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SVTPerformance's Chain of Restaurants
The Distillery
Whipple 3.4 E-70 Dyno Results
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<blockquote data-quote="BruceH" data-source="post: 10565088" data-attributes="member: 106410"><p>First off I'm not a tuner, but I adjust the tunes for my car with prp and understand the basics of engine management. </p><p></p><p>My car was originally tuned with an 80% ethanol content. The stoich for that is 10.2. When and if summer blend comes out in my area the first clue will be short term fuel trims will go positive in closed loop (adding fuel to get lambda as measured by the o2 sensors). Once I test and verify the content is 85% ethanol I'll just load a tune with 9.8 for stoich, keeping everything else the same. That way the commanded af will still be right on and the fuel trims can stay as close to 0 as possible. Like I said I'm not a tuner but I don't see how he could of gotten the maf transfer correct by using one fuel and guesstimating a future fuel, unless he had already tuned it on a different fuel and had the maf transfer values.</p><p></p><p>He could of sent you home with 9.8, 10.2, and 10.7 stoich tunes for the different blends of E 85 you are likely to encounter or sent them in mako files.</p><p></p><p>By any chance do you monitor your short and long term fuel trims? I'd be curious to see where they are.</p><p></p><p>There are professional tuners on this site. If I have something wrong please correct me because this is the approach I'm using for my motor.</p></blockquote><p></p>
[QUOTE="BruceH, post: 10565088, member: 106410"] First off I'm not a tuner, but I adjust the tunes for my car with prp and understand the basics of engine management. My car was originally tuned with an 80% ethanol content. The stoich for that is 10.2. When and if summer blend comes out in my area the first clue will be short term fuel trims will go positive in closed loop (adding fuel to get lambda as measured by the o2 sensors). Once I test and verify the content is 85% ethanol I'll just load a tune with 9.8 for stoich, keeping everything else the same. That way the commanded af will still be right on and the fuel trims can stay as close to 0 as possible. Like I said I'm not a tuner but I don't see how he could of gotten the maf transfer correct by using one fuel and guesstimating a future fuel, unless he had already tuned it on a different fuel and had the maf transfer values. He could of sent you home with 9.8, 10.2, and 10.7 stoich tunes for the different blends of E 85 you are likely to encounter or sent them in mako files. By any chance do you monitor your short and long term fuel trims? I'd be curious to see where they are. There are professional tuners on this site. If I have something wrong please correct me because this is the approach I'm using for my motor. [/QUOTE]
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Whipple 3.4 E-70 Dyno Results
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