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Old 08-11-2014, 11:48 AM   #1
wparsons
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KC learned, what does it mean?

Looking at a more recent log I noticed that KC learned has some bigish values, while IAM is 1, knock count is 0 and FLKC has very low occasional counts.

Is KC learned positive compensation (more timing), or negative compensation (timing being pulled back)?

http://www.datazap.me/u/wparsons/aug...ta=1-5-9-11-12
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Old 08-11-2014, 12:08 PM   #2
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Found this
http://www.ft86club.com/forums/showp...11&postcount=2

Quote:
Originally Posted by Kodename47 View Post
MAF Voltage: Voltage of the MAF sensor. There is a table that converts this voltage to g/s that the ECU then uses. This table may need to be configured to your sensor.
VVT intake: The angle of the cams of the intake VVT system
VVT exhaust: The angle of the cams of the exhaust VVT system
Ignition advance: Do you mean ignition timing? The angle before top dead centre (BTDC) that the sparks ignites in the cylinder. Too much advance and you'll get knock, but generally the more advanced you go then this increases power.
KC learned value: The ECU has a base ignition table, and an advance table. The KCL value is how much timing the ECU is adding onto the base value from the advance table. If the KCL values = the advance table then the ECU isn't pulling timing and all is happy.
STFT: This is what the ECU adds/removes from the fueling as an instant response to the target AFRs while in closed loop.
LTFT: Multiple occurrences of STFT will result in LTFTs being applied. Both LT/STFT are done on load based so you don't get a consistent reading across the full rev range or from different pedal positions. You ideally don't want massive swings in LTFT, STFTs aren't necessarily an issue.
Adv multiplier: The easiest way to describe this is the multiplier of the ignition advance table: Base ignition timing + (Ignition advance timing x IAM) = Ignition timing. FYI, Ignition advance timing x IAM = KCL. This will vary depending on knock detection. It will drop if consistent knock events are detected. It won't however necessarily drop upon every detection of knock.
So it looks like it should move around, and the way to know if it is a concern or if there is knock is comparing the KC Learned value to the advance table.
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Old 08-11-2014, 07:25 PM   #3
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Quote:
Originally Posted by wparsons View Post
Looking at a more recent log I noticed that KC learned has some bigish values, while IAM is 1, knock count is 0 and FLKC has very low occasional counts.

Is KC learned positive compensation (more timing), or negative compensation (timing being pulled back)?

http://www.datazap.me/u/wparsons/aug...ta=1-5-9-11-12
KC learned or knock control learned is the values in the Knock Correction Max A table minus any knock correction being applied by the ecu due to IAM leass than 1 or FLKC. If you have no knock and IAM is one the KCLearned will equal the values in the Knock correction advance A table for each rpm/load point.

see links below for further info on knock correction in thread called Knock correction for Australian fuels but applies for everywhere
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Old 08-16-2014, 12:32 AM   #4
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Just got my OFT installed today and was driving around town watching the values as the car learned after loading stage 1. I got concerned seeing KCLearned go to as much as 5 following a gear change. My IAM was a solid 1 the whole time. Reading the above posts it looks like the KCL is a good thing. Is that correct?
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Old 08-16-2014, 12:37 AM   #5
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Originally Posted by Weasel Soup View Post
Just got my OFT installed today and was driving around town watching the values as the car learned after loading stage 1. I got concerned seeing KCLearned go to as much as 5 following a gear change. My IAM was a solid 1 the whole time. Reading the above posts it looks like the KCL is a good thing. Is that correct?
Read the Ecu logging links below should explain it
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