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SVTPerformance's Chain of Restaurants
The Distillery
Mail-in Ethanol blend testing?
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<blockquote data-quote="gt347mustang" data-source="post: 16534377" data-attributes="member: 44328"><p>I dont have a single link or anything that would tell you everything you need to know but i suggest reading some papers on here:</p><p></p><p><a href="https://worldwidescience.org/topicpages/s/spark-ignition+engines+limit.html#" target="_blank">spark-ignition engines limit: Topics by WorldWideScience.org</a></p><p></p><p>There are several topics that describe the effects of ethanol blends in different types of spark ignition engines, some even give mon/ron ratings.</p><p></p><p>My suggestion is also based on reviewing thousands of datalogs, hundreds of dyno runs and reading/listening to others with more knowledge than myself on this topic.</p><p></p><p>My suggestion still stands. Dyno tune your vehicle on the e5x pump fuel and dyno it again on the e8x fuel. My guess is the car will take the same amount of timing and the difference in power will be a result of the added volume and slighter better cooling with the extra ethanol. I expect 3% or less gains in power if using the same a/f ratio and timing.</p><p></p><p>I realize you're fixated on the fact that the base fuel of the e5x fuel is probably very low octane but in your scenario it doesn't really matter because the ethanol will bring the anti-knock properties past the point where you need it. It will hit MBT before its knock limited.</p><p></p><p>On a max effort setup I agree that the more ethanol the better, but you're at a point where you dont even have a supercharger, so i think you're getting ahead of yourself trying to determine if your e5x fuel is 95 octane or 97 octane.</p></blockquote><p></p>
[QUOTE="gt347mustang, post: 16534377, member: 44328"] I dont have a single link or anything that would tell you everything you need to know but i suggest reading some papers on here: [URL="https://worldwidescience.org/topicpages/s/spark-ignition+engines+limit.html#"]spark-ignition engines limit: Topics by WorldWideScience.org[/URL] There are several topics that describe the effects of ethanol blends in different types of spark ignition engines, some even give mon/ron ratings. My suggestion is also based on reviewing thousands of datalogs, hundreds of dyno runs and reading/listening to others with more knowledge than myself on this topic. My suggestion still stands. Dyno tune your vehicle on the e5x pump fuel and dyno it again on the e8x fuel. My guess is the car will take the same amount of timing and the difference in power will be a result of the added volume and slighter better cooling with the extra ethanol. I expect 3% or less gains in power if using the same a/f ratio and timing. I realize you're fixated on the fact that the base fuel of the e5x fuel is probably very low octane but in your scenario it doesn't really matter because the ethanol will bring the anti-knock properties past the point where you need it. It will hit MBT before its knock limited. On a max effort setup I agree that the more ethanol the better, but you're at a point where you dont even have a supercharger, so i think you're getting ahead of yourself trying to determine if your e5x fuel is 95 octane or 97 octane. [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Distillery
Mail-in Ethanol blend testing?
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