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We'll chime in here and it is being also followed up with email. The original tune from prior was dead smooth AFR/boost curves and IAM generally at 1, with next to no knock. The turbo was changed and now the datalog that I just looked at looks totally different. We'll have to get to the bottom of this to figure out exactly what's up, but I'd guess we may be seeing some hotter air.
In regards to full time closed loop, we disagree with some of the other voices here regarding that application on the BRZ/FR-S. While some OEMs may use a similar type of strategy, they have failsafes built in that this ECU does not. So if the sensor drifts your AFR will also and you'll never know it. Frankly it is a easier way to tune in bulk since you just let the custom map set the AFR, but the easier way is not always the best way. It is indeed much harder to set the correct MAF scaling and temp compensations manually. Also we leave 6 additional custom maps open when we leave that feature out, which enables us to implement the custom TC, flex fuel support, electronic boost control, smooth rev limit, etc...
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