I have a 05 GTO with a ported TB and intake manifold. Axle back mufflers. Stock everything else. I have HPtuners standard. The fueling and spark side of the tune is 100% stock. I did a light tune on the VE table using LTFTs a few weeks ago. No MAF tuning yet. Innovate LC-2.
Now Since my exhaust is all stock, I put the wideband sensor in the bank 1 rear O2 bung. So it is after the cat. Readings at idle and cruise and close to stoich (14.7). They usually sit somewhere around 14.8 at idle and cruise. I did calibrate the sensor in free air (not in exhaust) twice per the innovate instructions.
I went out to log a few quick pulls and my AFR at WOT seems a bit off. It was in the 13.5-13.8 range at WOT. Now I didnt get to make many pulls because I was short on time so I need to get out there and do some more logging.
I verified the AFR by the gauge in the car, and I logged it via HPTuners through the serial port using the built channel and transform settings.
Is this right? 13.5 seems pretty lean at WOT for a stock tune. For those of you without access to HPtuners I am attaching a picture of my stock PE table. Commanded AFR should be around 11.5-12.5.
Attached my logs and tune.