Originally Posted by
RobZL1
There is a large list of things to consider when going FI on an originally NA setup. There are many variables depending on your setup.
In very general terms, you are correct that a FI setup will want less timing than the same motor when it was NA. You will also want to run it richer than NA in PE. On an LS3, you might run 0.85 lambda when NA, but you'll want 0.78-0.80 once it's FI.
There are many factors to consider, though, both in the physical build and in the calibration, and they are interrelated.