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SVTPerformance's Chain of Restaurants
Tuning À la carte
Dataloggin STFT and LTFT
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<blockquote data-quote="encasedmetal" data-source="post: 12079303" data-attributes="member: 80137"><p>no. not to be rude but did you read through the thread and understand what stft readings are?</p><p>think of stft as an afr gauge (which they are, but narrowband, not wideband) and imagine that 1.0 is stoich (14.64 for unleaded gasoline). anything less than that (0.90 for example) is rich, just like 12.0 afr is less than 14.64 afr and is rich. anything over 1.0 and it's lean. hope that helps you visualize it. before you tune using stft I suggest you disconnect the battery, bring the car to temp and see what it's reading. over time the stft become the ltft and start over. this isn't changing your tune, it's changing the way your car runs while your driving. SO- to your original question, if your stft reading is 0.90 at 165 maf ad counts, and on your maf xfer table you have 155, and then 196 (just examples btw). you would multiply the 196 cell value by 1.0/0.90=1.1 bacause you are adding more air into the maf table to lean it out since you are getting readings of rich conditions. not adding fuel.</p></blockquote><p></p>
[QUOTE="encasedmetal, post: 12079303, member: 80137"] no. not to be rude but did you read through the thread and understand what stft readings are? think of stft as an afr gauge (which they are, but narrowband, not wideband) and imagine that 1.0 is stoich (14.64 for unleaded gasoline). anything less than that (0.90 for example) is rich, just like 12.0 afr is less than 14.64 afr and is rich. anything over 1.0 and it's lean. hope that helps you visualize it. before you tune using stft I suggest you disconnect the battery, bring the car to temp and see what it's reading. over time the stft become the ltft and start over. this isn't changing your tune, it's changing the way your car runs while your driving. SO- to your original question, if your stft reading is 0.90 at 165 maf ad counts, and on your maf xfer table you have 155, and then 196 (just examples btw). you would multiply the 196 cell value by 1.0/0.90=1.1 bacause you are adding more air into the maf table to lean it out since you are getting readings of rich conditions. not adding fuel. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
Dataloggin STFT and LTFT
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