Rear O2s
Thread Starter
Burning Brakes
Joined: Oct 2014
Posts: 1,211
Likes: 60
From: Artesia NM
Rear O2s
Need some info on deleting the rear O2s on my 2004 Z06. It is supercharged with long tubes and a Corsa exhaust, still has the cats and rear O2s operational. Here is the deal: planning on installing an Alky Control System soon. I'm in the process of installing a Wide Band right now. My cats are right up against the headers, so no room to put an O2 sensor for the Wide Band before the cat. I am planning on deleting the cats anyways. Just gonna gut them so no need for piping mods. That way I can just use one of the rear O2 bungs for the Wide Band O2 sensor. I know if I get rid of the cats before I get the rear O2s tuned out I will get a check engine light indicating the cats aren't working, but the question is.....If I drive it like this for a while, until I get the Alky System installed and the tune done, will it affect the performance and if so, how???
Pro
Joined: Jul 2011
Posts: 608
Likes: 17
From: South Lyon, MI
I would not mount your wideband where the rear o2 are, its pretty far and the exhaust stream looses its efficiency that far down. My ARH xpipes that came with longtubes have the wideband bung mounted on the passenger side about 8-10'' upstream of rear O2s. So closer to the headers.
As far as driving around with rear o2 still on after the cats are removed I would not worry about it. Your rear O2 sensors just work in a closed loop to give feedback on catalyst efficiency for emission purposes. You might run a bit rich but that's about it. An old trick to get rid of the check engine light for the mean time is to put o2 spacers so you move the o2 sensors further away from the exhaust stream.
As far as driving around with rear o2 still on after the cats are removed I would not worry about it. Your rear O2 sensors just work in a closed loop to give feedback on catalyst efficiency for emission purposes. You might run a bit rich but that's about it. An old trick to get rid of the check engine light for the mean time is to put o2 spacers so you move the o2 sensors further away from the exhaust stream.
Thread Starter
Burning Brakes
Joined: Oct 2014
Posts: 1,211
Likes: 60
From: Artesia NM
I would not mount your wideband where the rear o2 are, its pretty far and the exhaust stream looses its efficiency that far down. My ARH xpipes that came with longtubes have the wideband bung mounted on the passenger side about 8-10'' upstream of rear O2s. So closer to the headers.
As far as driving around with rear o2 still on after the cats are removed I would not worry about it. Your rear O2 sensors just work in a closed loop to give feedback on catalyst efficiency for emission purposes. You might run a bit rich but that's about it. An old trick to get rid of the check engine light for the mean time is to put o2 spacers so you move the o2 sensors further away from the exhaust stream.
As far as driving around with rear o2 still on after the cats are removed I would not worry about it. Your rear O2 sensors just work in a closed loop to give feedback on catalyst efficiency for emission purposes. You might run a bit rich but that's about it. An old trick to get rid of the check engine light for the mean time is to put o2 spacers so you move the o2 sensors further away from the exhaust stream.
Pro
Joined: Jul 2011
Posts: 608
Likes: 17
From: South Lyon, MI
That's fine, but your rear o2 are way down though...I thought long tubes put the cats further down, on the xpipe not the header itself? Either way for the wideband put the bung right after the cats, they are going to be hollow anyways.
Thread Starter
Burning Brakes
Joined: Oct 2014
Posts: 1,211
Likes: 60
From: Artesia NM
That is the plan. Thanks for your input.
