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SVTPerformance's Chain of Restaurants
The Distillery
Converting to E85?
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<blockquote data-quote="03Steve" data-source="post: 10240540" data-attributes="member: 5016"><p>Well, with a "105 octane rating"...this could benefit those who are interested in lower EGT's (read nitrous/FI guys) to prevent detonation.</p><p></p><p>As far as the tuning side of things go...there is no black magic at all. </p><p></p><p>-You make 9.78:1 your target stioch air/fuel ratio in the EEC.</p><p></p><p>-Same thing with your wideband air/fuel meter.</p><p></p><p>-Apply a 0.668 scale factor for closed loop/driveability conditions as needed in the EEC (bringing stioch from 14.64 to 9.78) </p><p></p><p>-Verify that the EEC's short term fuel trim readings are now centerlined off a 9.78:1 ratio, by referencing the wideband.</p><p></p><p>-Determine a desired WOT air/fuel ratio, use the scale factor with respect to gasoline as a starting point. </p><p></p><p>From there, it's volume. You have more parts ethanol than gasoline in your ratios. About 33.2% more to be exact, when looking at the scale factor. At a quick glance, the costs savings of ethanol vs 105 octane gasoline will be moot, as the ethanol system requires more fuel for regular street driving and for WOT performance. Not to mention the larger fuel system components required to support the ethanol air/fuel ratios.</p></blockquote><p></p>
[QUOTE="03Steve, post: 10240540, member: 5016"] Well, with a "105 octane rating"...this could benefit those who are interested in lower EGT's (read nitrous/FI guys) to prevent detonation. As far as the tuning side of things go...there is no black magic at all. -You make 9.78:1 your target stioch air/fuel ratio in the EEC. -Same thing with your wideband air/fuel meter. -Apply a 0.668 scale factor for closed loop/driveability conditions as needed in the EEC (bringing stioch from 14.64 to 9.78) -Verify that the EEC's short term fuel trim readings are now centerlined off a 9.78:1 ratio, by referencing the wideband. -Determine a desired WOT air/fuel ratio, use the scale factor with respect to gasoline as a starting point. From there, it's volume. You have more parts ethanol than gasoline in your ratios. About 33.2% more to be exact, when looking at the scale factor. At a quick glance, the costs savings of ethanol vs 105 octane gasoline will be moot, as the ethanol system requires more fuel for regular street driving and for WOT performance. Not to mention the larger fuel system components required to support the ethanol air/fuel ratios. [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Distillery
Converting to E85?
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