Normal knock correction and final multiplier - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Sliver_bullet · 06-14-2022, 01:23 PM

Hello everyone,i tried to search around and found nothing that could help me. i have a Turbo’d FRS on E85.
when it comes to Advance Multiplier and Knock Correction, what are the values that you should be worried?
I know 1.0 for AM and 0 degrees knock correction is ideal. But does that mean i should worry if they dont stay there?
I noticed that when i go about half throttle i start to get a couple degrees of Knock Correction in the low/mid RPMs. If i cruise at a somewhat constant speed for a while, AM starts to drop down to the .70’s.Not sure if i should worry, car feels perfectly fine to me. Thanks in advance

Westen86 · 06-14-2022, 06:06 PM

Im no tuning expert, but it sounds like the tune is expecting full E85 and getting E60-70. Knock is never good. I advise bringing it to a tuner and backing it off a bit.

DarkPira7e · 06-14-2022, 06:30 PM

Advance multiplier changing is concerning. Datalog and submit it here, you can upload to datazap.me

Sliver_bullet · 06-14-2022, 07:17 PM

I have a flex fuel kit so it should be correcting it right? Im currently sitting at 80%. Sorry i should have clarified that.
Should i send a cruising log? Or a stop and go log?

steve99 · 06-15-2022, 03:55 AM

knock at cruise especially in high gears is common issue. A lot of tuners dont check the tunes on highway just on dyno so it gets missed.

can be fixed

knock correction or flkc of -1 or less is fine , especialky if advance multiplier stays at 1. The occasional drop to 0.9 is ok but if its considpstently dropping to 0?7 or below probably worth looking at adjusting tune

FrickingReallySlow · 06-15-2022, 03:13 PM

Quote:

Originally Posted by steve99

knock at cruise especially in high gears is common issue. A lot of tuners dont check the tunes on highway just on dyno so it gets missed.

can be fixed

knock correction or flkc of -1 or less is fine , especialky if advance multiplier stays at 1. The occasional drop to 0.9 is ok but if its considpstently dropping to 0?7 or below probably worth looking at adjusting tune

Is this because of close loop AFR target being closer to stoichmetric? tip in knock from the throttle plate? or closer to lugging engine at <3K rpm in 6th gear

steve99 · 06-15-2022, 05:45 PM

Quote:

Originally Posted by FrickingReallySlow

Is this because of close loop AFR target being closer to stoichmetric? tip in knock from the throttle plate? or closer to lugging engine at <3K rpm in 6th gear

Can be combination of all three
to little fuel
too uch tiing
too little fuel on throttle transients

ues high load in high gears tends to cause knock

Sliver_bullet · 06-17-2022, 03:51 PM

Update, it appears that my overpipe hitting the subframe was triggering the knock sensor. Advance multiplier has been at 1.00 for a couple of days vs before i simple drive to work (about 20 minutes) would make it drop.
There is still a few degrees of knock correction on partial throttle acceleration. My question is what should i be monitoring? Knock correction or ignition correction? Also what is FLKC and IAM?

tomm.brz · 06-18-2022, 07:11 AM

both of them

flkc = ignition correction ap fine
knock correction = ign correction ak knock

both are relevant

AM = advance multiplier
IAM = initial advance multiplier, meanign the advance multiplier as set for right after startup, in oem tunes is set at 0.7 for example

06-14-2022, 01:23 PM	#1
Sliver_bullet Member Join Date: Aug 2018 Drives: 2014 Argento Scion Frs Location: San diego, ca Posts: 10 Thanks: 0 Thanked 3 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Normal knock correction and final multiplier Hello everyone,i tried to search around and found nothing that could help me. i have a Turbo’d FRS on E85. when it comes to Advance Multiplier and Knock Correction, what are the values that you should be worried? I know 1.0 for AM and 0 degrees knock correction is ideal. But does that mean i should worry if they dont stay there? I noticed that when i go about half throttle i start to get a couple degrees of Knock Correction in the low/mid RPMs. If i cruise at a somewhat constant speed for a while, AM starts to drop down to the .70’s.Not sure if i should worry, car feels perfectly fine to me. Thanks in advance

06-14-2022, 06:30 PM	#3
DarkPira7e Rust bucket enthusiast Join Date: Feb 2017 Drives: 2013 Turbo Firestorm FRS Location: Vermont Posts: 3,932 Thanks: 3,198 Thanked 4,095 Times in 2,045 Posts Mentioned: 31 Post(s) Tagged: 0 Thread(s)	Advance multiplier changing is concerning. Datalog and submit it here, you can upload to datazap.me __________________ Turbo FR-S Build - Build Thread JDL EL Recirc manifold, Boostlab BL58x Turbo w/ T51R, 17x9 ARC-8, IAG block

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06-14-2022, 07:17 PM	#4
Sliver_bullet Member Join Date: Aug 2018 Drives: 2014 Argento Scion Frs Location: San diego, ca Posts: 10 Thanks: 0 Thanked 3 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I have a flex fuel kit so it should be correcting it right? Im currently sitting at 80%. Sorry i should have clarified that. Should i send a cruising log? Or a stop and go log?

06-15-2022, 03:55 AM	#5
steve99 Banned Join Date: Dec 2013 Drives: FT86 Location: Australia Posts: 7,998 Thanks: 1,035 Thanked 4,987 Times in 2,981 Posts Mentioned: 598 Post(s) Tagged: 2 Thread(s)	knock at cruise especially in high gears is common issue. A lot of tuners dont check the tunes on highway just on dyno so it gets missed. can be fixed knock correction or flkc of -1 or less is fine , especialky if advance multiplier stays at 1. The occasional drop to 0.9 is ok but if its considpstently dropping to 0?7 or below probably worth looking at adjusting tune

06-17-2022, 03:51 PM	#8
Sliver_bullet Member Join Date: Aug 2018 Drives: 2014 Argento Scion Frs Location: San diego, ca Posts: 10 Thanks: 0 Thanked 3 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Update, it appears that my overpipe hitting the subframe was triggering the knock sensor. Advance multiplier has been at 1.00 for a couple of days vs before i simple drive to work (about 20 minutes) would make it drop. There is still a few degrees of knock correction on partial throttle acceleration. My question is what should i be monitoring? Knock correction or ignition correction? Also what is FLKC and IAM?

06-18-2022, 07:11 AM	#9
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,193 Thanks: 500 Thanked 1,064 Times in 773 Posts Mentioned: 65 Post(s) Tagged: 0 Thread(s)	both of them flkc = ignition correction ap fine knock correction = ign correction ak knock both are relevant AM = advance multiplier IAM = initial advance multiplier, meanign the advance multiplier as set for right after startup, in oem tunes is set at 0.7 for example

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