Originally Posted by Silver_TransAm

I had to go with a sd tune from Nelson Performance in San Antonio so my cam would idle smoother while in gear and with a/c on. I love the sd tune better than with the MAF, more power and more consistant. Drove it from texas to georgia and back with no problems what so ever, still using the IAT. I would recomend it for anybody with a good size cam on the street and of course it is a must for FI.

Originally Posted by mightyquickz28

Well, I've been battling a alleged lean o2 (drivers side only) for the past few days with my brand new setup. I have a custom turbo specific Bryan Herter PCM for less tune. I bought 2 new O2 sensors today and new plugs, gapped to .035 and installed them. Crap. Same 160 BLM on the drivers side. I think it's the hotside myself. I'd pulled all the plugs last night to look at the 'lean' condition affect on them. Imagine my surprise when these plugs with maybe 20 to 30 minutes of run time looked black, heavily sooted and wet. That's why I thought it might really be a bad O2. So, I used my LT1 edit and changed Bryans Turbo tune to SD and uploaded it. Now it runs so much better. It still seems to be fairly rich. I shut it off then tried to crank it but it was hesitant to start. Did you guys have to do any attendant changes to the overall tune other than just specify it's now to be SD? Also, I've read this thread and wondered, what all is involved in migrating to a 2 Bar or 3 bar?
Thanks!