A/F ratio

Originally Posted by Jordo!

What are your mods?

You can almost definitely leave things alone, at least based on those brief snapshots, but you can probably milk more power and improve driveabilty over stock with a tune.

You might also data log Long term fuel trims to see how much correction the ECU is applying. If you can log two parameters (say, load or MAF voltage along with LTFT's or AFR) it will be easier to see if there's someplace with room for improvement. Another good variable to log is ignition timing.

You always want to have a load reference point (you sort of did that informally by noting "idle", vs "low load to WOT" vs "tip-in" vs "throttle lift"). You could also use TPS to scale, but load or MAF voltage will be better.

If you have only a catback and OEM airbox with high flow filters and/or smooth tubes, you should have very nominal trims. If you have a CAI, or anything that replaces the cat, it's a bit more hit and miss.