Hi guys. New mustang owner here. I don't understand the concern with the afr. I was always under the assumption that 14.7:1 is ideal.
14.7:1 is ideal for burning the fuel efficiently but is dangerously lean under high load.
The AFR shown is max, I paused the video where you can still see the AFR graph. It starts around 14.7:1 then drops down out of sight, but it's below 13:1.
2012 Premium V6 Mustang, Candy Red, Performance Package, Manual.
Mods: Steeda Sports, Koni Yellows, Steeda HD Strut Mount, UMI LCA's, UMI Panhard Bar, Energy Suspension Sway Bar Bushings.
Last edited by sj90; 12-21-2014 at 04:47 PM.