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Wideband O2 senser in x-pipe or just behind collector? #603265
02/03/10 11:45 PM
02/03/10 11:45 PM
Joined: Jan 2003
Posts: 10,766
Central Valley, CA.
Quicksilver440 Offline OP
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Quicksilver440  Offline OP
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Joined: Jan 2003
Posts: 10,766
Central Valley, CA.
I'm getting ready to install my new Lc-1 wideband and wondered if I should put the o2 in the x-pipe to read both sides....or in the pipe just behind the collector?

One factor is I have cut-outs before the x-pipe...so it wouldn't work if installed in the x-pipe and I opened the cut-outs. But.......I don't usually open the cutouts.

Also...if I have the cutouts open....how far before the cutout does the sensor need to be to insure that I get good readings?

Re: Wideband O2 senser in x-pipe or just behind collect [Re: Quicksilver440] #603266
02/03/10 11:52 PM
02/03/10 11:52 PM
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joshking440 Offline
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I would venture to say that in the collector itself is the best location. I would also put bungs in bot collectors to periodically check both sides...

Re: Wideband O2 senser in x-pipe or just behind collector? [Re: Quicksilver440] #603267
02/04/10 12:19 AM
02/04/10 12:19 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Quote:

I'm getting ready to install my new Lc-1 wideband and wondered if I should put the o2 in the x-pipe to read both sides....or in the pipe just behind the collector?

One factor is I have cut-outs before the x-pipe...so it wouldn't work if installed in the x-pipe and I opened the cut-outs. But.......I don't usually open the cutouts.

Also...if I have the cutouts open....how far before the cutout does the sensor need to be to insure that I get good readings?




I would try for 12" from the opening if you un cap
but that might not be possible in some cases, do your
work with it closed up if need be... I have a bung
in both collectors and do the tuning then I pull
the o2 and plug the bungs(I cant see keeping the
o2 in when I'm not reading them)

Re: Wideband O2 senser in x-pipe or just behind collector? [Re: MR_P_BODY] #603268
02/04/10 12:24 AM
02/04/10 12:24 AM
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo Offline
Too Many Posts
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Manitoba, Canada
I have my wideband installed in the collector about 1' before the cutout, and at idle/low throttle levels I'm not totally sure the wideband's unaffected by outside air, but the weather started to cool off big time by the time I got the cutouts on there so that no doubt had an effect too.

Re: Wideband O2 senser in x-pipe or just behind collector? [Re: Quicksilver440] #603269
02/04/10 02:20 AM
02/04/10 02:20 AM
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Posts: 15,439
Val-haul-ass... eventually
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BradH Offline
Taking time off to work on my car
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FWIW -- not much, I know -- I'm going to have my O2 sensor installed right smack in the middle of the x pipe.

Re: Wideband O2 senser in x-pipe or just behind collector? [Re: BradH] #603270
02/04/10 03:26 AM
02/04/10 03:26 AM
Joined: Jan 2003
Posts: 10,766
Central Valley, CA.
Quicksilver440 Offline OP
I Live Here
Quicksilver440  Offline OP
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Posts: 10,766
Central Valley, CA.
Thanks for the input guys....I have chrome headers that I was trying to avoid welding on....but I'll see if I can get it more than a foot ahead of the cutouts.....I think I may install one in the x-pipe too...

I have a few spare o2 bungs laying around already. Hopefully my new aluminum fuel tank (bolts in place of the stock tank) will be here by Friday so I can test the O2 out this weekend...

Last edited by Quicksilver440; 02/04/10 03:49 AM.
Re: Wideband O2 senser in x-pipe or just behind collector? [Re: Quicksilver440] #603271
02/04/10 10:32 AM
02/04/10 10:32 AM
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Posts: 1,263
Southwestern Ontario Canada
racealittle Offline
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On my last car, I installed the O2 bung in the center of the X pipe. My cutouts were welded in after the X.

I think that was the best of all worlds since I was running a dual plane RPM intake.

The advantage of having one in each pipe may be necessary for a single plane intake.

Whatever you decide, I found the placement I chose for my situation an absolute asset.


Too many cars, too many parts, too little coin, too little space to work in, too little time left to make it all happen! Update: down to one ride, still too many parts, a little more jingle in the pocket, gaining space, and it's going to happen this year!
Re: Wideband O2 senser in x-pipe or just behind collector? [Re: racealittle] #603272
02/05/10 05:23 AM
02/05/10 05:23 AM
Joined: Feb 2005
Posts: 283
N.E. England
Roppa440 Offline
super street
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N.E. England
If the sensor is heated you can put it where you like.
If it is not heated I would put it as close to the collector as possible without getting in the way of the bolts. But I wouldn't put it actually in the collector as you want to make sure you are measuring an average of all 4 primary pipes.

Also you want to make sure the bung is up in the 10 o'clock or 2 o'clock position if possible so raw fuel or moisture does not effect it.


2002 Chevrolet Corvette 5.7 LS1 2011 Alpha Romeo Giulietta Veloce 1.6 JTD Because running a Mopar in the UK is getting TOO expensive!!
Re: Wideband O2 senser in x-pipe or just behind collector? [Re: Roppa440] #603273
02/05/10 05:54 AM
02/05/10 05:54 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Quote:

If the sensor is heated you can put it where you like.
If it is not heated I would put it as close to the collector as possible without getting in the way of the bolts. But I wouldn't put it actually in the collector as you want to make sure you are measuring an average of all 4 primary pipes.

Also you want to make sure the bung is up in the 10 o'clock or 2 o'clock position if possible so raw fuel or moisture does not effect it.





If you get the sensor too close to the exit you can
get a false reading with air possibly backing up
in the collector

Re: Wideband O2 senser in x-pipe or just behind collector? [Re: MR_P_BODY] #603274
02/05/10 10:10 AM
02/05/10 10:10 AM
Joined: Feb 2005
Posts: 283
N.E. England
Roppa440 Offline
super street
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N.E. England
Quote:


If you get the sensor too close to the exit you can
get a false reading with air possibly backing up
in the collector





Agreed. Which is why when tuning a street car you would push the sensor up the tailpipe a foot or so. But other than that it would not matter except that in the collector you have a small chance of not sampling an even distribution of exhaust content from all four primaries. I haven't personally done any research on this but I assume the people that designed oxygen sensors did.

Obviously if you are running only headers you have no choice (and I would suggest another method of mixture monitoring). But the original poster has an exhaust system.

Last edited by Roppa440; 02/05/10 10:15 AM.

2002 Chevrolet Corvette 5.7 LS1 2011 Alpha Romeo Giulietta Veloce 1.6 JTD Because running a Mopar in the UK is getting TOO expensive!!
Re: Wideband O2 senser in x-pipe or just behind collector? [Re: Roppa440] #603275
02/05/10 10:44 AM
02/05/10 10:44 AM
Joined: Nov 2008
Posts: 833
MN
hemidup Offline
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I use an Inovate wide band with the 02 sensor installed in the collector, however the 02 sensor doesn't last very long cause it doesn't play well with leaded race fuel.


Jerry Williams.
Re: Wideband O2 senser in x-pipe or just behind collector? [Re: hemidup] #603276
02/05/10 08:45 PM
02/05/10 08:45 PM
Joined: Jan 2007
Posts: 153
Wpg, Mb, Canada
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six-barrel Offline
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Supposedly the NTK sensors would last longer than Bosch with leaded fuel.

Anyone running NTK's care to comment?







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