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Old 03-01-2002, 02:26 AM   #1
Robmat
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Join Date: Aug 2000
Location: Daytona Beach FL USA/ Tampa FL USA
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2000 2.5 RS
BRP

Question What parts are needed for Autometer Ultralite A/F guage install?

Is all wiring included, or will I have to buy the necessary wiring and O2 bung?

Robmat
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Old 03-01-2002, 09:13 AM   #2
AndyM
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yes all the wiring is included, with instruction, and mounting bracket, Subaru's have 2 O2 sensors 1 in the front which is wide band and will not work the Autometer Air/Fuel gauge, but the one in the back which is right after the cat, that 02 sensor will work, but your not getting acurate readings because the cats clean up the exhaust.
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Old 03-01-2002, 04:50 PM   #3
tmat3
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All you need is wires.

Here is installation:
http://www.geocities.com/matsut_rpi00/autometer.html

You have to hook it up to your rear O2 sensor wire at the ECU. It takes literally 10 minutes to install. Or, you can also install another O2 sensor and make the AF meter read that sensor instead.
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Old 03-02-2002, 07:31 PM   #4
Robmat
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OK, here is the problem: I fabricated my own intake using aluminum tubing and also did the airbox mod creating a 3 1/4" intake all the way to the throttle body. Since the mod I have been eating gas like crazy. I wanted the A/F guage to monitor things. Is this really what I need and will the rear O2 sensor giv an accurate enough reading?

Thanks-

Robmat
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Old 03-03-2002, 06:45 AM   #5
tmat3
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In a way, Yes.

I use my A/F meter to check how my catalytic converter is operating, because that's pretty much what the rear O2 sensor measures. I have a Ganzflow, K&N, and Stromung. My A/F meter reads right in the middle at stoich when going 55mph. When something goes wrong with the emissions, for example when my front O2 sensor died, the A/F meter read rich because the ECU adds a lot more fuel to the engine.

So, if you get this gauge, and cruise at 55mph at steady throttle, and the A/F meter reads rich, the engine probably is eating more gas than it's supposed to. The best gauge to tell if your engine is running rich or not is an Exhaust Gas Temp gauge.

Also, I would use a vacuum gauge (or a boost gauge) to check if your engine has a vacuum leak or not. If your engine lacks vacuum, the fuel efficiency goes down. A vacuum gauge is like a health meter for your engine.
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