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Old 08-08-2001, 11:54 AM   #1
yebokmj
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Location: Raymond, NH USA
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Default A/F gauge question

I have all Greddy gauges and now need to pickup an A/F fuel guage. The Greddy A/F gauge comes with it's own O2 sensor that is supposed to be able to read over a larger range. My question is do I replace one of the factory O2 with theirs and splice the factory wiring into it? Or should I just have another bung added for their O2 sensor. Also I would think that the O2 should be put either in the place of the second O2 furthest from the turbo or right next to that if I put a new bung in.
Joshua
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Old 08-08-2001, 12:08 PM   #2
jeffg
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I would install the O2 sensor in a new bung. If you change out the factory one, there is a chance that you will not have a similar enough O2 sensor to work with the factory ECU. You might hurt the ECU.

Anyway, placement of the AF guage on a turbo car is a bit tricky. Part of me wants to say install it before the turbo, in case the turbo somehow changes the oxygen content, but then I cant figure out how it would do that.


Hmm...

Jeff
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Old 08-08-2001, 02:22 PM   #3
the Dabbler
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I would second Jeff's opinion on not replacing the factory O2 sensor. If the Greddy sensor is wide-band, as your post implies, then the ECU will certainly be confused and possibly damaged by it (the OEM rear O2 sensor is 0-1V).

I don't really have a good opinion on the placement of a new bung. Just off the top of my head, I would think before the cat would be better, as the cat is changing the chemical composition of the exhaust gas, but then again, I believe the high-accuracy O2 bench meters typically just sit in the tailpipe (i.e., after the cat). So maybe it doesn't matter.
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Old 08-08-2001, 03:21 PM   #4
jeffg
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I am certain you would want it before the cat, which is why if you cant use the factory o2 sensor. On a turbo car, I think the question is, does a turbo affect AF ratio?
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Old 08-08-2001, 03:36 PM   #5
the Dabbler
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As you mentioned earlier, I don't see how the turbo itself could affect the O2 content. But then again, I'm not a mechanical/chemical engineer.

Are you thinking maybe the O2 is combining with something else in the heat, and being left deposited in/on the turbo (and therefore, not being seen as gas past it)? Seems like any scenario like that wouldn't result in drastically different readings anyway, though.

:Shrug: Hey, shouldn't there be a "shrug" smilie?
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