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Message: <blockquote data-quote="speed2horizon" data-source="post: 1063350750" data-attributes="member: 30831">Basically, I'm not too sure at what RPM and TPS does the close loop stop working... Most stop working for TPS>40% and RPM3500 whichever comes first.But with the stock O2 sensor, I doubt it can do much. The O2 sensor can't even give AFR reading. It can only gives Air Fuel condition. So, the signal is either Lean/Stochiometric/Rich. No actual reading.If we plonk in a O2 meter to the narrowband, the reading achieved is just an average formulated figure by the Meter. It's inacurate.I would say it's the limit of the hardwre on the engine itself. Like NA MAP SENSOR won't read anything +'ve by right. That's why piggyback are meant to cheat them. Regarding the autocorrection, there are a a mappings in the ECU that reacts according to the AIT Sensor, Coolant temperature etc etc. It's not actually correction. But it's more of a preset map. Example when knock detected, the ignition will retard. But the retard will not be up to safe figure. But it's preset how much to retard from factory. This may not be entirely true for all car/enging/make. But at least that's what I know off... If u extract the bin file from the ECU chip, u'll see all those maps.EMU is something like HKS FCON, ApexI Power FC and other advance piggy. It only uses part of the maps in our ECU and bypass another half... Like ignition map/afr map are all self define. That explain why EMU can increse REV limit and EMB can't because Fuel Map and ignition map of EMU is based on the standard map in ECU and EMU Fuel/Ignition map stand by itself.Sorry for not being able to answer it in more detail, as that's all I know off. For more details and deep question, I'm still learning.</blockquote>

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