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Old 11-04-2008, 09:06 AM   #1
MarylandWRX
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Default i have an A/F gauge on its way to me.

but what i hear from people around me is that for some reason it wont work on my 2002 WRX. (Its The Auto Meter Ultra Lite Boost Gauge, and Auto Meter Ultra Lite A/F Gauge)
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Old 11-04-2008, 09:20 AM   #2
Uncle Scotty
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it is useless

you need a true wideband o2 sensor....the wrx uses a narrowband sensor

so you will need a different input than the stock o2 sensor

there are several ways to do this and none are cheap

PLXDevices
Innovate
AEM

Search for it
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Old 11-04-2008, 10:10 AM   #3
indytruckboy
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If it isn't a 1-wire O2 sensor, I was under the impression that it is a wide-band.
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Old 11-04-2008, 10:45 AM   #4
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Quote:
Originally Posted by indytruckboy View Post
If it isn't a 1-wire O2 sensor, I was under the impression that it is a wide-band.
The way that subaru uses its sensors is called narrowband because they limit the operation of the sensor. I believe the sensor is actually capable of reading as a wideband if its location is changed and you use special software to configure and read it.

BUT, for all intensive purposes, the stock sensor should be considered narrowband and should not be considered a replacement for a wideband. (basically, its useless to have a gauge on this sensor)
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Old 11-04-2008, 12:07 PM   #5
MarylandWRX
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ok so well i got the gauges for 30 bucks shipped (cuz guy had no use for them) so ill keep the boost and sell the A/F one to a friend.
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Old 11-04-2008, 12:47 PM   #6
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lol - thats what good friends are for!!! hehe...
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Old 11-04-2008, 01:49 PM   #7
MarylandWRX
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haha, yea, so when i get this gauge, anyone on here want first dibs on it, if my friends dont want it?
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Old 11-04-2008, 02:22 PM   #8
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paperweight
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Old 11-04-2008, 02:26 PM   #9
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Innovative LC-1. Check it out. That's the one I decided on. Josh at Importimageracing.com usually has some good prices.
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Old 11-04-2008, 05:05 PM   #10
efjellanger
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Quote:
Originally Posted by gto7419 View Post
The way that subaru uses its sensors is called narrowband because they limit the operation of the sensor. I believe the sensor is actually capable of reading as a wideband if its location is changed and you use special software to configure and read it.
Narrowband and wideband sensors are of totally different construction. Narrowband sensors are constructed so that they swap from very low output to very high output at a specific AFR. They don't tell you actual AFR, just "rich" and "lean". The ECU tunes the AFR by intentionally causing the tune to oscillate between too rich and too lean, and watching the response from the sensor. More info.

Wideband sensors have an output corresponding to a real AFR value.

Quote:
BUT, for all intensive purposes
"intensive purposes"... read these two words and ask yourself what they mean. Then ask yourself if they make sense to use this way.
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Old 11-04-2008, 05:59 PM   #11
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Originally Posted by efjellanger View Post
Narrowband and wideband sensors are of totally different construction. Narrowband sensors are constructed so that they swap from very low output to very high output at a specific AFR. They don't tell you actual AFR, just "rich" and "lean". The ECU tunes the AFR by intentionally causing the tune to oscillate between too rich and too lean, and watching the response from the sensor. More info.

Wideband sensors have an output corresponding to a real AFR value.



"intensive purposes"... read these two words and ask yourself what they mean. Then ask yourself if they make sense to use this way.

Actually, there was an interesting thread on romraider where someone used a stock subaru o2 sensor (post turbo) as a wideband and it functioned relatively well...
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Old 11-04-2008, 07:15 PM   #12
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Interesting. Do you have a link?
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Old 11-04-2008, 08:59 PM   #13
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Well, as long as you are pulling the signal before the cat(s), you should be fine. No matter what the ECU uses, it's still a wideband. Downstream would be affected by the cat(s), so that one would not give you a proper signal.

***This is all my 14 years of prof. tech. work talking. And it's my opinion. Use it if you want, or don't. I don't care. I have a A/F gauge coming and I am pulling it off the upstream. Besides. It's a freakin gauge. The ECU is using the same signal to keep itself stoicheometric. If I was making a 400whp F4, I would use a couple of EGT probes.
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Old 11-04-2008, 09:12 PM   #14
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Quote:
Originally Posted by indytruckboy View Post
Well, as long as you are pulling the signal before the cat(s), you should be fine. No matter what the ECU uses, it's still a wideband. Downstream would be affected by the cat(s), so that one would not give you a proper signal.

***This is all my 14 years of prof. tech. work talking. And it's my opinion. Use it if you want, or don't. I don't care. I have a A/F gauge coming and I am pulling it off the upstream. Besides. It's a freakin gauge. The ECU is using the same signal to keep itself stoicheometric. If I was making a 400whp F4, I would use a couple of EGT probes.
lemme guess

you are new to subarus

you'll blow up a couple before you get it right, if you are lucky
and GL using the front o2 for any kind of usefull AF......oh yeah
if you splice the front o2 wiring....do a REAL good job of it cuz borking THAT will blow these up REAL quick and oh yeah....
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Old 11-04-2008, 09:31 PM   #15
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^^^ +1 - I wouldnt use the stock o2 sensor as a wideband - Im just saying its been done. Just for clarification, even a wideband will not reliably function in the stock o2 location...

Im trying to find that link btw...
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Old 11-04-2008, 09:34 PM   #16
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For your viewing pleasure - I never read BOTH threads (one is linked to the other), but it appears that the stock sensor is accurate until about 11:1

http://www.romraider.com/forum/topic3979.html
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Old 11-05-2008, 09:33 PM   #17
indytruckboy
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Quote:
Originally Posted by Uncle Scotty View Post
lemme guess

you are new to subarus

you'll blow up a couple before you get it right, if you are lucky
and GL using the front o2 for any kind of usefull AF......oh yeah
if you splice the front o2 wiring....do a REAL good job of it cuz borking THAT will blow these up REAL quick and oh yeah....
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