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Old 03-16-2002, 10:52 PM   #1
roybfr
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Default Help with Autometer A/F Gauge and TurboXS Stage 1

I did a search in the forum before I went to install my Autometer A/F gauge, and read that I needed to tap into the B17 wire on the factory ECU. Well I have the TurboXS Unichip and harness. In this situation where is the best place to tap the signal. The B17 wire on the factory harness or the corisponding wire on the TurboXS harness. I will be easier to get to the TurboXS wires as there are already exposed where as the factory ones are covered up.

Also for those who have done this, did you just pull some of the sheeting back on the B plug, cut the B17 wire and crimp in the A/F signal wire, when connecting the B17 back together.

Troy
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Old 03-17-2002, 11:07 AM   #2
scooby
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i didn't run it off the ecu i just ran one single wire under the car to the rear O2 sensor clip and tapped into the single blue wire. I would rather tap there for the signal then near the ecu personal preference i guess.
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Old 03-17-2002, 01:30 PM   #3
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I DONT THINK THAT THE AF GAUGE IS THE WAY TO GO IF I REMEMBER CORRECTLY THEY READ OFF OF A DIFFERENT VOLT ON OUR CARS AN EGT GAUGE WOULD BE THE WISE CHOISE.
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Old 03-17-2002, 01:48 PM   #4
Kevin.T
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No the A/F gauge will not work as it uses the conventional 1 volt.
The WRX uses a digital signal of around 10 volts on the O2 ahead of the cat conv. It will sortof work on the downstream of cat conv. but activity on gauge wont be much in my opinion.

The A/F gauge works on a sine wave signal. Better of with a EGT gauge.
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Old 03-17-2002, 06:19 PM   #5
roybfr
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I installed 3 gauges at the same time, Boost, EGT and this A/F gauge. Others are using the A/F gauge so I am sure that there is some way to make it work that is not a total PITA. But if that is the case I will just get rid of it and put some thing else along side the other two gauges.
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Old 03-17-2002, 08:24 PM   #6
SW00P_G
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Quote:
Originally posted by roybfr
I installed 3 gauges at the same time, Boost, EGT and this A/F gauge. Others are using the A/F gauge so I am sure that there is some way to make it work that is not a total PITA. But if that is the case I will just get rid of it and put some thing else along side the other two gauges.
Jesus people the rear O2 sensor is a conventional 1 volt. And I tapped mine right up at the ECU. Much easier than crawling under the car. I've used it for 35,000 miles and have not had a problem. I know it works becuase I can adjust my AFC and see the change in the gauge for all the doubters.
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Old 03-17-2002, 08:43 PM   #7
roybfr
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Quote:
Originally posted by SW00P_G


Jesus people the rear O2 sensor is a conventional 1 volt. And I tapped mine right up at the ECU. Much easier than crawling under the car. I've used it for 35,000 miles and have not had a problem. I know it works becuase I can adjust my AFC and see the change in the gauge for all the doubters.
Thanks for the clarification, I had read a post about the voltage being 1 volt so I was pretty sure that the 10 that scooby is saying is off.

I am going to just call Mark tomorrow at TXS to see weather I should tap the wire on the factory harness or the TXS harness.
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Old 03-17-2002, 09:59 PM   #8
bobgrice
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I mounted a dedicated O2 sensor 4" after the turbo on the downpipe (my BPM downpipe already had a bung).

This way, you get a reading before the cat, give some more accuracy. I would say that this is still not the most accurate measurement of A/F, but the combination of an EGT gauge and the A/F gauge is the way to go for the sake of redundancy.

I think I will be adding an O2 bung to the up-pipe soon to move the sensor further upstream, which I understand is better for accuracy.
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Old 03-17-2002, 10:27 PM   #9
WRXnFX
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Will the rear 02 sensor fit the Vishnu uppipes? Or is there a different type/brand of sensor needed?

Winslow
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