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Old 03-25-2005, 04:56 PM   #3
Jon [in CT]
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Member#: 2992
Join Date: Nov 2000
Chapter/Region: NESIC
Location: Connecticut, USA
02 WRX Sedan


It was my impression the K&N Typhoon wouldn't require adjustment. Once you put it on, you could confirm that by observing A/F Learning (also called Long Term Fuel Trim) to insure they're close to zero.

A general approach for a non-standard intake would be to make adjustments to the MAF calibration table such that the target A/F ratios at various loads in your fuel table agree with actual A/F ratios reported by a wideband A/F sensor.
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