OBX Header and o2 Sensor Fit Issues / drive clean time...

spencersummerfield · Post by **spencersummerfield** » Tue Mar 17, 2009 9:59 am

Alright another question,

I have this header and had it for a while now it is awesome, BUT i an running my upper 02 Sensor in the runner of cylinder #4.

If I am not mistaken you are SUPPOSED to run the 02 in a collector not off a single runner.

There is a location to run it in the collector but that is just the problem.

My Oxygen Sensor will not fit in the Collector on because it is long.
It hits the floor of the car and can't be put in place.
See the pic above the yellow is where it is hitting.

Does anyone have any suggestions for how to get my 02 Sensor in the collector area without cutting the floor. LOL

Could I tip the engine backwards, the torque strut distance maybe extend it.

ANY ideas are great!

INVUJerry · Post by **INVUJerry** » Tue Mar 17, 2009 3:09 pm

I've been running my upper o2 sensor in just a primary runner of my FF header since August, and my AFX for 6 months before that. There's no problem doing it like this.

DR. GONZO · Post by **DR. GONZO** » Tue Mar 17, 2009 4:49 pm

could you fab another hole for it somewhere else? keep me informed becuase i have the very same header on order lol

Post by **occasional demons** » Tue Mar 17, 2009 10:41 pm

The only risk you have; is if there is an injector clogged, or not shutting, it will only catch it if it is on #4 cylinder. The lean, or rich exhaust will go right out the pipe undetected.

Donkeypuncher · Post by **Donkeypuncher** » Wed Mar 18, 2009 3:20 am

It's a calculated risk doing it that way. Odds are that situation won't happen, but if it does then it's going to cost a whole lot more than just having another O2 bung welded into the collector now.

You would think this problem would have been addressed by OBX by now, since it's a pretty simple fix for them.

Cabbs · Post by **Cabbs** » Wed Mar 18, 2009 4:56 am

I'm guessing the 01's and 03+ are different. My 05 has an upstream and downstream sensor. All I had to do was extend the wires for the down stream and it fit without clearance issues.

spencersummerfield · Post by **spencersummerfield** » Wed Mar 18, 2009 12:48 pm

occasional demons wrote:The only risk you have; is if there is an injector clogged, or not shutting, it will only catch it if it is on #4 cylinder. The lean, or rich exhaust will go right out the pipe undetected.

Funny u say rich, I am getting a P0172, and I thought that it was reading to h because of my afx/r. So I was hoping if I moved it down then my rich might go away or at least even out.

Post by **occasional demons** » Wed Mar 18, 2009 4:35 pm

I guess it also depends on how picky the PCM wants to be. You are also only sampling 25% of the exhaust. I would just have a bung welded into the mid pipe inlet, and hope the gasket doesn't leak. Unless you want to go through the hassle of removing the LTH, and having one welded in at a different angle. Maybe the other side. It is hard to tell from the pic if there is any more clearance over there.

spencersummerfield · Post by **spencersummerfield** » Wed Mar 18, 2009 11:47 pm

It's hard to say but 25% is in myopinion not good enough. I will take a better picture this weekend when I try and find a solution.

My other option is to install my brandnew spare tti header from modern. The 02 collector is a LOT smaller than the obx.

hybrid-Srt2001 · Post by **hybrid-Srt2001** » Thu Mar 19, 2009 3:26 am

just thread a spark plug into the upstream o2 bung and extend the sensor wires to the collector of the header, and thread it in, or have a bung welded on if there isn't one. The afx/r doesn't even need a down stream o2 so....

spencersummerfield · Post by **spencersummerfield** » Thu Mar 19, 2009 11:29 am

hybrid-Srt2001 wrote:just thread a spark plug into the upstream o2 bung and extend the sensor wires to the collector of the header, and thread it in, or have a bung welded on if there isn't one. The afx/r doesn't even need a down stream o2 so....

Extending wires is not the issue, I also realize that my afx only requires 1, 02 sensor.

Let me also mention that the header is stainless making it a pain in the ass, since I personally cant weld stainless.

The issue if you read closely is that the 02 sensor HITS THE CAR not that i need to extend.

I am going to take some more pics, replace the 02 AND the PCM and see what happens.

Post by **occasional demons** » Thu Mar 19, 2009 12:21 pm

If you have accecess to oxyacetylene torches, then you could braze a bung in there, or use steel filler rod. the steel would be a stronger bond, tho not really needed for the application. The steel will also rust and be ugly. But it would take years to fail.You don't need stainless to weld to stainless. As long as it's steel or brazing rod it will bond.
If someone crawls under there and bitches how it looks, just kick 'em in the balls/puss for being there!

DR. GONZO · Post by **DR. GONZO** » Thu Mar 19, 2009 12:57 pm

have you been able find a soloution yet? any idea on how it sounds ?

hybrid-Srt2001 · Post by **hybrid-Srt2001** » Thu Mar 19, 2009 1:37 pm

a sledge hammer will fix the clearance issue real fast.

spencersummerfield · Post by **spencersummerfield** » Wed Mar 25, 2009 11:21 am

DR. GONZO wrote:have you been able find a soloution yet? any idea on how it sounds ?

COmputer replacement done, and new BOSCH 02 Sensor fixed all issues. Except for my manual IDLE..............

But I have no problems running it in runner 4 now that it is the proper computer, so in reply to your question yes use the upper o2 sensor and you will be fine.

DR. GONZO · Post by **DR. GONZO** » Sun Apr 05, 2009 9:05 pm

what were the gains ? you got from it?