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10-24-2011, 06:26 PM
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#19 |
 Drives: 1nz-fe Join Date: Apr 2009
Location: SoCal
Posts: 4
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ECU will learn by how much to offset MAF sensor readings that are affected by different intake runner diameter. The Long Term Fuel Trim value will eventually be in the plus territory since ECU will assume that MAF does not measure as much air as is actually entering the motor.
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10-24-2011, 07:50 PM
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#20 |
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1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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So you have data to back up your claim?
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10-24-2011, 08:53 PM
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#21 |
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Drives: 1nz-fe Join Date: Apr 2009
Location: SoCal
Posts: 4
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Scangauge can display LTFT value. I have one and clearly saw difference between running stock intake and AEM (i have 2006 xB)
AEM intake is slightly smaller diameter than stock runner which makes the MAF readings be higher than what they should be. So my ECU learned to run -5 to -7 Long Term Fuel Trim once it's off idle. With stock intake before it usually ran between +2 and 0. Last edited by Reactor; 10-25-2011 at 01:04 PM. |
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