Exhaust sensor - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Iceburgh · 01-20-2014, 09:57 PM

How far away from the engine does this have to be......looking at shorty headers for clearance but not sure if the bung can go in there or should I look for long tubs that will fit.....not sure they are out there

mcfarlnd · 01-21-2014, 12:57 AM

If you are talking about o2 sensors, I recommend just down stream of the collector regardless of long tube or shorties. I have long tubes that have them mounted in the aft primary tubes on each bank and the ECM don't like it. When I log on hp tuners, they aren't a smooth switching pattern like when I have them after the collector.

**Hart_Rod** · 01-21-2014, 12:12 PM

+1

Andy4639 · 01-22-2014, 03:01 AM

Headers on my 6.0. I don't think it matters on the distance on a heated senor. The older ones that weren't heated I think it did though.

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ls1nova71 · 01-22-2014, 05:32 AM

Generally the closer to the engine the better, and between the 9 o'clock and 3 o'clock position so that condensation doesn't sit in them.

crazy longhorn · 01-26-2014, 07:44 PM

20" , from the head pipe to sensor, is what I got today on the the hotrod shows? That sounds about right, as looking at the stock setup....Longhorn

Iceburgh · 01-26-2014, 10:08 PM

Quote:

Originally Posted by crazy longhorn

20" , from the head pipe to sensor, is what I got today on the the hotrod shows? That sounds about right, as looking at the stock setup....Longhorn

Thanks for the info

BR3W CITY · 01-27-2014, 03:24 AM

20" is a ballpark, but it works. Usually the idea is to have it a far "up" as you can, while still being in the collector so ALL the exhaust can mix before/while passing the sensor. This is for "normal" manifolds that bolt to a "mid" pipe, or on full length headers at the collector.

Mounting it too close to the exhaust ports (like on a short header setup), will put an extra amount of heat load (direct and indirect) on the sensors. The sensor can burn out faster and is more prone to erratic/false readings, and I wouldn't be surprised if the difference in exhaust pulse very close to the heads had an effect as well.
Too far away and you have the exhaust cooling down, as well as an increased likely hood that a clean air leak can occur before the sensor throwing off readings.

01-20-2014, 09:57 PM	#1
Iceburgh Registered User Join Date: Jan 2014 Location: New Bloomfield pa. Posts: 644	Exhaust sensor How far away from the engine does this have to be......looking at shorty headers for clearance but not sure if the bung can go in there or should I look for long tubs that will fit.....not sure they are out there

01-21-2014, 12:57 AM	#2
mcfarlnd Registered User Join Date: Jul 2011 Location: Texan living in Point Mugu, CA Posts: 82	Re: Exhaust sensor If you are talking about o2 sensors, I recommend just down stream of the collector regardless of long tube or shorties. I have long tubes that have them mounted in the aft primary tubes on each bank and the ECM don't like it. When I log on hp tuners, they aren't a smooth switching pattern like when I have them after the collector.

01-21-2014, 12:12 PM	#3
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,858	Re: Exhaust sensor +1 __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3

01-22-2014, 03:01 AM	#4
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Exhaust sensor Headers on my 6.0. I don't think it matters on the distance on a heated senor. The older ones that weren't heated I think it did though. [IMG][/IMG] __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

01-22-2014, 05:32 AM	#5
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: Exhaust sensor Generally the closer to the engine the better, and between the 9 o'clock and 3 o'clock position so that condensation doesn't sit in them. __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

01-26-2014, 07:44 PM	#6
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Re: Exhaust sensor 20" , from the head pipe to sensor, is what I got today on the the hotrod shows? That sounds about right, as looking at the stock setup....Longhorn __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

01-27-2014, 03:24 AM	#8
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Exhaust sensor 20" is a ballpark, but it works. Usually the idea is to have it a far "up" as you can, while still being in the collector so ALL the exhaust can mix before/while passing the sensor. This is for "normal" manifolds that bolt to a "mid" pipe, or on full length headers at the collector. Mounting it too close to the exhaust ports (like on a short header setup), will put an extra amount of heat load (direct and indirect) on the sensors. The sensor can burn out faster and is more prone to erratic/false readings, and I wouldn't be surprised if the difference in exhaust pulse very close to the heads had an effect as well. Too far away and you have the exhaust cooling down, as well as an increased likely hood that a clean air leak can occur before the sensor throwing off readings. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

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