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Old 10-16-2000, 01:05 PM   #1
FargoRS
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Cool Anyone try an Air/Fuel meter

I have seen some cheap air/fuel meters for about $130 for sale at some of the Impreza tuner sites. Has anyone installed one? If so, are they showing any lean conditions on the 2000/2001 aftermarket air intake setups vs. the stock setup? Also, are they pretty easy to install?
http://www.spomotorsports.com/images/Spo/arm1.jpg

Thanks,

Mike
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Old 10-16-2000, 01:19 PM   #2
Sean McElderry
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You can get the Autometer Phantom series A/F meter for $60.00. It is a good gauge. I've used one for a few months in my RS. Yes, they are extremely easy to install. Just attach power and ground, and then take the signal from your ECU and you're done.

Sean
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Old 10-16-2000, 01:29 PM   #3
8Complex

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Am I wrong in thinking that the guage is just based off of the voltage coming out of the O2 sensor? I mean, why couldn't someone just make some kind of digital readout of the voltage and use that? Personally I would think it'd be preferred since you could do it in a much smaller space...
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Old 10-16-2000, 01:33 PM   #4
stimpy
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An air fuel guage is just a voltage meter. The jumptronix (www.jumptronix.com) a/f guage is a perfect example of this. Keep in mind that on MY00+ the front o2 sensor is a broadband o2 sensor which is not compatible with a standard air fuel guage. You would have to either weld in an additional o2 bung for a dedicated o2 sensor or use the rear(after the cat) o2 sensor which is delayed and not as accurate.
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Old 10-16-2000, 01:39 PM   #5
8Complex

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You know, in theory that front wide-band O2 sensor would be just fine if we knew what was too rich/lean and what was just right, right? All it is is a number, so what if it is different as long as it reads the same...
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Old 10-16-2000, 02:13 PM   #6
RidinLow
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Yeah, but the problem is getting a meter that is able to read a 5V signal.
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Old 10-16-2000, 02:16 PM   #7
Greg Sharpe
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I've heard that low impendence voltmeters provide a "short-circuit" for O2 sensors, causing the O2 sensors to become rather inaccurate.
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Old 10-16-2000, 02:20 PM   #8
tulit
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Greg is right.

You need to be very careful with just hooking a voltmeter to the signal line.

The truth is, low internal resistance voltmeters (usually cheap ones) can cause damage to the sensor and the ECU, but effectively giving the signal a path to ground.

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Old 10-16-2000, 03:53 PM   #9
Nigel
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Here you go guys!!! A DIY EGO meter using a National Semiconductor LM3914. Parts shouldn't cost more than $10.
http://www.students.tut.fi/~eppu/dev/EGO-bar.html

I found this courtesy of a guy on www.zcar.com

Nigel
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Old 10-17-2000, 07:38 PM   #10
ImprezaRS dot com
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Thanks Nigel, I think Mike Jerry's turbo RS has a display similar to that.

Larry www.ImprezaRS.com
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Old 10-18-2000, 08:10 AM   #11
stimpy
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I thought about something like that, but after doing some voltage checks on the front o2 sensor on my MY00, I have no idea what the optimal range should be.

[EDIT] heres another one while we are on the subject: http://www.myzero.com/gauges/afgauge.html

[This message has been edited by stimpy (edited October 18, 2000).]
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