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Old 01-27-2008, 09:02 PM   #1
Scooby Newbie
Member#: 148417
Join Date: May 2007
Chapter/Region: TXIC
Location: Baytown Texas
2002 WRX

Default Knocking

Being that I'm not fully aware of the number relation of FLKC, FBKC and their severity, I thought that I would make a post to get some input from this log where I cruised in 5th gear on my daily ride from work. Apparently there is some knock correction that has been going on while in the lower range of my map.
My question is how do the numbers relate to knock severity? I’ve attached a log where I’ve filtered out all of the non-knock events and there is also a log of the entire ride home.
My next question for those who are familiar with timing tuning is, when knock is present do you pull the total of the fine learning knock from the base timing or do you pull total of feedback knock out of base for that specific range?

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Last edited by maxbserr; 01-28-2008 at 10:04 AM.
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Old 01-28-2008, 10:00 AM   #2
Scooby Newbie
Member#: 162417
Join Date: Oct 2007
Chapter/Region: E. Canada
Location: Toronto
1994 WRX-RA


I'm not anywhere near good at tuning, but I've been trying to read a lot of logs and interpret them better, so here's my shot.

The FLKC looks to be just pulling some timing here or there to maintain stoich, (at these throttle and load readings, it's still CL fueling no?), so I wasn't to worried about that. The FBKC seems to only occur going from a 0% throttle, to a ~15% throttle, so I would imagine it has an occasional knock right there. It hasn't affected your IAM, and it's only happening a very small percentage of time, so I'd say it's fairly normal.

Please wait for someone with experience to chime in though, I'm still very new to this.
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