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Old 01-24-2002, 05:28 PM   #1
Scooby Newbie
Member#: 9797
Join Date: Aug 2001
Location: South Carolina
2005 Honda S2000
New Formula Red

Default A/F Ratio Change Relocation Question???

I am planning to buy a 2 1/16" AutoMeter A/F Ratio gauge, specifically the Carbon faced UltraLight model. I understand that the 2002 WRX has a wide band (0-5 volt) O2 sensor in the front and a short band (0-1 volt) O2 sensor in the rear. I also understand the AutoMeter gauge only works with a short band O2 sensor. I also understand that with a stock exhaust the reading would be more accurate before the front cat than after the rear cat. I am also planning to put a turbo back exhaust and uppipe in the car, from M2 Performance. As well as M2's TMIC. And, I understand the CELs issues with this exhaust mod. I am not planning on buying an EGT gauge. I have several questions, which if you read all of them you may understand where I am going with them.

1. What is the thread size of the EGT bung on most aftermarket uppipes? I am assuming 1/8" NPT or 1/8" BSPT.
2. What is the thread size of the WRX's rear O2 sensor threads? And, will it fit into the bung in most aftermarker uppipes?
3. If I put the uppipe and turbo back exhaust on my car, would the reading at the rear O2 sensor be more accurate than with the stock exhaust? I am guessing yes.
4. Now, lets say I have the uppipe, a turbo back exhaust and a MIL Eliminator capacitor installed on the rear O2 sensor (to stop the CELs). If the A/F gauge is hooked up to the rear O2 sensor, will it effect the A/F Gauge readings? I am guessing NO if the gauge is connected to the wire inbetween the O2 sensor and the capacitors. And, YES if the gauge was connected to the wire inbetween the ECU and the capacitors.

Any suggestions will be welcomed!!!
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