Help!!!! Midpipe with only 3 O2 sensor holes...

YellowCobra04 · 07-03-2009, 03:01 PM

I just bought a used Bassani catted x-pipe off a wrecked 2003 cobra and when I got it there was only 3 O2 sensor holes. Ther are the two behind each of the cats and one on the driver side where it bolts to the exhaust manifold. But my problem is I dont have one on the passenger side at all. The thing I don't understand is why there is only three, and how the guy that first owned it before me ran it. Thanks for all the help.

metaman · 07-03-2009, 03:56 PM

That is kind of nutty, just have another bung welded in by an exhaust shop.

EvilTwins · 07-03-2009, 05:25 PM

Can't you just delete the rear O2's in the tune? Then you can use the third bung for a wideband.

03killacobra · 07-03-2009, 05:28 PM

2 bungs before or after the cats? you gotta run the 2 o2's before the cat, as evil twin stated the third bung is used for wideband and rear o2's turned off.

MalcolmV8 · 07-03-2009, 06:41 PM

Quote:

Originally Posted by EvilTwins

Can't you just delete the rear O2's in the tune? Then you can use the third bung for a wideband.

Can you use the wide band sensor so far back in the pipe? after the cats? I ask because I just bought a wideband and I was going to have a bung welded in closer to the exhaust manifold, probably right behind one of the OEM O2 bungs near the manifold. Is that not required?

MalcolmV8 · 07-03-2009, 07:48 PM

I did a little googling on this and you don't want the wideband installed after the cats. The readings will be leaner and also there's a delay with it been so far downstream of the OEM o2s but the manifold so if you're data logging what you log will be delayed from what the ECC is getting off of it's o2s up by the manifold.
Everything I've read says don't install your wideband sensor after the cats and try to put it as close to the OEM O2 sensors up by the manifold as you can.

03cobra#694 · 07-04-2009, 07:40 AM

Quote:

Originally Posted by MalcolmV8

I did a little googling on this and you don't want the wideband installed after the cats. The readings will be leaner and also there's a delay with it been so far downstream of the OEM o2s but the manifold so if you're data logging what you log will be delayed from what the ECC is getting off of it's o2s up by the manifold.
Everything I've read says don't install your wideband sensor after the cats and try to put it as close to the OEM O2 sensors up by the manifold as you can.

Correct

unforgiven · 07-04-2009, 07:57 AM

Quote:

Originally Posted by metaman

that is kind of nutty, just have another bung welded in by an exhaust shop.

+1