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

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.

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

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?

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

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

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?

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