Do I need 2 O2 sensors?

[Catbox_95]

If I have a wideband O2, is it necessary to have the original O2 sensor? Keep in mind that I do not have a catalytic converter and I have a rear O2 eliminator. So I only have the 1 O2 sensor that is up close to the manifold. But since I have a wideband, why do I need the originaly O2 sensor?

Thanks-

 

[Catbox_95]

To add more to the question, doesn't the O2 sensor figure out what the air/fuel mixture is like, then adjust the air/fuel mixture accordingly, which is what is already done with a wideband? It would seem that 2 is not necessary, or would that jack up something with the computer?

 

[spyderturbo007]

If I have a wideband O2, is it necessary to have the original O2 sensor? Keep in mind that I do not have a catalytic converter and I have a rear O2 eliminator. So I only have the 1 O2 sensor that is up close to the manifold. But since I have a wideband, why do I need the originaly O2 sensor?

Thanks-

Depends

You have to have a front O2 sensor, how you do it is up to you. Some widebands have a secondary output for a narrowband voltage. This output will send the appropriate voltage to the ECU in place of your front O2 sensor. This way, you can replace your front O2 with the wideband and be done with it.

But there are problems doing that.

According to most manufacturers, the WBO2 sensor isn't going to last very long so close to the exhaust manifold. Apparently it gets pretty hot up there where our front O2's are mounted.

To add more to the question, doesn't the O2 sensor figure out what the air/fuel mixture is like, then adjust the air/fuel mixture accordingly, which is what is already done with a wideband? It would seem that 2 is not necessary, or would that jack up something with the computer?

Yes, that is exactly what it does, but it is only used by the ECU at cruise and idle. At WOT, the O2 sensor voltage is disregarded by the ECU. The point of the WBO2 is to see that actual AFR at WOT. You can then tune yourself off of the pig rich factory maps of 9.5:1.
The reason for needing a WBO2 (0 - 5v range) is that the stock narrowband sensor (0 - 1v range) sucks for tuning.

Hope something in there helped!

 

[Catbox_95]

Thanks Spyderturbo007, that was very helpful. I guess I'll just leave in my front O2 and put the WBO2 sensor behind it.

 

[Maglin]

Yes. You can use your WB O2 and if it has a simulated NB output you can use it for your ECU. You need to ensure that it's output isn't reversed or it will just go either rich or lean and not cycle. Also you would want to place your WB O2 sensor about 3 feet from your turbo at least. WBo2's are not accurate under high heat and they start to die. If you still have a secondary o2 bung then just plug your first o2 bung and use it off the second one. I only run the WB O2 which is placed directly under the firewall in the exhaust. I've converted my ECU to run 0-5v WB and it works like a champ. Being you have a 95 you can get with Jeff at dsmchips.com and see if he can incorperate the WB02 code into the 2G. I'm not to sure if he can but it wouldn't hurt. My AFR with the stock NB would swing as much as 2 AFR due to my hugh 1000cc injectors. Now it only swings about .5 afr which is where it should be.

If all that seems not worth it just put the NB back in the frist hole and WB in the second. If you want to log with your WB hook its 0-5v output to the second O2 wire on the ECU and you will be able to log your WB with your datalogger. You will get a CEL for the second O2 as it will be way out of range. You could just install a switch to go from your simulator to your WB when you want to log with it and the CEL will only be on when you are using your WB.

 

[spyderturbo007]

Thanks Spyderturbo007, that was very helpful.

That's what we're here for.....Enjoy!

 

[11sec_GSX]

Does anyone know if I will still need my secondary O2 sensor now that I am going to be running the AEM EMS? Just wondering if I need to purchase a new one or not? Thanks.

 

[Dark_Horse]

Your 2nd O2 sensor is just there to tell you if your cat is still working. If you remove the O2 sensor you'll get a CEL. Not that big of a deal, there are ways to supress the CEL anyway.

 

[WikedSicc]

If you are using the aem uego, you will not need either of the 2 stock O2 sensors. The uego is all you need. By the way, I sent you a PM about your front bumper for sale.