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Wideband AFR sensor location #2779342
05/29/20 07:02 AM
05/29/20 07:02 AM
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Rochester, New York
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GregY Offline OP
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Hi All,

I think I would like to get an AFR sensor for my car. My question is, should it go in the header collector, or the exhaust directly downstream of the collector but before the H-pipe?

I would plan on installing it on the passenger side, is there any reason the drivers side would be a better choice?

Thanks.

Greg

Re: Wideband AFR sensor location [Re: GregY] #2779356
05/29/20 08:29 AM
05/29/20 08:29 AM
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Sniper Offline
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Being it's likely a heated sensor closeness to the engine is not as relevant, which opens up your option.

Which side to put it on, well if you knew the fuel distribution characteristics of your engine I'd put it on the side that had the leanest cylinder. You can figure that with exhaust temperature sensors.

Short of that, you look at real estate, the driver's side on a typical Mopar is fairly crowded, even more so if it's a stick car. So for clearance sake the passenger side is usually the choice. In the header collector is probably best, if you have the room and angle it with a bit of a down slope so that moisture won't collect in it when the system cools down.

Re: Wideband AFR sensor location [Re: GregY] #2779374
05/29/20 09:23 AM
05/29/20 09:23 AM
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USA
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360view Offline
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If it were my vehicle, after making the investment in a wide range AFR sensor, I would make the best use of the $ by installing eight bungs on all cylinders. After measuring and getting 8 cylinders balanced to your preferred tolerance, leave the AFR either in the “most average” cylinder, or in the leanest cylinder if you fear detonation on some of the future fuel you might have to use.

Re: Wideband AFR sensor location [Re: 360view] #2779380
05/29/20 09:46 AM
05/29/20 09:46 AM
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jlatessa Offline
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Are there bungs small enough for a 1-7/8 or 2" header pipe?

Thanks, Joe

Re: Wideband AFR sensor location [Re: jlatessa] #2779430
05/29/20 12:08 PM
05/29/20 12:08 PM
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Sniper Offline
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It requires a 1" hole so I guess that depends on your ability to weld, though I would think the sensor in the header pipe would be more of a restriction than in the collector.

Re: Wideband AFR sensor location [Re: GregY] #2779432
05/29/20 12:11 PM
05/29/20 12:11 PM
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Oregon
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AndyF Offline
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Either side is fine, collector or in the head pipe shortly after the collector is fine. Make sure you mock it up first since the sensor is fairly long and you don't want to force the cable into a tight bend. While you have the car up on the rack I'd put a bung in both sides so you can swap the sensor from side to side in the future.

Re: Wideband AFR sensor location [Re: AndyF] #2779439
05/29/20 12:33 PM
05/29/20 12:33 PM
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KATY TEXAS
csk Offline
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Originally Posted by AndyF
Either side is fine, collector or in the head pipe shortly after the collector is fine. Make sure you mock it up first since the sensor is fairly long and you don't want to force the cable into a tight bend. While you have the car up on the rack I'd put a bung in both sides so you can swap the sensor from side to side in the future.

This ^^^^^^^^^ and
And make sure the sensor is angled, the wire end a little above the threaded end so moisture cant get or sit in the sensor & ruin it.

Last edited by csk; 05/29/20 01:09 PM.

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Re: Wideband AFR sensor location [Re: csk] #2779462
05/29/20 01:19 PM
05/29/20 01:19 PM
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Rochester, New York
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GregY Offline OP
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Thank you all.

I agree, a bung for every cylinder would be ideal, but I don't think I will be going that route...

The responses give me something to think about to come up with a plan.

Thank you.

Greg

Re: Wideband AFR sensor location [Re: GregY] #2779526
05/29/20 04:36 PM
05/29/20 04:36 PM
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Lincoln Nebraska
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RapidRobert Offline
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where would you guys say to put it with ex manifolds?


live every 24 hour block of time like it's your last day on earth
Re: Wideband AFR sensor location [Re: RapidRobert] #2779528
05/29/20 04:48 PM
05/29/20 04:48 PM
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Oregon
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AndyF Offline
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Here is where I put the O2 sensor on my Coronet engine.

DSC_3754 (Large).JPG
Re: Wideband AFR sensor location [Re: AndyF] #2779629
05/29/20 09:41 PM
05/29/20 09:41 PM
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Lincoln Nebraska
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RapidRobert Offline
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Thank you Andy up


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Re: Wideband AFR sensor location [Re: GregY] #2779663
05/30/20 01:50 AM
05/30/20 01:50 AM
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Bend,OR USA
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Cab_Burge Offline
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If your using a exhaust system with no X or H pipe put a bung inn both sides and swap the sensor back and forth twocents scope
Angle the bung like already mention to prevent moisture to condense inside the sensor end to prevent damaging it up wrench

Last edited by Cab_Burge; 05/30/20 01:51 AM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Wideband AFR sensor location [Re: 360view] #2779670
05/30/20 06:10 AM
05/30/20 06:10 AM
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Washington
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madscientist Offline
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Originally Posted by 360view
If it were my vehicle, after making the investment in a wide range AFR sensor, I would make the best use of the $ by installing eight bungs on all cylinders. After measuring and getting 8 cylinders balanced to your preferred tolerance, leave the AFR either in the “most average” cylinder, or in the leanest cylinder if you fear detonation on some of the future fuel you might have to use.


Have you ever tried to tune with an O2 sensor in every primary tube? You will spend so much time for zero gain. It’s not worth it. And the O2 sensor is not the total answer. You can get lost very quickly with it, it will fib to you and not every sensor will read the same.

It’s a tool and like any other tool of that sort it has its limitations. I’ve watched guys drive themselves nuts chasing an O2 number. You still need to look at the plugs, and then tune to those and the O2 numbers are what they are.


Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
Re: Wideband AFR sensor location [Re: 360view] #2780112
05/31/20 05:09 PM
05/31/20 05:09 PM
Joined: Dec 2007
Posts: 12,331
Great Neck,LI,new york
hemi-itis Offline
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Originally Posted by 360view
If it were my vehicle, after making the investment in a wide range AFR sensor, I would make the best use of the $ by installing eight bungs on all cylinders. After measuring and getting 8 cylinders balanced to your preferred tolerance, leave the AFR either in the “most average” cylinder, or in the leanest cylinder if you fear detonation on some of the future fuel you might have to use.

The leanest cylinder can be determined with a plug reading so only one bung is needed


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