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The Terminator
Terminator Talk
New tune, new front 02 sensors, now I have the CEL coming on
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<blockquote data-quote="c6zhombre" data-source="post: 15832623" data-attributes="member: 76381"><p>It will throw a rich code because an 85% tune of ethanol is requiring 30-40% more fuel to maintain a similar lambda a/f ratio at WOT as a gas tune (E10 gas tune stoich is like 14.1/1 and E85 is 9.75/1 or somehwere in that vicinity). So, if you have it tuned for 85% ethanol, it's really throwing a ton of fuel at it because it's expecting a certain ethanol %. Your E10 pump gas tune is requiring a lot less fuel than your E85 tune.</p><p></p><p>This is why it's smart to test every single time. Just in case. It's also not a bad idea to get your tuner to maybe make you an E55-E60 tune just in case you get some super shady winter blend stuff. By law, unfortunately, I believe ethanol can be as low as 53% these days and they still market it as "E85".</p></blockquote><p></p>
[QUOTE="c6zhombre, post: 15832623, member: 76381"] It will throw a rich code because an 85% tune of ethanol is requiring 30-40% more fuel to maintain a similar lambda a/f ratio at WOT as a gas tune (E10 gas tune stoich is like 14.1/1 and E85 is 9.75/1 or somehwere in that vicinity). So, if you have it tuned for 85% ethanol, it's really throwing a ton of fuel at it because it's expecting a certain ethanol %. Your E10 pump gas tune is requiring a lot less fuel than your E85 tune. This is why it's smart to test every single time. Just in case. It's also not a bad idea to get your tuner to maybe make you an E55-E60 tune just in case you get some super shady winter blend stuff. By law, unfortunately, I believe ethanol can be as low as 53% these days and they still market it as "E85". [/QUOTE]
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The Terminator
Terminator Talk
New tune, new front 02 sensors, now I have the CEL coming on
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