Ok, so Im ready to kick a small child right now.

I got my new o2 bung welded up today at a muffler shop. They screwed up, and said they had to stack another bung on the first one creating a spacer of sorts.

How badly would this screw up my wideband readings. My idle is the same, cruising is off by a bit. But under partial throttle (while boosting low PSI) Im seeing 12.3-13afr. I know this could be due to the fact I just installed an o2 housing/dp combo. But I want to know how badly a spacer could affect my wideband reading. Im guessing this spacer has me about 1/4 farther out, then just 1 nut.

 

I was just looking into getting a wideband done and I think it was AMS that sells a spacer to use. The spacer is for eliminating the CEL that can come with putting an aftermarket exhaust on. Im not sure if it was for the wideband o2 you put on downpipe or the sensor on cat pipe. Maybe they put an extra bung on to create a spacer for that reason?

 

It's not for a wideband O2 sensor ... it's purpose is to space out the O2 sensor that goes after your cat/test pipe, moving it out of the path of the exhaust gases so it tricks the ecu into believing you are getting a "normal" reading. This prevents the ECU from throwing a CEL. You want the wideband sensor to have an accurate reading so using a spacer to move it out of the direct exhaust flow seems like it will give you a false/altered reading and be of little benefit.

 

Thats the truth. I would not allow them to use a spacer on mine and also make sure they have to air leaks around it. I have seen shops weld a bung on a exhaust while it is still on the vehicle and not be able to get a good bead around the top part of the bung and it will pull air from that point. From what I have seen in that case is that the idle/low throttle a/f is off but the wot runs will be ok but it can leave you guessing alot.

 

If it's an AEM wideband or any other brand, i think a good call is to contact manufacturer since they are the ones who built the sensor to specifics, and a picture sent to them might help to on clarifying your doubts, should they find any issues with this work... Good Luck.

 

This is from Innovate Motorsports (most brands use the same Bosch sensor)

Sensor Placement. The sensor bung (or boss) should be at least 8" away from the combustion cylinder (at or after the collector if you have one, unless you're installing a sensor for each cylinder). To avoid condensation running into the sensor, it should be installed at the side or on top, NOT on the bottom of the exhaust pipe, for example between the 10:00 and 2:00 position. If you don't have a bung, any muffler shop can weld one in for you. If you have a catalytic converter, install the sensor before it. If you have a turbo, install the sensor AFTER it. Extended bungs. For high performance and power sports applications, we strongly recommend using 1" bungs (p/n 3764.) These longer bungs increase sensor life in the "richer" conditions encountered under boost, leaded fuel use, or two-stroke applications

 

Whoa, this problem was solved the day after I post. Good reaction time.

 

Man you should know how forums are. One person brings it back and then everyone thinks its a new thread.

 

Hahaha for sure.

 

Hey Talon, so I've read a bit from you in the past year modding yours and saw an earlier posting with some anxiety about the O2/DP combo being too free flowing perhaps. I just got my own UR installed and their high flow CC also, mated up to the ETS duals.

Is the kick in the pants I feel normal?! I mean, WOW, I knew it would be louder under load and all, but I didn't expect the HP gain so easily. I've not tuned mine yet, so just curious how the full TB feels to you since you took this on more gradually than me.

Oh, what's your mileage? Out of warranty from that yet? The dudes at my DSM shop told me TB would void my warranty. I'm over 1/2 way there, and figured they'd give me grief over any claims anyway. Such as the one I found behind the manifold heat shield showing my O2 Housing and downpipe had a small leak. I figured that would be a no-win argument, not to mention my explaining why I had the shield off in the first place.