Home » Public Forums » GMCnet » [GMCnet] Wide Band O2 Sensor Installation
| [GMCnet] Wide Band O2 Sensor Installation [message #102681] |
Tue, 12 October 2010 10:21  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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G'day,
I ordered one of the wide band O2 sensors that Bob Cook found on Summit
Racing. The deal is really good as you get a FREE mounting clamp! All you
have to do is drill a hole in the exhaust pipe and put the clamp over the
hole and clamp it down. By itself the clamp costs $35.
I assume the sensor will come with instructions as to where to mount it,
however, I figgerd' I'd ask the experts here.
I assume it doesn't matter whether it goes in the drivers or passenger side
cylinder bank exhaust.
Thanks,
Rob M.
USAussie
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Wide Band O2 Sensor Installation [message #102688 is a reply to message #102681] |
Tue, 12 October 2010 11:42  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| Robert Mueller wrote on Tue, 12 October 2010 11:21 |
G'day,
I ordered one of the wide band O2 sensors that Bob Cook found on Summit Racing. The deal is really good as you get a FREE mounting clamp! All you have to do is drill a hole in the exhaust pipe and put the clamp over the hole and clamp it down. By itself the clamp costs $35.
I assume the sensor will come with instructions as to where to mount it, however, I figgerd' I'd ask the experts here.
I assume it doesn't matter whether it goes in the drivers or passenger side cylinder bank exhaust.
Thanks,
Rob M.
USAussie
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Rob,
It would be best if you could put it after the collector. There may be variations between the banks. If you have to pick one, it really won't matter which you pick.
Matt (who once did cylinder specific tracking)
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Wide Band O2 Sensor Installation [message #102694 is a reply to message #102681] |
Tue, 12 October 2010 13:27 |
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Ok, here is what I did, my car was turboed so the sensor needed to be at least 2 feet down stream to make sure it survived. These things don't like EGT over 600*c for to long, so to maximize the life of the sensor I placed it where I did.
I don't understand this thing about a clamp, usually clamps are used when you insert the sensor into the tail pipe, not exactly practical for one man tuning on a GMC. Usually with the sensor there will be a mild steel bung that needs to be welded into the exhaust line. I would say the best place to do this would be right after the Y pipe merges this way you regester the exhaust stream as a total. Ideally you would use Innovates LM2 which would allow you to tune the left and right banks of the engine. The LM2 supports a second sensor which makes that possible. However for most the LC1 should be enough. $236 is a great pricefor the. LC1. The LM2 is more like 600 last I checked, but I would recommend for those tuning their own MPEFI system.
73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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| Re: [GMCnet] Wide Band O2 Sensor Installation [message #102704 is a reply to message #102694] |
Tue, 12 October 2010 14:55 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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Senior Member |
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| Duce Apocalypse wrote on Tue, 12 October 2010 13:27 |
Ok, here is what I did, my car was turboed so the sensor needed to be at least 2 feet down stream to make sure it survived. These things don't like EGT over 600*c for to long, so to maximize the life of the sensor I placed it where I did.
I don't understand this thing about a clamp, usually clamps are used when you insert the sensor into the tail pipe, not exactly practical for one man tuning on a GMC. Usually with the sensor there will be a mild steel bung that needs to be welded into the exhaust line. I would say the best place to do this would be right after the Y pipe merges this way you regester the exhaust stream as a total. Ideally you would use Innovates LM2 which would allow you to tune the left and right banks of the engine. The LM2 supports a second sensor which makes that possible. However for most the LC1 should be enough. $236 is a great pricefor the. LC1. The LM2 is more like 600 last I checked, but I would recommend for those tuning their own MPEFI system.
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After the y is probably a good idea. Mine got overheated on a hot summer day while driving around town. So I plan on moving it further down stream
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] Wide Band O2 Sensor Installation [message #102713 is a reply to message #102694] |
Tue, 12 October 2010 16:30 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Shan,
The clamp is a flat exhaust tube type clamp with the bung welded into it.
As noted to Matt I have a Quadra jet.
Regards,
Rob M.
USAussie
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Shan Rose
Sent: Tuesday, October 12, 2010 1:28 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Wide Band O2 Sensor Installation
I don't understand this thing about a clamp, usually clamps are used when
you insert the sensor into the tail pipe, not exactly practical for one man
tuning on a GMC.
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GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Wide Band O2 Sensor Installation [message #102716 is a reply to message #102688] |
Tue, 12 October 2010 16:30 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Matt,
OOPS - should have noted:
1 - Double Trouble has standard OEM manifolds and I have a spare set so it
will remain OEM manifolds.
2 - Double Trouble has a Paterson Quadra jet - the reason I bought the O2
sensor was to tune it real time.
Regards,
Rob M.
USAussie
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Matt Colie
Sent: Tuesday, October 12, 2010 11:42 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Wide Band O2 Sensor Installation
Rob,
It would be best if you could put it after the collector. There may be
variations between the banks. If you have to pick one, it really won't
matter which you pick.
Matt (who once did cylinder specific tracking)
--
Matt & Mary Colie
'73 Glacier 23 Chaumiere (say show-me-air)
SE Michigan - DTW 3.2/4R
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GMCnet mailing list
List Information and Subscription Options:
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_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Wide Band O2 Sensor Installation [message #102720 is a reply to message #102681] |
Tue, 12 October 2010 17:27 |
Gail Marks Cruiser
Messages: 125
Registered: August 2009
Location: Gold Coast, Australia
Karma: 0
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Senior Member |
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G'day,
Rob you must of been reading my mind.
I have been thinking fitting an air/fuel ratio gauge was the next step in improving the efficiency of our GMC. I too had pondered the best position for the sensor location, having deduced the best option was a sensor on each bank, about 4" after the manifolds.
Two sensors plus dual gauge = lots of dollars.
I have little knowledge of how 02 sensors work, but after a little self education, I had rejected the idea of putting one sensor after the collector thinking it was too "cold" at that point and that readings could be corrupted by the mufflers. Now those who know say one sensor is OK, this project is back on the drawing board.
Does any one out there have an 02 sensor fitted to a GMC with a carb and are they getting usable information from their set-up?
Mark Bennett
Gail & Mark's Cruiser
Gold Coast, Australia.
Motorhoming Lifestyle.com
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| Re: [GMCnet] Wide Band O2 Sensor Installation [message #102721 is a reply to message #102688] |
Tue, 12 October 2010 17:28 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Senior Member |
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| mcolie wrote on Tue, 12 October 2010 09:42 |
| Robert Mueller wrote on Tue, 12 October 2010 11:21 |
G'day,
I assume it doesn't matter whether it goes in the drivers or passenger side cylinder bank exhaust.
Thanks,
Rob M.
USAussie
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Rob,
It would be best if you could put it after the collector. There may be variations between the banks. If you have to pick one, it really won't matter which you pick.
Matt (who once did cylinder specific tracking)
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I think we are "OK" with it on one side. Our intakes have a convoluted path in there and each side has two cylinders feeding from the right side of the carb/TBI and two feeding from the left side.
On the EFI forum there has been quite a bit of chatter about location. Indeed they can get too hot but the "web" seems to say they run between 1200 to 1500° F. If your exhaust is 1500, I would be nervous... very nervous. Mine has been on the left stub pipe of my Thorley Headers for close to 17K miles and is surviving... so far. Some are recommending after the Y. This may be a smart place, especially if some day you get a bee in your bonnet and put in multiport injectors as you could have a bad injector on one side and never see it.
Another reason for putting it after the Y is if you have Fuel Injection, a bad plug not firing can cause computer confusion. The O2 sensor on that side will sense a lean mixture. (I know that sounds backwards, but the unburned hydrocarbons boiling out are not interesting to an O2 sensor. It is interested in the unused oxygen, and with no fire to use oxygen the sensor will call for more fuel. Then all cylinders will be too rich, with one not using oxygen.) After the Y makes the error 1/8 rather than 1/4.
(Please correct me if I am wrong... as one test for WB 02 is to spray it with carb cleaner.)
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: [GMCnet] Wide Band O2 Sensor Installation [message #102727 is a reply to message #102725] |
Tue, 12 October 2010 18:01 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Senior Member |
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The replacement OEM-style exhaust system from Leigh Harrison has the O2 sensor mounted on the driver's side, close to the junction of the stock exhaust manifold and the start of the exhaust tubing. The distance is about 6". This is the location that he uses with his fuel injection system. If anyone is interested, I could post a photo tomorrow. As a note, I have a O2 sensor in that bung, but I am not tapping it for any information. I have plans for the future, like all GMC owners.
Tom Phipps,
75 GMC Ex-Avion w/Q-Jet.
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] Wide Band O2 Sensor Installation [message #102729 is a reply to message #102727] |
Tue, 12 October 2010 18:04 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Tom,
I would like to see a photo please -- no hurry --
Thank you,
Dennis
Dennis Sexton
73 GMC
Germantown, TN
USA
-----Original Message-----
From: Thomas Phipps <tph1pp5@yahoo.com>
To: gmclist@temp.gmcnet.org
Sent: Tue, Oct 12, 2010 6:01 pm
Subject: Re: [GMCnet] Wide Band O2 Sensor Installation
The replacement OEM-style exhaust system from Leigh Harrison has the O2 sensor
ounted on the driver's side, close to the junction of the stock exhaust
anifold and the start of the exhaust tubing. The distance is about 6". This
s the location that he uses with his fuel injection system. If anyone is
nterested, I could post a photo tomorrow. As a note, I have a O2 sensor in
hat bung, but I am not tapping it for any information. I have plans for the
uture, like all GMC owners.
Tom Phipps,
5 GMC Ex-Avion w/Q-Jet.
______________________________________________
MCnet mailing list
ist Information and Subscription Options:
ttp://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Wide Band O2 Sensor Installation [message #102739 is a reply to message #102720] |
Tue, 12 October 2010 19:29 |
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Actually, a 5 wire wideband o2 sensor is self heating, so it being too cold is not really a problem, its getting to hot that shortens its life span. You also have to recalubrate the sensor every 6 months to a year depending on use. This keeps the sensor accurate. Basically you expose the sensor to air and press a calibration button...
| Gail Marks Cruiser wrote on Tue, 12 October 2010 17:27 |
G'day,
Rob you must of been reading my mind.
I have been thinking fitting an air/fuel ratio gauge was the next step in improving the efficiency of our GMC. I too had pondered the best position for the sensor location, having deduced the best option was a sensor on each bank, about 4" after the manifolds.
Two sensors plus dual gauge = lots of dollars.
I have little knowledge of how 02 sensors work, but after a little self education, I had rejected the idea of putting one sensor after the collector thinking it was too "cold" at that point and that readings could be corrupted by the mufflers. Now those who know say one sensor is OK, this project is back on the drawing board.
Does any one out there have an 02 sensor fitted to a GMC with a carb and are they getting usable information from their set-up?
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73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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| Re: [GMCnet] Wide Band O2 Sensor Installation [message #102745 is a reply to message #102727] |
Tue, 12 October 2010 20:13 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Tom,
I would like to see a photo but no need to rush, I won't get around to
installing the sensor until after Helen leaves this coming Sunday.
Thanks,
Rob M.
USAussie
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Thomas Phipps
Sent: Tuesday, October 12, 2010 6:02 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Wide Band O2 Sensor Installation
The replacement OEM-style exhaust system from Leigh Harrison has the O2
sensor mounted on the driver's side, close to the junction of the stock
exhaust manifold and the start of the exhaust tubing. The distance is about
6". This is the location that he uses with his fuel injection system. If
anyone is interested, I could post a photo tomorrow. As a note, I have a O2
sensor in that bung, but I am not tapping it for any information. I have
plans for the future, like all GMC owners.
Tom Phipps,
75 GMC Ex-Avion w/Q-Jet.
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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