Originally Posted by animuL
Well it look slike Russ answered most of your questions, however 12.25-12.5 afr is pretty lean for what most GTP guys run. Most stay in the mid 11 range, 11.4-11.8 for best results. GTPs love to chip pistons so running more on the rich side is a good idea, just never run too rich or you can have problems that way as well. LTFTs are adjusted with the MAF table, and if you use the method that Russ posted, replacing your stock O2 sensor with the wideband, then you should be able to get everything tuned to the proper afr so that once you plug the stock sensor back in, your LTFTs should stay pretty close to 0, if they dont then you could either have a bad O2 sensor or its just that inaccurate, either way trust the wideband over the narrow.