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SVTPerformance's Chain of Restaurants
The Distillery
E85 and non-ported Eaton question
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<blockquote data-quote="HotStart" data-source="post: 10347569" data-attributes="member: 75155"><p>As I said, I never understood the "30% rule" some how becoming a "fact" as it has on many forums. In some of my other posts I've mentioned before that although I think forums like these can be and are great learning tools, they can also work the other way when less than ideal information is passed through. </p><p></p><p>Although E85 requires roughly 50% more fuel than gasoline to achieve a similar lambda target, it is possible (on a case by case scenario) that it could use less.</p><p></p><p>An example of this could possibly be found in any car that uses a good amount more fuel than needed for peak power as a method of thermodynamic cooling. You'll see this a lot with people trying to push the limits of pump gasoline, they end up running very rich mixtures to fend off detonation. With the superior latent vaporization of heat properties of E85 in comparison to straight gasoline, it is possible to rely less on excessive fuel mass for cooling. In scenarios like this, the subject vehicle could end up using less than the estimate of 50% more fuel. Though not anywhere near the extent where you'd only be using 20-30% more fuel. </p><p></p><p>say you were using 93 octane gasoline, at an extensively rich mixture to act as a form of cooling. With this car you target a lambda value of .76, or an A/F ratio of 11.17:1. If you only added 30% more fuel, you would achieve a lambda value of .872 with E85. That is the equivalent to a gasoline A/F ratio of 12.81:1. A pretty significant difference, and one that is not within the realm of fuel no longer needed for cooling. </p><p></p><p>If you really want to hear a well known (and reputable) name say the information (which is fair, especially since I just talked about bad information on forums), then please see the following statements from Justin Starkey of VMP tuning. </p><p></p><p></p><p></p><p></p><p>[ame=http://www.vmptuning.com/forum/showthread.php?t=833]E85 testing on NA 08 Mustang GT 4.6L 3V - VMP Tuning Message Board[/ame]</p></blockquote><p></p>
[QUOTE="HotStart, post: 10347569, member: 75155"] As I said, I never understood the "30% rule" some how becoming a "fact" as it has on many forums. In some of my other posts I've mentioned before that although I think forums like these can be and are great learning tools, they can also work the other way when less than ideal information is passed through. Although E85 requires roughly 50% more fuel than gasoline to achieve a similar lambda target, it is possible (on a case by case scenario) that it could use less. An example of this could possibly be found in any car that uses a good amount more fuel than needed for peak power as a method of thermodynamic cooling. You'll see this a lot with people trying to push the limits of pump gasoline, they end up running very rich mixtures to fend off detonation. With the superior latent vaporization of heat properties of E85 in comparison to straight gasoline, it is possible to rely less on excessive fuel mass for cooling. In scenarios like this, the subject vehicle could end up using less than the estimate of 50% more fuel. Though not anywhere near the extent where you'd only be using 20-30% more fuel. say you were using 93 octane gasoline, at an extensively rich mixture to act as a form of cooling. With this car you target a lambda value of .76, or an A/F ratio of 11.17:1. If you only added 30% more fuel, you would achieve a lambda value of .872 with E85. That is the equivalent to a gasoline A/F ratio of 12.81:1. A pretty significant difference, and one that is not within the realm of fuel no longer needed for cooling. If you really want to hear a well known (and reputable) name say the information (which is fair, especially since I just talked about bad information on forums), then please see the following statements from Justin Starkey of VMP tuning. [ame=http://www.vmptuning.com/forum/showthread.php?t=833]E85 testing on NA 08 Mustang GT 4.6L 3V - VMP Tuning Message Board[/ame] [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Distillery
E85 and non-ported Eaton question
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