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Bear in mind that if you have a "perfect" 14.7:1 a.f.r. at cruise, you'll probably have a few lean and rich cylinders somewhere. I got to the high 13's at cruise and called it good enough. I have my o2 sensor mounted 12" from the turbine outlet, so I know all the exhaust is thoroughly mixed by then.



If you are running 10% ethanol pump gas your ideal AFR is 14.1 to 1.



Thanks for posting that chart. I recently decided to just suck it up and start putting the 10% ethanol in my car. The 100% gas is hard to find and around here they are asking as much at .25-.40 more per gallon for it. I have some jetting to do.

68 Barracuda Formula S 340