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mattcfish
Samba Member
Joined: October 24, 2006
Posts: 565
Location: Bellingham, WA
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 Posted: Tue Nov 27, 2012 5:57 pm Post subject: |
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| denwood wrote: |
Understood..I realize the wideband is using a different sensor that is much more accurate outside stoichiometric. That said, installing it a separate bung won't change much if you're interfacing to digifant with it's "dumb" output.
You only need one bung, and rather than monitoring the ECU -> connection directly as I'm doing currently, you'd run one output (emulator) to your ECU, and a 2nd output to the MTX controller/gauge. Correct? |
Yeah, but...I'm under the impression that a Digi ECU designed to use a Narrowband O2 won't work with a Wideband O2. Am I wrong?
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75 BMW 2002
76 BMW R90S
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denwood
Samba Member
Joined: July 29, 2012
Posts: 1047
Location: Thunder Bay, Ontario, Canada
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| Posted: Tue Nov 27, 2012 8:34 pm Post subject: |
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Just scanned the tech docs..the Mtx has two analog 0-5v outputs. You would connect one of those outputs to emulate the narrowband function to your ECU.
From the manual, it appears this analog output can be programmed .. so an interesting way to alter air/fuel in closed loop operation. Maybe some mileage gains to be had by leaning things out a bit at cruise. Has anyone out there programmed these curves??
Love the logging option too via serial. This gives the digifant system the option to at least log air/fuel ratio if fitted with the MTX.
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Dennis Wood
The Grape
Last edited by denwood on Tue Nov 27, 2012 8:46 pm; edited 1 time in total |
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presslab
Samba Member
Joined: September 29, 2008
Posts: 1730
Location: Sonoma County
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| Posted: Tue Nov 27, 2012 8:41 pm Post subject: |
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| denwood wrote: |
Understood..I realize the wideband is using a different sensor that is much more accurate outside stoichiometric. That said, installing it a separate bung won't change much if you're interfacing to digifant with it's "dumb" output.
You only need one bung, and rather than monitoring the ECU -> connection directly as I'm doing currently, you'd run one output (emulator) to your ECU, and a 2nd output to the MTX controller/gauge. Correct? |
The wideband sensor only connects to the MTX-L gauge. The gauge then has an output that can be used to drive the stock ECU.
That said, I don't use the emulated output. I only use the wideband while tuning, so I put the extra bung in an easy to access spot. It's easier than trying to patch into the ECU signal.
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mattcfish
Samba Member
Joined: October 24, 2006
Posts: 565
Location: Bellingham, WA
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| Posted: Tue Nov 27, 2012 8:47 pm Post subject: |
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| denwood wrote: |
| Just scanned the tech docs..the Mtx has two analog 0-5v outputs. You would connect one of those outputs to emulate the narrowband function to your ECU. |
Just gets better and better.
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75 BMW 2002
76 BMW R90S
85 Vanagon with 2.2L upgrade |
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tjet 
Samba Member
Joined: June 10, 2014
Posts: 3533
Location: CA & NM
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| Posted: Sat Sep 12, 2015 8:58 pm Post subject: Re: Wideband Air Fuel Ratio Gauge |
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Do you have multiple o2 sensor bungs installed, & just move the sensor as needed to different cylinders? |
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ohhorob
Samba Member
Joined: September 26, 2013
Posts: 212
Location: Santa Cruz
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| Posted: Sat Sep 12, 2015 9:06 pm Post subject: |
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No, you just use the standard bung. The AFR is total system, not cylinder by cylinder.
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tjet
Samba Member
Joined: June 10, 2014
Posts: 3533
Location: CA & NM
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| Posted: Sat Sep 12, 2015 11:51 pm Post subject: |
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| ohhorob wrote: |
| No, you just use the standard bung. The AFR is total system, not cylinder by cylinder. |
It's for a dual IDF WBX I bought last month. I want to check both carbs independently |
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