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Old 12-17-2004, 11:57 AM   #1
ronf
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Member#: 51034
Join Date: Dec 2003
Location: 49 north
Vehicle:
03 WRX, 02Forester
PSM

Default Apexi TT A/F accurate ??

Installed Apexi with only TT function.
Is it worthwhile to tap the ECU for A/F reading ? If yes what pin # to tap for 03 WRX.
searched with different # results.
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Old 12-17-2004, 12:05 PM   #2
Mulder
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Join Date: Oct 2001
Chapter/Region: Tri-State
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15 WRX/05 GTO

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No, they tap the rear 02 which is the only place you can use. Not accurate at all.
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Old 12-17-2004, 12:29 PM   #3
ejh25
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2002 WRX
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Shouldn't it be the front O2. Regardless, the readings you get from either the rear or front O2 sensors are absolutely worthless for tuning. The front O2 sensor is a narrow band O2 sensor. It will only read as rich as 12:1 AFR. Not nearly rich enough to tune high load, high rpm zones. You shouldn't even bother with it. Get a real WBO2.
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Old 12-17-2004, 12:56 PM   #4
Mulder
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15 WRX/05 GTO

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Well the front 02 is not a conventional narrowband, nor is it a full-range wideband. So call it a "semi-wideband". Anyway it does not produce a standard 0-1V signal that can be tapped, so any tap-in type gauge will use the rear 02.
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Old 12-17-2004, 12:59 PM   #5
ejh25
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2002 WRX
Silver

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Thank you for the clarification.
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