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PantsDants · 09-07-2014, 10:34 PM

So on the topic of running lean, I've noticed that every time I hit boost, my AFR consistently reads > 1 point higher than my commanded AFR. I know it's been mentioned that the transition from closed to open loop takes some time, but wouldn't the ECU still be targeting closed loop AFR if it hadn't yet transitioned?

Check out this log to see what I'm talking about: http://datazap.me/u/pantsdants/9-7-t...2058&mark=2020

This is running on 92 octane, OFH + Nameless OP/FP, with the OpenFlash ESC 91 tune.

I plan to have my exhaust checked for leaks when I get my catback installed this week, just to rule out leaking in front of the O2 sensors. Failing that, what would be causing this discrepancy? I'm fairly certain this is contributing to the FLKC you can also see in the log. If it can be attributed to this closed to open loop transition, how do I minimize that? One thing I've already tried is modifying the closed loop AFR compensation tables to target 12.0 in the boost load ranges, but that had zero effect.

Any insight would be appreciated!

09-07-2014, 10:34 PM	#7379
PantsDants Senior Member Join Date: Jul 2013 Drives: Scion FR-S A/T, Whiteout Location: Seattle Posts: 334 Thanks: 57 Thanked 221 Times in 90 Posts Mentioned: 16 Post(s) Tagged: 2 Thread(s)	So on the topic of running lean, I've noticed that every time I hit boost, my AFR consistently reads > 1 point higher than my commanded AFR. I know it's been mentioned that the transition from closed to open loop takes some time, but wouldn't the ECU still be targeting closed loop AFR if it hadn't yet transitioned? Check out this log to see what I'm talking about: http://datazap.me/u/pantsdants/9-7-t...2058&mark=2020 This is running on 92 octane, OFH + Nameless OP/FP, with the OpenFlash ESC 91 tune. I plan to have my exhaust checked for leaks when I get my catback installed this week, just to rule out leaking in front of the O2 sensors. Failing that, what would be causing this discrepancy? I'm fairly certain this is contributing to the FLKC you can also see in the log. If it can be attributed to this closed to open loop transition, how do I minimize that? One thing I've already tried is modifying the closed loop AFR compensation tables to target 12.0 in the boost load ranges, but that had zero effect. Any insight would be appreciated!