how lean is too lean on a mild n/a setup?? i know for turbo an air fuel ratio of 12.6 is the edge of detonation and high 11's is a relatively safe \, good tune. but what about naturally aspirated setups. 14.7 is considered stoich but i dont see how maintaing that a/f ratio would gain you any power. any input would be appreciated. thanx

 

13:1 is ideal for an A/F curve.