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Old 04-08-2003, 09:53 PM   #1
03mbpREX
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Default advice on how to read A/F guage?

I just installed autometer boost and A/F guage, i know how to read the boost, but kind of confused on how to read the A/F guage, theres lean, and rich, and it jumps back in forth, please give me some insight, thanks alot
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Old 04-08-2003, 10:18 PM   #2
kenshiro
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Default Re: advice on how to read A/F guage?

Quote:
Originally posted by 03mbpREX
I just installed autometer boost and A/F guage, i know how to read the boost, but kind of confused on how to read the A/F guage, theres lean, and rich, and it jumps back in forth, please give me some insight, thanks alot
0-1 volt O2 sensors like our rear sensor are only useful for tuning emissions. They're designed to be accurate only at about a 14:1 A/F ratio. That's the ratio where you get near perfect combustion, so there's no fuel left in the charge. That's not where you tune for power. Basically the only thing it's good for is telling you if you're running super super lean. If you have your foot to the floor and that thing isn't in the green, then you have problems.

If you have cats before the O2 sensor then that things gonna read lean. If that's the case then the thing is completely worthless.

I have one though. It looks nice, I guess that's the only practical use for it.
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Old 04-08-2003, 10:42 PM   #3
teiva-boy
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If you haven't also installed an additional 1V sensor pre-cat/post turbo.. the readings are flawed.
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Old 04-08-2003, 11:19 PM   #4
kenshiro
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Default

Quote:
Originally posted by teiva-boy
If you haven't also installed an additional 1V sensor pre-cat/post turbo.. the readings are flawed.
Yeah the top of the downpipe is a sweet spot to put a bung. I just did that tonight.
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Old 04-08-2003, 11:23 PM   #5
teiva-boy
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I've got two bungs.... Err, that came out wrong
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Old 04-09-2003, 02:25 AM   #6
KapaFool
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How much accurate would the A/F gauge be if the sensor is installed into a catless uppipe? I am reading lean at WOT so far.
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Old 04-09-2003, 02:29 AM   #7
atomicapples
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i was always told that the a/f is installed after the turbo.
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Old 04-09-2003, 04:02 AM   #8
teiva-boy
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Quote:
Originally posted by atomicapples
i was always told that the a/f is installed after the turbo.

You are correct. Putting it pre-turbo can influence it's readings due to the high pressure the sensor sees. Jon in[CT] has a great post about this somewhere.
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Old 04-09-2003, 12:05 PM   #9
mbiker97
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What's with all the A/F thread all of a sudden?

Anyway most aftermarket O2 sensor work the best at around 600 C which works out to be 12-18" from the turbo in the downpipe. Don't put an O2 before the turbo as there is positive pressure and the reading will be wrong.
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Old 04-09-2003, 12:28 PM   #10
codean
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All the autometer A/F gauge is good is blinking lights unlike the greddy A/F gauge which works ok.
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