02 sensor voltage pre/post for catless DP

Does any have 02 sensor voltage logs. I logged my car ( Cobb stage 2+ 335i) with no load and cycled through the RPM slowly and got some strange results. It my understanding that the more positive the value the richer the mixture so maybe I need to be corrected. These logs show that as my pre cat sensor get rich while my post cat sensor goes almost to 0 (lean). It is not the case through the whole logs but it no easy to understand what is normal. The 02 sensor have been checked that they are installed corrected and plugged in the correct mating connector. The car runs normal but does suffer form fast osculating positive LTFT.

If any one can post there 02 voltage for pre/post cats or comment it would be appreciated.


http://www.datazap.me/u/orb/335i-cob...0&data=1-2-3-4