Thanks, I didn't have that web site. It's nice to know.
After a few weeks I was able to get in touch with a guy at Accel that I used to know that once worked as a technician at Accel. He gave me an injector offset number of: 0.787.
Well, the GEN7+ software entry only accepts 0.78 or 0.79. So I changed from my Siemens high impedance 55 injectors to the Accel low impedance 72 injectors and tried both 0.78 and 0.79 injector offset numbers. Both numbers work about the same. No detectable difference from the way the car used to run. My idle quality is about the same as far as I can tell - which still needs a lot of work. But I guess we can call this a success story as far as getting the injector offset about right. Thanks for the help and following along.
The next thing that I have to do is upgrade the fuel pump. I'm following the Aeromotive HP 340 pump thread, but can anybody tell me the correct pump offset needed for the TTA? In other words, are the TurboBuick and Turbo Trans Am pump offsets different (center or offset left or offset right)?
Best, Bob