04-03-2014, 11:18 AM | #57 |
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@steve99 thanks for your work here, been reading through the posts and very helpful. My understanding is that IAM should be 1 and KC at zero? And any negative KC means a correction was made?
Will be doing some logging tonight so wanted to be sure of my understanding. Thanks!
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04-03-2014, 01:30 PM | #58 |
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It depends, if it's FBKC (Knock correction) on tip in then I think a small amount of knock is inevitable and if it's just pulling less than 1 deg then I wouldn't be concerned. You could pull half a degree or so in the whole area to see if it does reduce it though. If, however, it's showing FLKC (Knock Learning or Fine Correction) then I would definitely pull some more timing.
FBKC is active during rapid changes of load, ie transitioning to WOT. FLKC is when load is more constent, ie during WOT or near steady throttle states. You IAM will only drop if there is consistent high knock events in either.
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04-03-2014, 01:33 PM | #59 | |
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04-03-2014, 01:46 PM | #60 | |
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When you're looking how to adjust the timing look a data point or 2 before you see the KC in the log and reference RPM and load. Then see how quickly the revs and load are changing. Then if you look in the ignition table you may find that that area is 2x3/3x3/4x2 cells and I would take a small amount out of all of them.
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04-03-2014, 07:37 PM | #61 | |
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RPM 3000 load 1.0 , you may need to pull a bit in the adjacent cells load 0.9 and 1.1 as well. Log it a couple of times and see if its consistent around that area before you pull any more. Anything up to -0.6 or so is probably ok and does not seem to result in IAM drop. Definitely look at anything consistently over -1.0 correction |
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04-03-2014, 07:43 PM | #62 | |
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IAM should equal 1 or your tune is too aggressive for the octane level of the fuel your running. Pretty difficult to completely eliminate absolutely all knock but you need to keep it to a level where its not dropping IAM Up to -0.6 probably ok anthing above -1.0 consistently then best to pull a bit of timing maybe 0.35 at that rpm/load point and maybe the adjacent cells as you were probably crossing through them when knock first occurred. |
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04-03-2014, 09:00 PM | #63 |
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I've mentioned this in other threads but I will bring it up again. That pesky tip-in knock that doesn't seem to be affected by fuel quality or spark advance is most likely the result of the signal processing in the knock control system. Those settings are in there but they haven't been reverse engineered.
Before the knock control system as we know it existed, somebody had to configure the ECU to know what signal constitutes knock. Some guy in a lab somewhere made a decision about what frequency of vibration at the sensor will count as "real" knock based on listening to a microphone or looking at a cylinder pressure signal. Much of that development work at the OEM is done at steady-state on an engine dyno, with maybe some slight tweaks done later in the car. "borderline" knock is always a judgment call. So if you see some knock that seems very stubborn, it's probably because some vibration occurred and the signal processor was never tuned from the factory to ignore it. |
04-03-2014, 10:23 PM | #64 |
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I managed to get some 3rd gear WOT pulls yesterday (still on Shiv's standard v1.5x map): http://datazap.me/u/fizz/data-loggin...om=18041-18699
Would appreciate some comments on how it's performing at WOT, since my last two logs posted did not include high rpm pulls. The IAM is still low around 0.55, in fact this morning it's down to 0.47 Didn't have time to load @steve99's 98RON map but will do so today and log somemore over the weekend |
04-03-2014, 11:28 PM | #65 | |
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Looks the same as mine did on 98 before running that 98RON map Plenty of FBCK (Knock correction) 2000-3000 rpm causing your IAM to drop after is get a series of those events. It knocking between 5000-7000, your KC learned is dropping due FLKC (not monitored directly on OFT) this is occurring even though you IAM has already dropped to 0.5 or so 50% of the KC learned timing has already been pulled due IAM drop. You can pick the FLKC as sharp drops in the kc learned values in that RPM range. So looking at this bit of your log http://datazap.me/u/fizz/data-loggin...544&mark=18401 FLKC = KC Learned - (Knock Correction Advance Max A Table value * IAM) So at say 5200 rpm load = 1.1 FLKC = 0.34 - (5.98 * 0.55) FLKC = - 2.9 Last edited by steve99; 04-03-2014 at 11:57 PM. |
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04-04-2014, 12:09 AM | #66 |
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Thanks. Another thing....after flashing with a new map (i.e. your 98RON map) would the IAM automatically start at 1 again, or remains the same as it was prior to loading new map?
If it's the latter, how do I get it back to 1? Would it go up to 1 over time as it sees less knock etc? |
04-04-2014, 12:18 AM | #67 | |
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hopefully it will look like @akyp 's log 5000-7000 after you flash it http://www.datazap.me/u/akyp/2014040...zoom=3883-3974 |
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04-04-2014, 01:06 AM | #68 |
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Thanks again. By the way does my AFR at 5000 to 6000+ rpm look lean or ok?
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04-04-2014, 03:03 AM | #69 |
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04-04-2014, 10:27 AM | #70 | |
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What do ya think? Any particular issues? There's a number of times where the KC dropped, as low as -2.8 is that something to be concerned about? http://datazap.me/u/fizz/98ron-map-l...0&data=1-11-12 |
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