Would i need to weld another 02 bung into my exhaust or can i replace my stock with a wideband?

 

2007 cobalt sc

 

Beat the insides of the cat out, and you can remove the rear o2 sensor and put the wideband sensor in its place, when you get tuned they can delete the rear o2 code.

 

id like to keep my cat so I can pass an e test aha.

 

You dont need to remove the cat.

 

I also read you can delete the rear 02 sensor during tuning. Will this affect my e test? also is it okay to use the post-cat 02 bung for a wideband as far as tuning is concerned
?

 

you wouldn't need to remove the cat, but I would place the wideband before the cat so you're getting the afr readings out of the block. Only reason for the rear o2 is to ensure that the cat is working.


Not sure how they do emissions testing in canada, but here in texas, they hook up at the ob2 and read the readiness codes. If there's more than two readiness monitors that are off, you fail. That, or if you have any cel's.

 

so long story short i should go get another 02 bung welded in pre cat?
in ontario im pretty sure they just check your emissions coming out of your tail pipe, however we are switching to the obd 2 system in the next year or so

 

Yes its fine. No it shouldnt affect it as long as you delete the codes.

 

I would just weld an new bung into the downpipe right before the cat. On our cars its really easy to run a wideband

 

I'm not sure why you would have to weld another bung. I've always thought stock ss exhausts had two o2 sensors (one pre-cat, and one post-cat). Then again, I haven't had a stock exhaust for a bujillion years....

 

If he's trying to put it in stock rear o2 sensor, yes you would

 

the reason being is in some states they still test the exhaust through the tail pipe. If you were to eliminate the rear o2 you would not only need to delete ur cat codes but also the cat itself. which in itself would effect the tail pipe emissions if ur area still runs that way along with the
obd2 scan. welding in a bung takes like 5 min if you take the dp off you car and either do it urself or bring it to a shop. The downpipe has a sweetspot far enough off the header and just before the cat which works perfect and would compromise anything.

 

nope

 

No you dont. Exactly how i have mine ran.

 

Ps: all catted down pipes stock or aftermarket has 1 pre cat and 1 post cat to tell the car emissions are working

 

Not getting correct afr readings then......needs to be pre cat...this is preschool fundamentals

 

......lol, the first one is for your primary o2 which you need, and is also too close in the exhaust stream

 

Definitely correct readings. Cruising tune is set 14.7. I see 14.7 on my wideband.

WOT is set 13.5, I see 13.5

 

Right.......I guess AEM is lying also?

http://www.schnitzracing.com/manuals/AEMWBK.pdf

"For accurate readings, the sensor must be mounted before catalytic
converters and/or auxiliary air pumps."

Innovative must be liars and incompetent idiots also right?
http://www.innovatemotorsports.com/s...C-1_Manual.pdf
"On CATALYTIC CONVERTER equipped vehicles:
Install the oxygen sensor’s bung upstream from the catalytic converter"

that's funny, they both have the same placement

WOT it will skew it less, cruising will throw it off the most.

 

Im just saying what im seeing. There isnt much error.

 

I'd like to see your first log and see how off it was and what was adjusted in the tune, cause it being in the wrong spot could be compensated for and make you think such...

 

You mean fuel trims? They are off anyway because of winter. My tune was dialed in when it was 60* out.

Im saying my WOT AFR is tuned at 13.5, and I see 13.5 on my wideband. My cruising AFR is 14.7 (i see WOT AFR at 90 something percent throttle)

 

no..re read..

 

I did...please explain.