Wideband O2 question...placement in exhaust stream

[frodo84]

I have a C5 with long tubes, cats, x-pipe, etc. (Supermaxx). I am waiting for my new flashscan stuff, and want to purchase and use a wideband O2. I'm going with the PLX setup, would it be okay to use the existing bung downstream of the (very short, directly downstream of the headers) high flow cats? I had my SS headers coated to reduce heat, and don't want to put a new bung through the coating if I can help it. I was thinking I could either use the wideband for logging and for the PCM (some have been able to make it work fine, I hear), or put in a new bung. Any advice/opinions? Thanks for the help...

[bink]

For idle tuning I'd put it in front of the Cat.
There's disagreement as to whether the Cat will effect the O2 sensor at idle. Off-idle I don't believe it will effect the O2.
FWIW.

[Bruce Melton]

You could replace the front 02 and pull both WB and NB off the PLX Bosch sensor.

[frodo84]

thanks, that's probably what I'll do....I don't want to mess up my cermachrome coating.....

[Dirk Diggler]

huh :?: :?: :?: :?: :?: :?: :?:

[Black02SS]

I'm with you Dirk. What'd he say??? :lol:

[SS2win]

Damn! It's a spambot!!! fawkers.

[leres]

You could replace the front 02 and pull both WB and NB off the PLX Bosch sensor.

That's exactly what I did and it works fine. I've mostly been driving around with a stock tune and have had no problems. I plan to start tuning once V7.2.3 is released.

[Patches]

I went with a separate bung in my passenger header for my PLX WB. At the time, no one had really sorted out the NB emulation too well so I didn't want to chance it. Plus, I played it conservatively and kept the stock NB in in case my WB dies prematurely (After all, I installed it! :lol: ) I also went ahead and put in a temp probe while I was at it. It did minimal damage to the Jet Hot coating. Now, I'd be more tempted to skip the extra bung and go with emulation. Here's a link to my installation.

http://redshift.homestead.com/WBO2.html

[joecar]

Nice header.