1999 wideband 02 sensor conversion - Ford Mustang Forum
 
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post #1 of 5 (permalink) Old 03-15-2010 Thread Starter
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1999 wideband 02 sensor conversion

I have been doing some reading on how O2 sensors work and why they are useful. My understanding is that the stock 02 sensors are NOT wideband and are more or less digital (either running rich or lean). I have quite a few bolt on’s, and after installing O2 eliminators with the new x pipe and flow masters it smells a bit rich and the car will kill itsself from time to time. I am in need of a new tune but i was wondering if there was any way to upgrade the O2 sensors to wideband to help feed back more accurate information to the ECU(not just a gauge). Obviously this would require a custom flash but I was just wondering if it has been done or if there is even a reason to do it.
Secondly, when you install O2 eliminators is that compensating for the lack of catalytic converters or is it just sending back "dummy" information to the ECU just to make it happy?


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post #2 of 5 (permalink) Old 03-15-2010
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You can always install a wideband to see what your AF ratio really is but you would actually need one for both sides. To replace and let the ECU read that, i don't see how. Your ECU has a predetermined AF ratio that it tries to maintain using the signals from the 02's. If you get a dyno tune, the tuner can adjust that information in the ECU to either fix your problem, by either going a little leaner or richer, for optimal performance or (for FI applications) to keep it from going lean and causing fatal detonation. Once the tuner does that, your ECU will read the o2's with the new parameters and keep it there by constantly adjusting.
I'm sure more will chime in with more detailed info.


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post #3 of 5 (permalink) Old 03-15-2010
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Quote:
Originally Posted by stealthw31 View Post
I have been doing some reading on how O2 sensors work and why they are useful. My understanding is that the stock 02 sensors are NOT wideband and are more or less digital (either running rich or lean). I have quite a few bolt on’s, and after installing O2 eliminators with the new x pipe and flow masters it smells a bit rich and the car will kill itsself from time to time. I am in need of a new tune but i was wondering if there was any way to upgrade the O2 sensors to wideband to help feed back more accurate information to the ECU(not just a gauge). Obviously this would require a custom flash but I was just wondering if it has been done or if there is even a reason to do it.
Secondly, when you install O2 eliminators is that compensating for the lack of catalytic converters or is it just sending back "dummy" information to the ECU just to make it happy?
The wideband is just used to provide information for datalogging and for the users, as far as I know, there's no way to link them into the ECU so that the computer uses them to adjust the air/fuel ratio.

The rear O2 sensors just monitor catalyst efficiency, they do not provide any data that is used by the ECU to change air/fuel ratios either.

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post #4 of 5 (permalink) Old 03-15-2010
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Quote:
Originally Posted by Bullitt5339 View Post
The wideband is just used to provide information for datalogging and for the users, as far as I know, there's no way to link them into the ECU so that the computer uses them to adjust the air/fuel ratio.

The rear O2 sensors just monitor catalyst efficiency, they do not provide any data that is used by the ECU to change air/fuel ratios either.
I've been following the discussions about 02 sensors for some time and I personally think that wide band sensors are a farce. Everyone seems to think that wideband sensors are more accurate than standard but I have to call BS. If you take a gauge of any type and use it to measure anything, the less area the gauge spans the more accurate is will be.
Example: If you have an air pressure gauge where the dial sweeps 270 degrees and the low end is 0 psi and the top end is 5 psi you can literally measure air pressure in tenths of a psi whereas if the gauge sweeps 270 degrees and measures 0 psi to 60 psi you are lucky if the guage is accurate enough to measure 1 psi differentials.
To me it seems logical that the same would hold true for 02 sensor gauges. It seems that a wide band sensor would be used to get your air/fuel ratio close and then fine tune it with a narrow band sensor.
If this doesn't seem logical or is not true would someone please elaborate on the issue.

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post #5 of 5 (permalink) Old 03-15-2010
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Wide band is just for data logging and tuning purposes. O2 sensors actually read oxygen content and using an equation based on known inputs (fuel and air put in) the ecu determines a/f ratio and adjusts accordingly. Removing the cats will always smell rich because the cats burn unburnt fuel, without them there is more unburnt fuel making it out. Even if you could get the ecu to read to wideband it would probably be counter productive. Some of the faster guys remove the O2's from the system all together and run a table based setup.

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