O2 sensor placement?
#2147127
09/04/16 02:05 AM
09/04/16 02:05 AM
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Joined: Jan 2003
Posts: 20,192 Park Forest, IL
slantzilla
OP
Too Many Posts
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OP
Too Many Posts
Joined: Jan 2003
Posts: 20,192
Park Forest, IL
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Is it better to weld the bungs right into the headers or will I get better readings putting them in my collector extensions? My extensions will be 3"X24" long for now. Thanks!
"Everybody funny, now you funny too."
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Re: O2 sensor placement?
[Re: slantzilla]
#2147131
09/04/16 02:22 AM
09/04/16 02:22 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Put it about 6" behind the end of the primaries and make sure its pointed downward so it doesnt hold any water(above 9 oclock- 3 oclock).. dont get to close to the end of the collectors so it doesnt see the fresh air
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Re: O2 sensor placement?
[Re: slantzilla]
#2147152
09/04/16 04:24 AM
09/04/16 04:24 AM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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Agree, mines 6-7" past the merge just after the flange in my side pipes........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: O2 sensor placement?
[Re: slantzilla]
#2147185
09/04/16 09:51 AM
09/04/16 09:51 AM
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Joined: Feb 2003
Posts: 1,942 Metro Detroit
OUTLAWD
top fuel
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top fuel
Joined: Feb 2003
Posts: 1,942
Metro Detroit
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I read something that wanted them at least 18" from the end of the extension.
Faster, Faster until the thrill of speed overcomes the fear of death...
71 Swinger - slowly collecting dust/parts 66 Belv. II - just a streetcar 88 Mustang - turbo LS beater
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Re: O2 sensor placement?
[Re: slantzilla]
#2147238
09/04/16 12:14 PM
09/04/16 12:14 PM
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Joined: Jan 2003
Posts: 20,192 Park Forest, IL
slantzilla
OP
Too Many Posts
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OP
Too Many Posts
Joined: Jan 2003
Posts: 20,192
Park Forest, IL
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Yes, from what I've read too close to the outlet will cause lean readings. I want to do the best I can to not send myself in wrong directions to start.
"Everybody funny, now you funny too."
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Re: O2 sensor placement?
[Re: slantzilla]
#2147240
09/04/16 12:22 PM
09/04/16 12:22 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Yes, from what I've read too close to the outlet will cause lean readings. I want to do the best I can to not send myself in wrong directions to start. You said you would be adding collector extensions.. so you will be fine with what I said
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Re: O2 sensor placement?
[Re: slantzilla]
#2147250
09/04/16 12:35 PM
09/04/16 12:35 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
master
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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A very simple test to see if your particular combo is likely to pull "free air" back to the wideband, is to let it idle, and put a piece of paper at the exhaust exit. Seems crazy, but it is not uncommon for the paper to be pulled back against the pipe between pulses. If it does that, you need to move the sensor as far away from the exit as possible, or ignore the readings at low engine speeds. If it does do this, be sure to get a good seal at the header to extension connection.
"use it 'till it breaks, replace as needed"
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Re: O2 sensor placement?
[Re: slantzilla]
#2147406
09/04/16 04:55 PM
09/04/16 04:55 PM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
master
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master
Joined: Feb 2011
Posts: 4,302
Nebraska
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An O2 manufacturer, cant remember which one, said rule of thumb is 36" from closest exhaust port.
Mopar to the bone!!!
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Re: O2 sensor placement?
[Re: slantzilla]
#2147426
09/04/16 05:35 PM
09/04/16 05:35 PM
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Joined: May 2006
Posts: 1,260 New Mexico
Adobedude
pro stock
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pro stock
Joined: May 2006
Posts: 1,260
New Mexico
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And make sure you can get the damn thing screwed in after everything is installed. FYI...It's of major important you don't have any exhaust leaks prior to the O2 sensor.
Last edited by Adobedude; 09/04/16 05:38 PM.
2001 Dodge Dakota 408 All Motor 11.27 @ 117.83 mph 2017 NM Mopar Challenge Series Champion.
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Re: O2 sensor placement?
[Re: slantzilla]
#2147786
09/05/16 03:00 AM
09/05/16 03:00 AM
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Joined: Jan 2003
Posts: 20,192 Park Forest, IL
slantzilla
OP
Too Many Posts
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OP
Too Many Posts
Joined: Jan 2003
Posts: 20,192
Park Forest, IL
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Looks like 6" back from the primaries puts them about 4" from the exit flange. I can point them straight out to the sides and be able to get them in and out. Thanks everyone.
"Everybody funny, now you funny too."
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