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Old 05-24-2002, 02:25 AM   #1
Diversion
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Default Autometer Air-Fuel Ratio Gauge

This gauge has three wires, Black, Red and Purple. Purple used to recieve the Air-Fuel Ratio signal.

The car has two Oxygen sensors, a front and a rear. I'll be just tapping the ECU. Do I need to tap the signal wire for the front or rear Oxygen sensor? Thanks.

Jay
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Old 05-24-2002, 02:29 AM   #2
zsurfrin
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the rear sensor
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Old 05-24-2002, 02:32 AM   #3
Diversion
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You're the best zsurfrin, I don't care what the moderators say about you.


Jay
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Old 05-24-2002, 02:32 AM   #4
Jon [in CT]
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Ditto on the rear.
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Old 05-24-2002, 02:39 AM   #5
BeavisNuke
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Rear is the B17 pin.

While we're on the subject of A/F gauges - I know how innacurate they are when put on a stock car, but now my A/F gauge is plugged into the only catalytic converter on the car, the rear one. (I replaced up-pipe, downpipe is cat-free now)

Does this make it actually useful or should I ditch the gauge? :[
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Old 05-24-2002, 02:53 AM   #6
Diversion
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Personally I say leave it in. Some people like ditching their Air/Fuel gauges for EGTs. I say have both! Monitoring Air/Fuel and Exhaust temps together can track down any potential problems in the car (when that day comes) rather than having one or the other. Leave it in the catalytic convertor, and when a test pipe with a oxygen sensor bung becomes available for the WRX comes out, the Air/Fuel gauge will be of even more use.

So yes, i'd say your gauge is of much more use now than it was when you installed it when you were still running stock.

Jay
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Old 05-24-2002, 02:54 AM   #7
KapaFool
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I have just installed the autometer a/f gauge. I think its pretty useless. I have seen the usual install in another WRX by splicing into the stock sensors and it doesn't work all the time. I bought the autometer oxygen sensor also and installed it into the extra bung on the Vishnu uppipe. It works great but I can't do tuning with a bunch of lights. The autometer site has an explanation on their FAQ about WRX oxygen sensors not working with the autometer gauge.
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Old 05-24-2002, 08:25 AM   #8
Diversion
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Well I do consider the Autometer "Dancing" light Air/Fuel as a safegaurd/generalization of what the air/fuel ratio is. I would NEVER use it to tune your motor, it's not THAT accurate. It will however raise a red flag if you're seriously leaning out or too rich. I'm not using it as a serious tool, just as a "general" monitor to give me a general idea of that the mixture is on the car.

I think it's FINE for that. For those that want a professional type, look the other way, Autometer doesn't have that. Most Air/Fuel gauges i've seen are lights.. I'm not sure who designs needle type, but I would assume the needle would be a bit more accurate.

Jay
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Old 05-24-2002, 10:30 AM   #9
roybfr
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I have one and it is a good monitor. From my reading in the past is that the readings at WOT are what's most important. Until then the car is constantly adjusting which is one of the reasons for the lights being all over the place.

On Autometer FAQ I believe they are revering to the front sensor which is 0-5v, which this gauge will not work with but the rear is 0-1v so it should be fine.

Troy
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Old 05-24-2002, 10:37 AM   #10
dug-e-fresh
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with the Vishnu uppipe (and others) there is a bung for installing an 02 sensor just before the turbo... quite an accurate place for one. I bought a Bosche unheated unit and screwed her in... connected and away we go...

Very responsive readout/setup, but using the rear sensor will prove to be MUCH less accurate or responsive.

Tap the rear 02 on the ECU for now, but the real solution if you wanna keep the A/F gauge is to mount an auxillary 02 sensor much further up stream.... at least before all the cats.... and the best way to do that is to install a catless uppipe with an 02 bung... I recommend Vishnu Performance's design....

def
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Old 05-24-2002, 10:56 AM   #11
4sfed 4
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Quote:
Originally posted by KapaFool
It works great but I can't do tuning with a bunch of lights
I hear ya there. Thats why I usually use a multimeter to read O2 voltages, along with EGT. With a multimeter, you can read the exact O2 voltage, whereas the "lights" represent voltage ranges.

But, the lights are good for once you get it tuned in as its easier to see a red light out of the corner of your eye than read a digital display. It gives you a general idea where you are.
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Old 05-24-2002, 11:17 AM   #12
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If you all are looking for a more accurate a/f gauge take a look at greddy's semi-wideband gauge. They use their own o2 sensor that is actually fairly accurate. The gauge actually shows what your ratio is and not some meaningless numbers. On the down side you will need a bung in the up-pipe or somewhere before cats and of course the price. I should have mine installed within a couple weeks.

-Subix
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Old 09-13-2002, 05:20 PM   #13
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Default B-17 pin

exactly which wire is this?does anybody have a diagram similar to the one from apexi?
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Old 09-13-2002, 05:51 PM   #14
Tuning Factory Inc.
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Quote:
Originally posted by subix
If you all are looking for a more accurate a/f gauge take a look at greddy's semi-wideband gauge. They use their own o2 sensor that is actually fairly accurate. The gauge actually shows what your ratio is and not some meaningless numbers. On the down side you will need a bung in the up-pipe or somewhere before cats and of course the price. I should have mine installed within a couple weeks.

-Subix
I agree. The autometer POS is just a volt meter. You can do the same thing with any volt meter or an OBD-II scan tool. The Greddy is very nice and you can calibrate it agains the wideband whenever you get to a dyno.
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Old 09-13-2002, 06:22 PM   #15
MAD REX
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Default Re: B-17 pin

Quote:
Originally posted by phatfil
exactly which wire is this?does anybody have a diagram similar to the one from apexi?
Check www.projectwrx.com

That's where I got the instructions
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Old 09-13-2002, 06:27 PM   #16
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thanks BIG mad rex !!!!!!!
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