An air-fuel ratio chart demonstrating how different mixtures affect engine performance and vehicle emissions. In a perfect world, all gasoline engines would run the ideal air-fuel mixture of 14.7 parts air to 1 part fuel. This target mixture, which is referred to as the stoichiometric air-fuel ratio, is a compromise between optimum fuel economy
The base fuel map has the greatest influence on the air/fuel (A/F) mixtures. With injection time tuning, you will be adjusting injection times to calibrate against the efficiency of the engine as well as tuning for a desired Air Fuel Ratio (AFR).
The LambdaKing from RaytechAutomotive is a workshop tool for measuring the oxygen content of exhaust gasses, to enable fine-tuning of the air to fuel ratio (AFR). Featuring the latest LSU 4.9 technology wideband sensor, the LambdaKing is accurate, easy to use and an incredibly economical option for both the professional tuning workshop and the
**Tuning Tip** Since alcohol is a fuel, when using mixes with higher percentages of alcohol, expect air/fuel ratio to richen up more then when used with mixes containing lesser percentages of alcohol with greater percentages of water. For this reason, many user’s will actually prefer using a much lower percentage of water/alcohol or 100% water.
All you do is divide commanded AFR by stoich. 12.2/14.1 = .865 Lambda. Essentially you will need to use the value the ECU is reading for Stoich to do this math for any other fuel blends other than E10. But if you were running E10 and Lambda was reading .80 then your AFR is 14.1 x .80 = 11.28:1.
Simply put, an air-to-fuel ratio is the measure of air compared to fuel involved in the combustion process. For safety reasons, knowing what the air-to-fuel ratio curve is on your burner system is
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how to tune air fuel ratio
