Quote Originally Posted by dave w View Post
Verify the O2 sensor is working correctly by looking at the voltage swings in the "Monitors" screen of TunerPro RT. If the O2 sensor is working correctly, then increase the injector flow another 4 lbs. It seems unlikely the injector flow would be greater than 86 lbs.

The idle SA is somewhat concerning, swings of a few degrees is normal. Idle SA swings of 10 or more degrees is concerning.

dave w
Thank you, Dave. From what I know about the NBO2, it looks like it's working normally by watching the monitor. Pretty regular swings from 100 to 900 mV. It does plateau low or high for a few seconds at times, but then starts swinging again. I'm going to bump up flow rate to 82 lbs and see what happens.

As for SA, I also plotted that on the monitor and it looks more normal there. Previously I was just watching it on the analog gauge in TP dashboard. At the end of the drive I let it idle for several minutes in closed loop and the SA stayed pretty close to 17-18, with swings of a degree or two either way, but very consistent. It did bounce around quite a bit more if I rev'd it, but I think that's expected. I also noticed that SA was very large (40-41) on cold start up and linearly decreased as engine warmed. Weird?