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Heck I'm only 5 not 67!
 
targa80's Avatar
 
Join Date: May 2002
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O2 Sensor from Narrow to Wide Band

I would like to eventually get a wide band AFR meter setup for my car and use the narrow band output to control the lambda ECU.

Question will a wide band O2 sensor screw into the narrow band exhaust connection or do you have to drill another hole and weld on the correct bung connector?

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Pat Henry
Targa80
1980SC Targa (Mocha Brown)
Old 10-01-2014, 01:29 PM
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Should be standard size.

Todd
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Old 10-01-2014, 01:42 PM
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Do a search. Should be standard size but I recall a thread on here recently where someone went to a wide band, tapped off it for the Lambda in manner that 'should have' worked and ended up with strange Lambda behavior.

If a risk, you may have to have a muffler shop put an additional bung on for the wide band and run both.
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Scott
1981 911SC Targa - Platinum Metallic
Old 10-01-2014, 06:59 PM
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Heck I'm only 5 not 67!
 
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I know that the wide band signal 0-5 volts is not compatible with the 0-1 volt for the narrow band input to the ECU. There are AFR gauges with a narrowband output that is converted from the wide band signal. As long as the narrowband output signal is calibrated from the wide band output the Lambda ECU should control the frequency valve as designed.
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Pat Henry
Targa80
1980SC Targa (Mocha Brown)
Old 10-01-2014, 08:43 PM
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Hey, nice marmot.
 
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I tried it with a PLX module using a standard Bosch wideband sensor. The K-Jetronic ECU does not seem to like the narrowband signal put out by the PLX. Jim Williams observed that the ECU has a very narrowly defined set of signals it is expecting. Anything other than what it expects seems to throw it off and cause poor running conditions. I've never gone so far as to compare the output of the stock O2 sensor and the narrowband output signal from the PLX with an oscilloscope but that is the only way to figure out if there are any differences.

For now my solution is to run two O2 sensors -- the stock narrowband setup and the wideband sensor connected to a gauge.
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There are those who call me... Tim
'83 911 SC 3.0 coupe (NA)

You can't buy happiness, but you can buy car parts which is kind of the same thing.
Old 10-02-2014, 08:32 AM
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I have the plx and it works great. Screwed in the wideband sensor into the stock location, and connected the simulated output to the original wiring. Absolutely no problems.

The plx saves a lot of work, as welding in another bung and running 2 oxygen sensors would be a pain.

You can tell the simulated oxygen sensor output works, because when its connected the afr is a rock steady 14.7. Disconnected, mine is set to run a bit rich.


Bo
Old 10-02-2014, 01:13 PM
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I've been using Innovate wide bands for years on other cars and it's pretty easy to program the additional analog outlets with the included software. I'm just getting started with this but the next part would obviously be finding out the curve for the narrowband output and programming the LC-1 or LC-2 with that so my 1982 CIS can read it
Old 03-19-2017, 12:21 PM
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i'm running the innovate LC-2, and i'm using the analog output nr. 2 to the lambda brain.
Standard configuration of this analog output is narrowband simulation, so basically plug and play, but you can alter this if you like.
The lambda brain accepts the input just fine.
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before: '69 Porsche 911T bahama yellow
now: 1981 911 SC Targa winered
Old 03-21-2017, 10:29 AM
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The wide and narrow band thread size is all the same. You just need to match the output voltage curve to mirror a stock narrowband which is a matter of adjusting the switch on the wideband controller. Anyone ever check the voltage curve is correct for the common wideband controllers (aem, innovate, plx)? I recall the factory troubleshooting books for Motronic and Jetronic cars had this info.. maybe even the Bentley book.

Shameless plug; I have a M&K euro premuffler with two bungs installed for sale .

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Jon
1988 Granite Green 911 3.4L
2005 Arctic Silver 996 GT3
Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1
Old 03-21-2017, 12:05 PM
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