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SVTPerformance's Chain of Restaurants
The Distillery
now that I'm drinking the kool-aid, monitoring tips
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<blockquote data-quote="BruceH" data-source="post: 10566851" data-attributes="member: 106410"><p>More than likely the 9.8 was stoich. That's the air fuel ratio needed pre combustion to obtain lambda post combustion. Post combustion lambda of 1 is always about 14.7 on a gas scale no matter what the fuel. </p><p></p><p>It's quite possible he tuned your car at 10.8 stoich and sent you home with a 9.8 stoich tune in anticipation of summer blend. Your car would only know the difference during open loop (wot) and all that would happen is it would be rich with E70. </p><p></p><p>The best way (imo) short of testing the fuel at every fill up is to monitor fuel trims in closed loop, they will increase when the blend contains more ethanol because the fuel stoich has changed and the ecu will add more fuel to get post combustion a/f correct.</p></blockquote><p></p>
[QUOTE="BruceH, post: 10566851, member: 106410"] More than likely the 9.8 was stoich. That's the air fuel ratio needed pre combustion to obtain lambda post combustion. Post combustion lambda of 1 is always about 14.7 on a gas scale no matter what the fuel. It's quite possible he tuned your car at 10.8 stoich and sent you home with a 9.8 stoich tune in anticipation of summer blend. Your car would only know the difference during open loop (wot) and all that would happen is it would be rich with E70. The best way (imo) short of testing the fuel at every fill up is to monitor fuel trims in closed loop, they will increase when the blend contains more ethanol because the fuel stoich has changed and the ecu will add more fuel to get post combustion a/f correct. [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Distillery
now that I'm drinking the kool-aid, monitoring tips
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