I'm not sure but it seems that you're to much lean ,8 psi with 13 afr is not the best.
What fuel octane do you use?

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I'm pumping California 91 Octane. I don't have access to anything better out here. I'll try another has station next.

Are there any other fields that I should monitor to get a better picture of what's going on?

My spark plugs are past the 5 year mark by 1 year but well below the 60k miles mark. Could that be an issue or would that be more related if there was a misfire?

 

I think you should use 93. You don't have misfire , change the spark plugs and fill it with 93 and than get a log.
Can't you log a full pull from 2500 to 6000 and let us see if it's just for a moment or for the all rpm rang?
and I want to see what's going on with the afr for the all rpm range not just on one point like you let us see.

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I wish I had 93. I don't have access to that in California. I think our 91 might even be more lean, if that's even possible, than the majority of the country. I'll try to log a full pull.

Also my car is all stock. Would the AFR data still be reliable without a wide band?

 

Wide band is always more accurate.
The stock o2 sensor is not accurate at all on wot.

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"Knock" is a normal thing to the engine. The sensor or microphone inside the engine is very sensitive. As long as the Knock reset after a few minutes then you should be good. If it doesn't then you may want to consider to have your car turn by tuner or e-tune. I used to have the same problem and took it to a tuner and it's now pretty stable. I still see Knocks but just for a seconds or so and this only happens when I do a hard pull.

 

How do I tell if the knock resets?

 

The basic way to tell is your AP Knock should show 0.00. The smaller number right below is the basic log of the high and low of the Knock. When you turn off your car the log will usually reset back to 0.00. But while you are driving and the Knock comes up and it doesn't reset back to 0.00 in a few or so then you may want to have it checked out. Disclosure, before I had the tune done, my Knock was up and down and really never reset to 0.00. After tuned (Stage 2), I still see the Knock (but only when I am pulling) but it will reset back to 0.00 while I am driving not when the engine is off.

 

You seem to have a misunderstanding of the way the Knock system works on a Subaru.

 

Here is a great post by Merchgod that describes Subaru's knock strategy in detail. This may not apply to the more recent FA20 motors. Merchgod is an ECM guru. He's now one of the principle ECU engineers over at Cobb Tuning (as per my last understanding).

RomRaider • View topic - Subaru's knock control strategy explained

 

I also just noticed 1 misfire count on cylinder 2 and 4 but no CEL was triggered. This is monitored through the BtSsm app which I think might be similar to romraider. If there is no CEL trigger should this be concerning?

 

My I ask -- what Hardware interface are you using?

 

I'm currently using a kkl k line for logging. Once I get up to speed I will be picking up a tactrix op 2.0.