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Below is a graph showing narrow-band oxygen sensor voltage output vs. air/fuel ratio. So the question is, what does a narrow-band oxygen sensor tell you? It is a great tool for determining if your engine is running at 14.7:1. It can provide you with some limited information about how rich your car is running. For heavy throttle applications with a n/a rotary engine its voltage output appears to be sufficient to perform rudimentary tunning. (Note: This graph does not indicate that your air/fuel gauge provides this level of resolution. The sensor itself will have uncertainties - a certain amount of inaccurate variance, and the gauge will add further variance.) For turbo cars it would likley be difficult to acheive useful tunning under heavy throttle. Some people like to tune their cars for very lean ratios for cruising to acheive supperior fuel economy. This practice raises exhaust gas temperatures and I do not have the expertise to indicate what temperatures are acceptable without causing premature damage to turbos and exhaust components. Regardless, the ability to tune "lean" a/f ratios beyond 14.7:1 is very limited. |
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