A local competitor shop thinks that tuning a car anything leaner then 10.5 is bad. I have had several of his cars come in and they are 10.5 or richer under full throttle. I have retuned these cars at 12.0 to 12.5 and he swears this is way to lean and I am going to blow them up. I even dynoed my bone stock 2010 Camaro and it was 12.8:1 at full throttle. But he still thinks I am leaning these cars out to much.
What AFR's do you guys tune to?