[crunchymilk55]

first off don't trust the readings unless it's a wideband

at idle, our cars should go back and forth, 14.5 being the middle. This is called the ecu's "closed loop" mode. Look that up if you want more info. Whenever we talk about running 11:1 or similar, we are talking WOT or close. After a certain amount of throttle, the ecu will kick into open loop mode, and that's when we tune. We really don't care about closed loop, that's only when the car is idling or driving around town. Basic fuel compensation will automatically deal with this. The car is cycling back and forth getting readings from the 02 sensor to get the best fuel mileage. In open mode, the 02 sensor doesn't even really read anything, the ecu is calculating what the a/f ratio SHOULD be, it has no way of knowing what it actually is. That is why narrowband 02 gauges are useless.

Let me know if you need any more clarification.