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Message: <blockquote data-quote="rollakid" data-source="post: 1219378" data-attributes="member: 6588">i understand what you say. If altezza's ecu runs the same as 20v 4age's ecu (in term of open loop and close loop operation), then there will be difference if you use an safc.I dunno for sure, since i'm no sifu. But theorically it sounded like this:When operating in close loop, the ecu will check the o2 contain in exhaust gas, then it tune itself, thus making safc useless.then there is the open loop operation in the ecu, which most sifu say if you run without o2 sensor, then safc can be use. So i'm assuming that if o2 sensor not used = ecu running open loop all the time, and then the ecu will run open loop anyway if you full throttle your car. which leads me to belive that one can really see changes in performance when you are heavy on the throttle, not when you drive around town slowly...</blockquote>

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