I have a 2005 cobalt ss/sc that I bought last fall. The car was modified when I bought it. I went over it to see what was all done. I found it has a zzp 2.8 pully, long tube header and full three inch stainless exhaust no Cat. It also has an injen CIA, 60lb injectors, and thee added zzp heat exchanger. I am new to tuning but have been reading up on the basics so bare with me. I have a AEM wideband and a aeromotive scan gauge to keep an eye on my vitals.
My concern is that I took it out the last week or so and it seemed a little off. So I checked my IAT2 tems and they are not perfect but seem to be in check. About 95 deg during cruising on a 80 deg day. I plan on addressing that later. What I did notice is that my ltft is between +15 to +20. that seemed a little high to me. I also noticed that under WOT that my AFR is around 11 to 10.9. I have a ZZP tune done to match all my mods but it seems off. I will be purchasing the HPtuners software in the next few weeks. For now I know there is not much you may be able to tell me until I can pull some logs. Any ideas would be a great. I didn't realy notice it much in the winter monthes. could it be the mouse piss for fuel they sell around here. LOL I live in central PA. help.