Now I can monitor and data log my A/F ratio, as an additional tuning tool to whip my Promax modded Holley 2bbl carbs into shape. I've heard about the outboard carbs tip in lean spike, but now I've seen it. A/F ratio goes from 13:1 to 20:1 for about 1 second, then back to a more appropriate range. Good to know, especially if you added a nitrous system. In this case a 1 second delay after WOT would make sense. Don't want to spray at 20:1 !