Originally Posted by Joshboody

Actually I think what tblu is referring to is tuning <1.0 lambda using NB… wording is just confusing. You can tune non-1.0 setpoints without a WB though, although its not easy. Basically once you dial in your trims, you have a bunch of flexibility and can use the NB to make sure you’re on the correct side of lambda… actually NBs can read variations of lambda, BUT you need to have an initial reference point like a WB (so would kinda defeat the purpose). But WB isn’t necessary if you get creative… for example taking NB voltages at various AFR setpoints in the OL table (with a close to 0 trim tune). Once you have a baseline you can use at WOT. Anyway all this is unnecessary when you can just use a WB.

I was thinking about this for an E85 tune targeting lean P/T setpoints, but it could be a hassle with weather changes… although so far cooler air hasn’t effected my trims much at all. In theory it should not, but I’ve read that LSx trims do change with weather.