DIY Exhaust + O2 sensor
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Post Fiend
Joined: Oct 2003
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From: New Jersey
DIY Exhaust + O2 sensor
I have a 1993 F350 crewcab 2wd, 5sp truck with more miles than I can shake a stick at. Thanks to a pothole I didn't see under the snow and a few rusty exhaust hangers, my exhaust system broke off and is now "toast".
Thanks to the quote from Midas, I've decided to roll my own system and call it a day (or a weekend I guess), and run duals. Parts aren't the problem nor is time and ability, but what does concern me is where to re-thread the single o2 sensor.
I could mount it on one side, so it monitors only one half of the exhaust system, or I could fabricate up an "H" pipe and install the o2 sensor more or less in the center.
Would either solution actually be a good solution, or am I asking for trouble here?
If not, I'll merge both sides together like the factory does and run a single exhaust down one side as was done by the factory and the 5 muffler shops since I bought the thing
Thanks to the quote from Midas, I've decided to roll my own system and call it a day (or a weekend I guess), and run duals. Parts aren't the problem nor is time and ability, but what does concern me is where to re-thread the single o2 sensor.
I could mount it on one side, so it monitors only one half of the exhaust system, or I could fabricate up an "H" pipe and install the o2 sensor more or less in the center.
Would either solution actually be a good solution, or am I asking for trouble here?
If not, I'll merge both sides together like the factory does and run a single exhaust down one side as was done by the factory and the 5 muffler shops since I bought the thing
Postmaster
Joined: Oct 2009
Posts: 3,432
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Midas is not well known for having good exhuast guys. I'm not saying this is universally true, but many of the guys cannot bend pipe worth a darn. They are often self taught. It depends on the individual. BTW, what was the quote?
It is best to fabricate the h-pipe, you get a better sound anyway.
It is best to fabricate the h-pipe, you get a better sound anyway.
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Post Fiend
Joined: Oct 2003
Posts: 6,214
Likes: 13
From: New Jersey
Manifold to tailpipe was $1315 includng the factory-style dual-inlet cat. They weren't keen on my idea of duals all the way down becuase of the single o2 sensor, and that's a valid concern. I know with all the GM tuning I've done I can get away with this in the GM world, but not sure about the ford EEC. I worry that the EEC might not see enough o2 pulses and richen things out. With the mileage on the truck I get bad enough mpg as it is ;-)
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
You can get away with a single O2 on the Fords too, matter of fact it will run just as well as the stock setup. These narrow band O2 sensors are not fast enough to count pulses so that's not a concern, and neither is some extra delay caused by being a little further away.. like at the collector of a longtube header. My truck has been running with a single sensor in the passenger header for years and even passed emissions sniffer tests like that.
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Post Fiend
Joined: Oct 2003
Posts: 6,214
Likes: 13
From: New Jersey
Thanks Paul, that's exactly the info I was hoping for. I had guessed that was likely for the reasons you stated, but wasn't confident enough in that guess to spend hours fabricating dual exhaust only to have the EEC confused and run "pig rich" and fail NJ inspection. While my truck is registered in such a way that allows only an idle test, I still don't want to fail obviously.
Being that I'm cobbling this together, I can put the O2 sensor closer to the manifold just by welding a bung there. Machined the bung this morning in fact!
Thanks everyone for your help. Time to weld
Being that I'm cobbling this together, I can put the O2 sensor closer to the manifold just by welding a bung there. Machined the bung this morning in fact!
Thanks everyone for your help. Time to weld
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