Where to tap downpipe for o2?

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Old Aug 9, 2002 | 08:08 AM
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Default Where to tap downpipe for o2?

Should I go right after the turbo, or will that be too hot for the sensor?

P.S. I'm going to get my downpipe made as soon as I can, today!


[Modified by ion_four, 5:11 PM 8/9/2002]
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Old Aug 9, 2002 | 08:14 AM
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Default Re: Where to tap downpipe for o2? (ion_four)

i know the drag DPs are tapped about 3" from the very end where it connects to your cat/testpipe/exhaust
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Old Aug 9, 2002 | 08:22 AM
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Default Re: Where to tap downpipe for o2? (KC GSR)

wow, that's pretty far down...the only thing I could find in a search was someone saying they went 6" from the turbine outlet...hrm...
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Old Aug 9, 2002 | 08:27 AM
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Default Re: Where to tap downpipe for o2? (ion_four)

what type of 02? stock, greddy, wideband?
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Old Aug 9, 2002 | 08:29 AM
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Default Re: Where to tap downpipe for o2? (ion_four)

I think that was my post. Mine is 3", not 6" from the turbine. BUT my sensor is not heated. If you have a heated sensor, 4 wire, it should be further away, close to the cat.
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Old Aug 9, 2002 | 08:34 AM
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Default Re: Where to tap downpipe for o2? (Doodoo)

It is a 4-wire heated Denso stock sensor.
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Old Aug 9, 2002 | 10:49 AM
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Default Re: Where to tap downpipe for o2? (ion_four)

if its a stock sensor, then put it in the stock location....right before the cat.
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Old Aug 9, 2002 | 10:52 AM
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Default Re: Where to tap downpipe for o2? (00SilverLS)

Put it close to the turbo, heated or not.
The only reason the stock o2 sensor is by the cat is because its right after the 2-1 merge.
That way its allowed to read all 4 cylinders and not just 1 or 2.
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Old Aug 9, 2002 | 12:09 PM
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Default Re: Where to tap downpipe for o2? (sgT)

Put it close to the turbo, heated or not.
The only reason the stock o2 sensor is by the cat is because its right after the 2-1 merge.
That way its allowed to read all 4 cylinders and not just 1 or 2.
Steve, does this rule apply for a wideband o2 also?
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Old Aug 9, 2002 | 02:07 PM
  #10  
filetofit
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Default Re: Where to tap downpipe for o2? (racerxadam)

Put it close to the turbo, heated or not.
The only reason the stock o2 sensor is by the cat is because its right after the 2-1 merge.
That way its allowed to read all 4 cylinders and not just 1 or 2.


Steve, does this rule apply for a wideband o2 also?
I wanna know too.
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Old Aug 9, 2002 | 03:53 PM
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Default Re: Where to tap downpipe for o2? (racerxadam)

no. because a wide band can account for variations in temperature.

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Old Aug 9, 2002 | 03:56 PM
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Default Re: Where to tap downpipe for o2? (sgT)

off topic:

I've always wondered how tailpipe wideband O2 sensors can be accurate on cars with catalysts still installed.

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Old Aug 9, 2002 | 04:14 PM
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Default Re: Where to tap downpipe for o2? (dustin)

I was told you need a testpipe or hollowed cat for an accurate wideband! Hmmmm.
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