O2's in collectors

gmonde · 08-19-2019, 06:51 PM

under full throttle (2 step,leave ,pull thru the gears) your o2's will read .50-.75 leaner than if you had a full exhaust,, I am 12.5 - 13.0 between the left and right side banks ,now if I moved the o2 up to the primary tubes it will be richer but only measure that one tube ,but it will be more of accurate #,, so its a test and tune deal ,,you have to dial your et vs you afr = et and mph ,yeah 12.5 is your target but its subject to how your combo reacts (that my take on my set up)
tom goldman has some experience in this wheel house

ss3011 · 08-19-2019, 09:43 PM

If your collectors slide on to the primary tubes , you might get a lot of air coming through the gaps . That really messes up the readings at all rpms .

Hacksaw · 08-20-2019, 11:41 AM

OK: Thanks for the replies.

Matt S · 08-20-2019, 08:27 PM

For those that may have the slip-on collectors and wish to install an O2 sensor in them, what is the consensus on sealing the collectors to the primary tubes with an extreme high temperature sealant, such as this:

https://www.fluidsealingsupply.com/d...RoC5JoQAvD_BwE

I'm guessing that one downside would be that the slip-on collectors would then be much harder to install or remove from the primaries.

HR9121 · 08-20-2019, 09:40 PM

All good information above but what I was told to be more concerned with getting it in the proper position behind the merge 6 to 8" would be much more important.

pfordamx · 08-21-2019, 08:49 PM

does the # matter that much as long as its consistent enough to see change once you know what the engine likes you can adjust to that. i always think of it as a tool to better understand how changes and weather effect the car and not to chase a magic #

Darrel Goheen · 08-24-2019, 12:29 AM

Put the O2 in a primary tube and it works great all the time except if there is an issue with that cylinder. I originally had mine in a collector and continually fought it. Moved it to a primary a couple years ago and never have a problem.

08-19-2019, 06:51 PM	#1
gmonde Senior Member Join Date: Nov 2007 Posts: 615 Likes: 56 Liked 165 Times in 59 Posts	Re: O2's in collectors under full throttle (2 step,leave ,pull thru the gears) your o2's will read .50-.75 leaner than if you had a full exhaust,, I am 12.5 - 13.0 between the left and right side banks ,now if I moved the o2 up to the primary tubes it will be richer but only measure that one tube ,but it will be more of accurate #,, so its a test and tune deal ,,you have to dial your et vs you afr = et and mph ,yeah 12.5 is your target but its subject to how your combo reacts (that my take on my set up) tom goldman has some experience in this wheel house

08-19-2019, 09:43 PM	#2
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: O2's in collectors If your collectors slide on to the primary tubes , you might get a lot of air coming through the gaps . That really messes up the readings at all rpms .

08-20-2019, 11:41 AM	#3
Hacksaw Senior Member Join Date: Sep 2016 Posts: 882 Likes: 206 Liked 310 Times in 174 Posts	Re: O2's in collectors OK: Thanks for the replies.

08-20-2019, 08:27 PM	#4
Matt S Junior Member Join Date: Apr 2006 Posts: 98 Likes: 0 Liked 20 Times in 12 Posts	Re: O2's in collectors For those that may have the slip-on collectors and wish to install an O2 sensor in them, what is the consensus on sealing the collectors to the primary tubes with an extreme high temperature sealant, such as this: https://www.fluidsealingsupply.com/d...RoC5JoQAvD_BwE I'm guessing that one downside would be that the slip-on collectors would then be much harder to install or remove from the primaries.

08-20-2019, 09:40 PM	#5
HR9121 Live Reporter Join Date: Jan 2011 Location: New Bern, NC Posts: 3,467 Likes: 146 Liked 3,363 Times in 731 Posts	Re: O2's in collectors All good information above but what I was told to be more concerned with getting it in the proper position behind the merge 6 to 8" would be much more important. __________________ James Williamson W200 J/SA. SS/JA

08-21-2019, 08:49 PM	#6
pfordamx Member Join Date: Sep 2011 Location: Oklahoma City, OK Posts: 214 Likes: 3 Liked 7 Times in 5 Posts	Re: O2's in collectors does the # matter that much as long as its consistent enough to see change once you know what the engine likes you can adjust to that. i always think of it as a tool to better understand how changes and weather effect the car and not to chase a magic #

08-24-2019, 12:29 AM	#7
Darrel Goheen Member Join Date: Jan 2011 Location: Hays, KS Posts: 380 Likes: 226 Liked 70 Times in 31 Posts	Re: O2's in collectors Put the O2 in a primary tube and it works great all the time except if there is an issue with that cylinder. I originally had mine in a collector and continually fought it. Moved it to a primary a couple years ago and never have a problem. __________________ Darrel Goheen 785-623-7021 Stock Eliminator 585 94 Camaro Z/28 LT1/ET 585 67 Chevelle 427 Tehnician for JustAnswer.com