I just bought a set of hooker headers (used) without the bungs installed to them. i dont want to put the o2 bungs on the headers, i'd rather have them on Y pipe. is this a good idea or bad? if bad where can i put them for good reading for the O2 sensor? i bought two bungs from summit. I own a 94 chevy camaro z28 with an LT-1

 

I would just put them on the headers where they normally go.

 

I kinda don't wanna put them on the headers. I'd rather put them on the Y pipe

 

Okay, why?

 

well I mean I could but the guy I bought them from said to mount them on the Y pipe bc they don't have a place for the o2 sensor on headers in the first place which I know I have to make the holes for the o2 bungs but when he bought the headers they never came with the o2 bungs on them, so he told me to put the bungs on the Y pipe

 

you want them as close to the cylinder as possible where all the primaries meet ESPECIALLY for the front o2's. Putting them in the y-pipe is stupid and will throw off how the engine runs as far as air/fuel mixture. Put them in the collector where they NEED to go. stop trying to argue it and just put them in the header collector.

 

it's his car, let him do what he wants....even though it was suggested 2x now that he put it where it "needs" to go

 

Why is that?

 

O2 sensors should be mounted on the collectors of the headers and not the y pipe. If you are unable to mount it to the connectors for some reason then mount the sensor as close as possible to the collector. This means right up at the joint.

 

Why all the fuss about this? The o2 sensors can go in either place and I've even seen header collectors sold with bungs in them. At the dyno, the A/F wideband sensor in stuck in a tailpipe.....

The best reason for the O2's to be in the header is to be ahead of the connection that could leak, leading to a false lean reading. Beyond that, I can't think of a single reason why it would matter. Catalytic converter placement matters as you want the exhaust hot enough to keep the cat working....

 

dude don't tell me where to put them. I asked where to put them and I'm not arguing I'm just looking at it in a diff perspective. ^ he knows what he's talking about and I doubt you do, yea I could put them on the headers but I was just trying to see what ppl thought about puttin them on the y pipe. No big deal, don't have to have a fit about it

 

Exhaust starts to cool the second it leaves the engine. O2s are in the manifolds because that is where they operate the best, at higher temperatures. One could argue that the temperature difference between the manifold and the y-pipe is negligible in nature and likely won't affect the readings of the O2, but then again, who knows?

The tip of the O2 sensor also needs to be projected directly into the exhaust stream. Not saying this is the case, but the junction of the header/y-pipe could cause exhaust turbulence limiting a laminar flow of exhaust over the sensor. Additionally like bw_hunter mentioned, is if there was a leak (ever so small), a false lean condition would result.

In all likelihood you could put it there, but if you're a stickler like me, you'd put it where it's been engineered to go. JMHO.

 

You don't have to have an attitude. Nobody is forcing you to do anything. We are just trying to help.

The general consensus is to mount them to the header's collector. But since you don't want to do that for whatever reason then the next best thing is to mount them as close to the collector as possible. Just be sure to have a really good seal at that header joint.

Whatever you decided to do, let us know how it works out.

 

ok so if I put them on the headers how close do I put them to the collectors? I just drill a hole that will fit the bungs and weld the bungs in the hole. If so should they be pointing inward or outward? The pictures on summit looks like they point outward maybe for clearence?

 

Whatever you do make sure they are mounted between 10 and 2 o'clock. This will help to keep moisture away from them. I'd try and find a picture of a Pacesetter header and see where they have them mounted. If I remember right, my LPPs have them mounted vertically on the driver side, and at 2 o'clock on the passenger side.