Quote:
Originally Posted by arghx7
I just saw your update.
To make a long story short, there's a very good chance those A & B closed loop targets are there for emissions purposes. Basically, you have to offset the target AFR based on feedback from the rear O2 sensor. The two maps may be a feedforward portion of the calculation, and then the rear o2 compensation is on top of that. A lot of it has to do with the fact that the front O2 sensor is a wideband and the rear o2 sensor is a narrowband.
So the two maps are probably for the catalyst oxygen storage capacity control and NOx emissions countermeasure. The maps are set You probably don't have access to the oxygen storage capacity controls with BRZedit (or ECUTek for that matter), but trust me they're in the ECU somewhere. If the target AFR isn't set right, the engine will fail NOx on the LA4/FTP test cycle.
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Yeah, that makes a lot of sense. I remember the 32bit wrx ecu's would go a couple decimal points richer if you removed the rear 02 even if you patched the rom to turn off the CEL.
I know you can log catalyst temperature, even though i assume it is a calculated value. I assume they are looking at the out put of both 02 sensors to determine cat temp and then adjusting target afr based on the desired temp. I guess thats my version of what your saying lol.