O2 sensor mounting?
Thread Starter
Burning Brakes
Joined: Dec 2002
Posts: 947
Likes: 0
From: Middletown N.Y.
O2 sensor mounting?
I 'm ready to install super comp hooker headers on my 89 (1 3/4" no air injection fittings) and was wondering where was the best place to mount my A/F ratio O2. The headers came with one sensor mount on, I believe, the # 7 or 5 cylinder .I'm not sure if this is the optimal spot for the A/F O2 and I kinda regret not welding other fittings before I had them coated. Anyway what's the best spot? :confused:
Race Director
Joined: Feb 2002
Posts: 11,268
Likes: 14
From: Honolulu, HI
Re: O2 sensor mounting? (JUAN J SANCHEZ)
Are these just the stock O2 sensors you're talking about? Or an aftermarket 3 wires O2 sensor for your gauge???
1.) I've heard the best place is in the leanest cylinder.
2.) If it's a 5 wire wide band O2 sensor then I've seen them in the collector.
I'm no expert though.
1.) I've heard the best place is in the leanest cylinder.
2.) If it's a 5 wire wide band O2 sensor then I've seen them in the collector.
I'm no expert though.
Thread Starter
Burning Brakes
Joined: Dec 2002
Posts: 947
Likes: 0
From: Middletown N.Y.
Re: O2 sensor mounting? (vvv90)
It's for my 5-wire tuning O2 sensor . I made the mistake of sending my headers to get coated before I welded extra O2 nuts in the collectors and possibly in all the cylinders. I'm considering selling my 1 3/4" super comp Hookers (new in the box) and purchasing another set and welding on the O2 fittings. It would have to be a quick turn around because I'm ready to install my engine . Anyway, I'd like to know what the leanest cylinders usually are on a small block or at least get an idea, I know this is probably not possible without actually checking a running motor. :confused:
Race Director
Joined: Feb 2002
Posts: 11,268
Likes: 14
From: Honolulu, HI
Re: O2 sensor mounting? (JUAN J SANCHEZ)
I asked the same question when about installing my EGT and was told the leanest cylinders are usually the back ones. 1 or 8. As for your Wide band 02, I've only seen them in the collector. Even though you got your coated, you won't be able to see the sensor in the collector under the car. Or am I confused? :confused:
I don't see any reason for ever putting a bung in every cylinder. Unless you're going to run 8 wide band 02 sensors :crazy: :crazy: That would be cool though :thumbs:
I don't see any reason for ever putting a bung in every cylinder. Unless you're going to run 8 wide band 02 sensors :crazy: :crazy: That would be cool though :thumbs:
Thread Starter
Burning Brakes
Joined: Dec 2002
Posts: 947
Likes: 0
From: Middletown N.Y.
Re: O2 sensor mounting? (vvv90)
If welding a O2 nut in my collectors wouldn't cause the coating to chip away or have any other negative affect I will weld right over it. I haven't had time to look into it but I will. The reason for the extra O2 nuts is because once I get the A/F right with the sensor in the collector I can go back and switch positions and check what cylinders are actually richer or leaner. Perhaps I'll switch to a sequential box and the extra O2 nuts will help me tune easier. Just trying to learn as much as possible. I'm not too concerned with what the headers look like, mostly just trying not to screw up $300 worth of coating.
Race Director
Joined: Feb 2002
Posts: 11,268
Likes: 14
From: Honolulu, HI
Re: O2 sensor mounting? (JUAN J SANCHEZ)
I would contact Jet-Hot and ask them. I don't see a problem though with just tig welding some nuts on.
I would be great for sequential though I'm not sure how it would affect the dynamics of live WOT tuning the the DFI/FAST box will do when you have the O2 permanently mounted. It might be good for trouble shooting purposes.
The ultimate setup would be a Sequential system that could read 8 wideO2's :D :thumbs:
I would be great for sequential though I'm not sure how it would affect the dynamics of live WOT tuning the the DFI/FAST box will do when you have the O2 permanently mounted. It might be good for trouble shooting purposes.
The ultimate setup would be a Sequential system that could read 8 wideO2's :D :thumbs:
Racer
Joined: Apr 2003
Posts: 337
Likes: 0
From: OLD DIRTY BASTARD LIVE AND UNCUT
Re: O2 sensor mounting? (JUAN J SANCHEZ)
just plug the hole in the #7 header with a old o2 or such and get some stainless steel header collectors with a built in o2 bung.
problem solved.
you can get em from Jegs, Summit, etc. that have the 3 bolt flange to match the hooker.
I run hookers too and have stainless steel header collectors with my o2 there. Mine are 3" to 3"
Problem solved.
:party:
problem solved.
you can get em from Jegs, Summit, etc. that have the 3 bolt flange to match the hooker.
I run hookers too and have stainless steel header collectors with my o2 there. Mine are 3" to 3"
Problem solved.
:party:
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Racer
Joined: Apr 2003
Posts: 337
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From: OLD DIRTY BASTARD LIVE AND UNCUT
Re: O2 sensor mounting? (reallycoolcorvette)
http://www.jegs.com/cgi-bin/ncommerc...50&prmenbr=361
the pic does not show the o2 fitting but it is there. they come in different sizes too.
:chevy
*EDIT*
I do use soft aluminun gaskets and red high temp rtv for a air tight seal w/o any air leaks. This is essential since the o2 is located after the flange/mating of the two.
[Modified by reallycoolcorvette, 12:21 AM 7/19/2003]
the pic does not show the o2 fitting but it is there. they come in different sizes too.
:chevy
*EDIT*
I do use soft aluminun gaskets and red high temp rtv for a air tight seal w/o any air leaks. This is essential since the o2 is located after the flange/mating of the two.
[Modified by reallycoolcorvette, 12:21 AM 7/19/2003]
Drifting
Joined: Jul 2001
Posts: 1,897
Likes: 0
From: La Fontaine Indiana
Re: O2 sensor mounting? (reallycoolcorvette)
http://www.jegs.com/cgi-bin/ncommerc...50&prmenbr=361
the pic does not show the o2 fitting but it is there. they come in different sizes too.
:chevy
*EDIT*
I do use soft aluminun gaskets and red high temp rtv for a air tight seal w/o any air leaks. This is essential since the o2 is located after the flange/mating of the two.
[Modified by reallycoolcorvette, 12:21 AM 7/19/2003]
the pic does not show the o2 fitting but it is there. they come in different sizes too.
:chevy
*EDIT*
I do use soft aluminun gaskets and red high temp rtv for a air tight seal w/o any air leaks. This is essential since the o2 is located after the flange/mating of the two.
[Modified by reallycoolcorvette, 12:21 AM 7/19/2003]
http://www.jegs.com/cgi-bin/ncommerc...50&prmenbr=361
the pic does not show the o2 fitting but it is there. they come in different sizes too.
:chevy
*EDIT*
I do use soft aluminun gaskets and red high temp rtv for a air tight seal w/o any air leaks. This is essential since the o2 is located after the flange/mating of the two.
[Modified by reallycoolcorvette, 12:21 AM 7/19/2003]
the pic does not show the o2 fitting but it is there. they come in different sizes too.
:chevy
*EDIT*
I do use soft aluminun gaskets and red high temp rtv for a air tight seal w/o any air leaks. This is essential since the o2 is located after the flange/mating of the two.
[Modified by reallycoolcorvette, 12:21 AM 7/19/2003]
Be sure the rtv you buy is O2 sensor safe. If you use the wrong kind and put it on a valve cover gasket the silicone fumes will be drawin through the pcv into the intake and ruin the O2 sensor gotta be careful about what kind you use. :yesnod:
[Modified by black bart, 8:58 PM 7/21/2003]
