Its neat the way Dave did the AF logging stuff- if your using a RTv2 you can use an analog input (done for the B13, not for the B14), or if your using anything else you can feed the wideband output to your stock (front) O2 sensor input. the stock O2 input voltage range is 0-2.5V, so if your using an innovate you just adjust the output to 0-2.5V, linear. Any other brand that does a 0-5V linear output you use a simple voltage divider (two 5 cent resistors) to downscale it to 0-2.5V. In the tunercode bin there is an option to use a linear signal (as opposed to the stock narrow band), just turn that on. It automatically converts the linear signal to narrowband for the normal ECU operation and logs your translated AFR.

The option to use a wide band O2 sensor for closed loop tuning will be in the second release of TunerCode. It is still under development, but you will be able to set the wide band voltage (AFR) where you want the center point, and also shape the narrow band curve.

Dave