Odd question about wideband

[Kringle]

If this is in the wrong area i apologize, kind of still new to the forum and i don't frequent it as much as i should. Anyway, i recently picked up a 91 GSX and have been going through the car. I noticed that the car had 2 O2 sensors and didn't pay no mind at the time since i had a lot of other work to do. Now that I'm waiting on some other parts to come in figured i tackle this two O2 sensor thing. So the front O2 sensor is the stock sensor and is still hooked up to the factory harness. The second O2 sensor is the wideband which is connect to the ECU as well. After chasing the wires for a few minutes i found that the wideband is connected to the ECU via the Barometric pressure sensors from the MAF (pin 16 i believe). Im about to just swap sensor locations and remove the stock O2 sensor and plug that hole then rewire the ECU correctly. So i guess my question is will the current set up give me any issues with tuning the car, and if not how would i set up the wideband in ECM link V3 ?

Thank You

 

[gseclipse93]

Do some research on Ecmlink Narrow band o2 sensor simulation. Pretty simple and strait forward.

 

[boostdawd]

Please fill out a profile so we can see what mods you have. If u do have ecmlink then u can simulate narrowband but need to connect it to the front O2 sensor input. The barometric input is only used for speed density.

 

[Kringle]

HaHa if i knew what mods i had i would. There has been a few owners of this car now (me included) and each one has done a little bit more i guess. I still need to comb through all of it, right now I'm just working on getting it running and fixing the stuff that the other owners never did. I will fill out a profile the best i can for y'all though, but my main focus is to get it running before i tear it all apart again to see what i really got. If the barometric pressure input is only used for speed density why do all the ECU pin outs I've read say pin 16 is Barometric Pressure Sensor (MAF)?

So anyway let me rephrase the question...

Will having my wideband connected to pin 16 (barometric pressure sensor) give me any issues with tuning in the future? and if not how would i set that up in ECM live? I get that i can simulate a narrowband signal, that isn't the issue. If i have to rewire the ecu the right way, move sensors around to properly use pin 4 i can, i have no issues with that.

I'm unable to get a computer connected at the moment so i haven't been able to get into ECM live to play with it yet other then displayed value stuff.

 

[lasershark]

Helpful link
https://www.ecmtuning.com/wiki/installnewsensor
generally speaking the ecu uses barometric pressure to adjust fuel and timing in respect to atmospheric pressure. Atmospheric pressure will vary depending on altitude and temperature and blah blah blah. Long story short yes it will affect tuning...
I would reconnect the barometric pressure like factory and simulate narrowband through ecmlink...
Did I miss anything @GST with PSI (you asked for it )

 

[Kringle]

Helpful link
https://www.ecmtuning.com/wiki/installnewsensor
generally speaking the ecu uses barometric pressure to adjust fuel and timing in respect to atmospheric pressure. Atmospheric pressure will vary depending on altitude and temperature and blah blah blah. Long story short yes it will affect tuning...
Did I miss anything @GST with PSI (you asked for it )

Thank you, and i agree with your statement. I work on airplanes and know that Barometric pressure affects the power of engines, jet and car alike. Just not sure if it would affect my ability to tune a DSM with ECM link or if there was someway around it. Before this turns into a huge debate i guess ill make my life easy and just do what everyone else does, if it works don't fix it type thing. Ill just go ahead and rewire the ECU and tape into the O2 sensor wire with my wideband.

Thank you all for the help

 

[GST with PSI]

I'm confused, is the car on SD, or are you still running a MAF?

 

[Kringle]

I'm confused, is the car on SD, or are you still running a MAF?

It's still on MAF. And yes a MAF sensor sends a Barometric pressure signal to the ecu for proper fuel delivery.

 

[GST with PSI]

The MAF needs the baro reading to function properly. Whoever wired in the WBO2 did it incorrectly.

If you traced the wire back to the baro ECU pin I assume there's already a wire extending to the ECU. If that's the case, the easiest solution (to me) would be to just swap that wire to the EGR Temp Input (ECU Pin 15) and you'll have a functioning WBO2 with minimal hassle. There's no harm in running the stock O2 in conjunction with a WBO2, and I'd encourage doing so if you have free ECU inputs, as 2 sensors will provide redundancy.

After the WBO2 is wired in, simply simulate it via the NBO2 sim tab in ECMlink. Done.

 

[Kringle]

The MAF needs the baro reading to function properly. Whoever wired in the WBO2 did it incorrectly.

If you traced the wire back to the baro ECU pin I assume there's already a wire extending to the ECU. If that's the case, the easiest solution (to me) would be to just swap that wire to the EGR Temp Input (ECU Pin 15) and you'll have a functioning WBO2 with minimal hassle. There's no harm in running the stock O2 in conjunction with a WBO2, and I'd encourage doing so if you have free ECU inputs, as 2 sensors will provide redundancy.

After the WBO2 is wired in, simply simulate it via the NBO2 sim tab in ECMlink. Done.

Cool idea thanks. I was just about to address this issue tonight. So If I use the egr pin at the ecu, I'm assuming I just select my wbo2 to the right of the egr box in ecu link. Then save pin assignment correct?

I'm sure it's been cover a bunch in other threads I'm just being lazy right now and don't feel like searching for it while on the john

 

[GST with PSI]

So If I use the egr pin at the ecu, I'm assuming I just select my wbo2 to the right of the egr box in ecu link. Then save pin assignment correct?

That's correct. You also need to select "EGR Temp" in the drop down menu on the ECU-side pin assignments in order to simulate the WB. Hopefully you're using an Innovate WB, which will make life exponentially easier.

Once the pin is assigned don't forget to go into ECMlink and add the WBO2 to your captured and displayed values.

 

[Kringle]

That's correct. You also need to select "EGR Temp" in the drop down menu on the ECU-side pin assignments in order to simulate the WB. Hopefully you're using an Innovate WB, which will make life exponentially easier.

Once the pin is assigned don't forget to go into ECMlink and add the WBO2 to your captured and displayed values.

Unfortunately it is not a innovate wbo2, it's a AEM gauge that I'm half tempted to replace with an innovate. I've read all the issues they have with ecm link. thanks for the help it was very useful advice. Goal is to have this car running by the end of next week.