As we know, the IVT calculations go out of whack when you scale the stoich/IFR (to get around the IFR limitation). I can't wonder if there are long term consequences of doing this, such as potentially killing the O2 sensors.
So has anyone done this long term to see what may happen, other than me? I have a bone stock '08 C6 A6. I took the stock file and doubled stoich and halved my IFR, then adjusted the fuel scalar (for my DIC calculations). After many months of running it like this (and over 10k miles - I drive the car over 800 miles a week for school), my car stated idling funny at times, and became progressively worse. I scanned and found that my O2s were bombing out, but NO codes whatsoever (odd). STFTs and LTFTs would be severe negative (-25% and -20% respectively). The funny idle quirk was them resetting back to 0 every 15 or so seconds. I put the stock tune back in and exact same thing, which told me more than likely the O2s were toast. I installed two brand new factory ones and now they are within +/- 3% at all areas.
But here's the kicker, the car was still getting normal economy even with the old O2s like this. I was averaging 28-31mpg before the new O2s and the same after the new O2s. The only difference is that my fuel trims are normal again. Apparently there was some sort of learning going on.
Thoughts?