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After going through the basic setup and installation, Macy got into more tuning fundamentals, such as the air/fuel ratio landscape. The idea here is that there is an ideal-or stoichiometric-ratio where all the fuel molecules pair up with oxygen molecules at 14.7:1 (14.7 parts air, one part fuel). That's great for emissions and mileage, since hydrocarbons, carbon monoxide, and nitrogen oxides are at their lowest points at that ratio, but as the chart demonstrates it's not ideal for loads, high rpm, or boosted conditions. View Related Article
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