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FJR Motorcycle Forums
Technical & Mechanical Problems
Wideband O2 sensor
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<blockquote data-quote="bigjohnsd" data-source="post: 1374079" data-attributes="member: 86475"><p>An A/F ratio of 12.8-12.9 to 1 is close to what is normally accepted as "Rich best Power" and is definitely safe, Lean Best Power is fraught with engine destructive consequences.</p><p></p><p><a href="https://www.turbobygarrett.com/turbobygarrett/airfuel_ratio_tuning_rich_vs_lean" target="_blank">https://www.turbobygarrett.com/turbobygarrett/airfuel_ratio_tuning_rich_vs_lean</a></p><p></p><p>"So what is meant by a rich or lean AFR?</p><p></p><p>A lower AFR number contains less air than the 14.7:1 stoichiometric AFR, therefore it is a richer mixture. Conversely, a higher AFR number contains more air and therefore it is a leaner mixture.</p><p></p><p>For Example:</p><p></p><p>15.0:1 = Lean</p><p></p><p>14.7:1 = Stoichiometric</p><p></p><p>13.0:1 = Rich</p><p></p><p>Leaner AFR results in higher temperatures as the mixture is combusted. Generally, normally-aspirated spark-ignition (SI) gasoline engines produce maximum power just slightly rich of stoichiometric. However, in practice it is kept between 12:1 and 13:1 in order to keep exhaust gas temperatures in check and to account for variances in fuel quality. This is a realistic full-load AFR on a normally-aspirated engine but can be dangerously lean with a highly-boosted engine. "</p></blockquote><p></p>
[QUOTE="bigjohnsd, post: 1374079, member: 86475"] An A/F ratio of 12.8-12.9 to 1 is close to what is normally accepted as "Rich best Power" and is definitely safe, Lean Best Power is fraught with engine destructive consequences. [URL="https://www.turbobygarrett.com/turbobygarrett/airfuel_ratio_tuning_rich_vs_lean"]https://www.turbobygarrett.com/turbobygarrett/airfuel_ratio_tuning_rich_vs_lean[/URL] "So what is meant by a rich or lean AFR? A lower AFR number contains less air than the 14.7:1 stoichiometric AFR, therefore it is a richer mixture. Conversely, a higher AFR number contains more air and therefore it is a leaner mixture. For Example: 15.0:1 = Lean 14.7:1 = Stoichiometric 13.0:1 = Rich Leaner AFR results in higher temperatures as the mixture is combusted. Generally, normally-aspirated spark-ignition (SI) gasoline engines produce maximum power just slightly rich of stoichiometric. However, in practice it is kept between 12:1 and 13:1 in order to keep exhaust gas temperatures in check and to account for variances in fuel quality. This is a realistic full-load AFR on a normally-aspirated engine but can be dangerously lean with a highly-boosted engine. " [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Wideband O2 sensor
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