I did some baseline runs after my rebuild at 10psi. How do these look? Am i running to lean or to rich? The shifts points are marked for reference.

Is higher the number on the O2 lean or rich?

the higher the voltage , the more rich you are.

.86 is a lean reading for a narrowband under boost. You want ~.94-.96

In the first run, looks like air/fuel is lean. Optimal is .87-.89V, and timing is pretty good. The second run looks better, but O2 shows you're running quite rich and the timing is also good. Some people try to target timing at 18 degrees. Did you do anything different between runs one and two? Just curious about the difference in values.

Originally posted by fly1
In the first run, looks like air/fuel is lean. Optimal is .87-.89V, and timing is pretty good. The second run looks better, but O2 shows you're running quite rich and the timing is also good. Some people try to target timing at 18 degrees. Did you do anything different between runs one and two? Just curious about the difference in values.

First graph is shifting from 2nd to 3rd at 6800RPM's and the second graph is 3rd to 4th at 6800RPM's

It looks like you're just a hair lean and pulling back a small amount of timing. You should see 19-21* advance normally, and about .92 - .94 on your stock O2 sensor.