Fellow Calibrators: So, there was a discussion over on the Factory Five 818 Forum and one of the builders posted this graph of a stock WRX (2.0L) motor on the dyno (installed in an 818). Graph shows boost and AFR. The poster commented that WRXs always run lean stock, which tipped me of that something was amiss. Take a look at the graph. AFR is the dotted line with scale on the right. I don’t think it would even be possible to do a pull that lean, especially when it shows >16:1 for the first half of the pull. This is in CO at altitude (5k), but that should not make a difference to the sensor. Am I missing something? I would assume the sensor/dyno calibration is just off.