Hey all,

Quick question on what the recomended install is for a wideband to get the most accurate reading possible. Install guide suggests minimum of 12" from block, and into some piping ofcourse, wiring straight forward. Were my application is making me think is the layout of the header I'm using, being the Shark Racing 4-1 product. The local garage has been helping me figure out the emissions part of having that product with a high flow cat and a basic muffler so stuff has been moved around quite abit.



I have one already prepared bung quite close to the 12" guideline but would be acceptable, thing is it would only monitor cylinder 3. Deal or no deal? If not thats reasonable, thing is I would cut another hole into the thing, making that cut the third into the peice, already a 2 peice design. I am a bit skeptical on leaks and performance with so many holes, so I had in mind at that point to grab the newer design thats floating around. Should I proceed with that idea and have a much cleaner end result?



Thanks for opinions!

 

I put mine after the cat.

 

Why in the world would you put a wideband AFTER a catalytic converter? Are you trying to monitor how efficiently the converter is removing hydrocarbons? The 12" is so you don't fry the sensor I think. If you are only monitoring one cylinder then you will miss a rich or lean condition on any of the others. If you have a drastic problem on #1 and start melting the piston running lean, but your O2 sensor is on #3's runner, it does you no good at all.



If there is a bung on the runner for #3, put a short bolt in it and seal the hole, then put a new bung in the collector. Before the cat.



If you're worried about leaks, weld the bolt in the bung.

 

^^^ Thanks, was my plan, primary 02 is in the collector as well so they will just have to share the space haha.

 

You really should change that. the cat really messes with an O2 sensor's readings so the data you're getting is very flawed.

 

talking of wideband's... My car doesnt run a o2 sensor... I should probably get one wired into my computer??? Where is the best place to put it?



Cheers Ryan

 

In the exhaust manifold, before the catalytic converter.

 

Ahahaha this thread is great, seems a need for some one to do a faq on these topics.

 

you dont say stocker



In a turbo situation, should it be 12" from the rear housing of the turbo? I have seen xr6 turbo's with them only 4-5 inch's of the rear housing. And also stocker my car doesnt run a catalytic convertor

 

If there is no cat, your engine computer is still in the dark without an O2 sensor telling it what's up. Put it far enough away from the turbo that it won't melt.