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Originally Posted by Nardi330
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shiv@vishnu could you look at above log especially 5000-7000 where KC learned drops to 0 thanks
Yep Iam =0.8 at start recovers to 0.95 with driving over 4000 rpm
Can see a few Knock corrections over -1 in the 2000-3000 range this is most likely cause of IAM drop.
Also If you have a look at your "KC learned" in the 5000-7000 area and compare it to the values in the "Knock correction max A" table the values are 2-3 degrees lower.
as your IAM =0.9 that will be dropping values by 10% but the values are lower than that which indicates FLCK (which OFT does not monitor but can be derived.
Your KC Learned is dropping sharply over 5000 and by 6000 it near 0, where it should be following the values in the "Knock correction Max A" table multiplied by IAM. So their more correction going on.
Look at rpm over 6000 your KC learned has dropped to "0" in most cases.
example around 6000-6200 rpm engine load 1.2 , Knock correction max A table says value should be 3.87 if all good ie IAM=1 and no FLCK.
As IAM=0.9 KC learned should be 3.87 * 0.9 = 3.4 but it is 0 this indicated knock correction likely due FLCK of -3.4 degrees.
My adjustments only target the 2000-3500 area, but our fuel 98 RON appears to be resulting in knock correction in the 5000-7000 rpm area as well.
Yours does seem worse than mine and I suspect this may be due to your running a bit leaner than mine (still ok I believe) due your exhaust mods.
I only log about -1.5 knock correction FLKC (logged with tactrix) in 5000-7000 rpm area.
Could pull more timing but your just nobbling the tune. If I run united 100 octane this high RPM knock retard is gone or very much minimised
For me I'm running my modded advance map to reduce knock 2000-3000 and stop IAM drop plus running 100 RON fuel to stop high RPM FLKC retarding timing.
Note the stock tune does the same in both areas on 98 RON
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