) then you likely have knock or your IAM =1 than it likely knock (FLKC). So you need to look at the KC Learned value for an RPM vs Engine Load point and compare it to values in "Knock Correction Max A" table in RomRaider for your ROM.įLKC = KC Learned - (Knock Correction Advance Max A Table value * IAM) You can usually pick it as a sharp chunk out of the KC learned value as opposed to a fairly smooth curve. Which would mean looking for a drop in the KC Learned value when compared to the "Knock correction advance max A table" that was not due to IAM. So You don't have to derive it from KC Learned (KCA) value. If you have an OFT it now monitor's FLKC directly. KC Learned = Knock correction Learned - Should match values in "Knock Correction Advance Max A " for each RPM/Engine Load point table if you have no knock. IAM= Ignition advance multiplier (coarse correction)įBKC= Feed back knock control (coarse correction) KCA = ((Values in Knock Control max A Table) * IAM) + FLKC (usually negative) ![]() ![]() If your IAM drops below 1 then it decreases the timing added by KCA, effectively retarding timing over entire rpm/load range. If you get enough FLKC it can also cause the IAM to dropįLCK retards the timing instantly by decrementing the KCA value at that point instantly. Conversely if no FBKC knock events are detected over a period of time (seems to be a longer period) your IAM will start to rise again towards 1.įBKC used to alter IAM (coarse correction) does not retard timing instantly. Something like events over -1 ((FBKC) and say 4 in a minute or so, just guessing here. Not sure of the exact parameters but appears. Total_Timing = Base_timing + KCA + other offsets due IAT/coolant temp ectįBKC is what will cause your IAM to drop if its severe enough and often enough. KCA = (values in "Knock Advance Max A table" * IAM ) + FLKC(usually negitive) OFT logging now monitor's FLKC and Knock correction (FBKC)įBKC is most noticeable in 2000-3200 RPM high loadįLKC is most noticeable in 5000-7500 RPM high load The ROM's below should vastly reduce knock on 98 and 100 RON fuels, they don't completely eliminate the 2000-3200 high load tip in knock as this seems to be a trait of these motors, but its very much reduced and IAM no longer drops below 1. It will generally result in your IAM dropping to 0.7 or below in city driving, it will recover with light pulls to over 4500 RPMġ00 RON seems much better at high RPM/LOAD 5000-7500 RPM and does not need timing pulled in that area (on my car anyway), but 98 knocks in this area as well. Note it knocks on STOCK tune more than on Open Flash Tablet Tunes in this area. ![]() Much less severity and less often but very occasionally you can get IAM to drop in city driving. While its less on 100 RON (United) their is still some knock evident in 2000-3200 RPM range. And your IAM will likely be dropping to less than 1.Īfter seeing the knock on 98/100 I would only run 95 in an absolute emergency. If your in Australia your BRZ/86 will knock on 98 or even 100 RON fuel.
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