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The BMW Range
3 Series
E90, E91, E92, E93
V-Power - Hmmmm.....
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<blockquote data-quote="turbology" data-source="post: 322208" data-attributes="member: 10223"><p>How ECU adapt to fuel quality ?</p><p>ECU can adjust your timing map according to you fuel by detect knock value recorded by knock sensor. Most ECU (or DME) recheck/re-read the data everytime you start the car.</p><p><strong>Octane rating has nothing to do with fuel quality</strong>. As you said, Octane rating is merely a value for knock resistance.</p><p></p><p>Higher octance rating <strong>doesn't</strong> mean better fuel economy too.</p><p>E85 has as high as Octane Rating (R+M)/2 of 105, but you get 30% less mileage compare to regular gas.</p></blockquote><p></p>
[QUOTE="turbology, post: 322208, member: 10223"] How ECU adapt to fuel quality ? ECU can adjust your timing map according to you fuel by detect knock value recorded by knock sensor. Most ECU (or DME) recheck/re-read the data everytime you start the car. [B]Octane rating has nothing to do with fuel quality[/B]. As you said, Octane rating is merely a value for knock resistance. Higher octance rating [B]doesn't[/B] mean better fuel economy too. E85 has as high as Octane Rating (R+M)/2 of 105, but you get 30% less mileage compare to regular gas. [/QUOTE]
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The BMW Range
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V-Power - Hmmmm.....
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