So I tried 14.4 idle, 14.7 cruise. Bumped up the idle to 900 for the time being. Sounds a bit fast but it keeps the map around 57-60 idling. How does one determine the ideal idle afr? Trying to understand why some efi guys are getting very lean idle afr, some in the 15's....while others tune for the low to mid 13's at idle. That's such a broad range. Back with my carb I would get idle about 14.5, but any leaner would cause the motor to die. Best idle afr tended to be in the 13.5 - 13.8 afr. This gave the best off idle tip in quality. Obviously the efi will want to keep itself running, so I find it harder to know where that sweet spot is. It doesn't just stall out like a carb to let me know it's too far.