Competition gasser exhaust question

[keimmmo]

We are not really wanting to make a race vehicle out of it, but a good friend has a '95 Dodge van with a 360 in it. It has an exhaust sensor in the y-pipe just ahead of the converter. We are in central Mexico and polution controls ARE NOT an issue!!! The exhaust is bad, and we want to put on dual exhaust. How do we deal with the sensor?



We have ideas, but don't really know. I am looking for KNOWLEDGE, not just ideas.



Thanks for any help you guys can give.



Steve Keim

 

[Hohn]

I've no experience with a '95 Dodge in this respect.

On some gassers, you can just dangle the O2 with no problems. On others, the mpg and performance will be terrible.

Most systems like this are closed-loop and will run, but not well with the O2 dangling.

 

[banshee]

Any oxygen sensor in front of the converter(s) has to be in there to give the computer information on the air/fuel mixture. This sensor has to be in the exhaust stream otherwise you will get a check engine light and the motor will run terrible. The good news, however, is that the sensor has absolutely no idea about what goes on after it. It wasn't until 1996 that OBD2 was required, and part of this requirement was to run oxygen sensors before (as required) and after the cats to make sure 1) that they are in good working order and 2) you didn't cut them off. Fortunately, the aftermarket responded and made "O2 simulators" that fool the computer into thinking that the rear sensors are in the exhaust stream and that everything is ok. The fronts need to be there, though... even with full longtube race headers, and you can't use sims on them. You can cut off the cats and run a full dual exhaust on your van without any problems from that sensor... just don't take it off!



Hope this helps!

John

 

[Hohn]

Thanks, John. Any homework for me to do?

hahaha. .

 

[Nate]

95 is OBD I and will only have 1 sensor. That sensor tells teh ECM how much oxygen in in the exhaust... rich or lean bascially.

 

[JApol]

are you puttong on TRUE duals? ie 2 separate sets of pipes? I would mount it in the x or h pipe and call it a done deal

 

[keimmmo]

We want to run TRUE duals. Can you put it in only one pipe? Is there a way to run dual sensors... one in each pipe?



Steve Keim