Sensor Placement

Codeman · February 10th, 2011, 05:16 PM

Ok well I was talking in class today with my teacher about O2 sensors. And he was asking me about my wideband in my car. He asked where I placed it and I placed it after the cat in the rear O2 spot since I have my rear O2s shut off. He didn't understand how it would read the right amount of oxygen since the cat would be changing the exhaust mixture.

I didn't have a good answer. Is it ok to put it after the cat or should I move it? It seems to read just fine. I just want to kind of figure out why it doesn't matter so I can tell him.

Thanks.

Matt. · February 10th, 2011, 07:01 PM

The cats might alter it a little but you should still get a good reading , I would go for the precat sensors to be safe , or better yet get longtubes and throw out the cats

6ER THEN I 8ER! · February 10th, 2011, 07:03 PM

not haveing it close to the precat location can cause idleing issues down the road..can cause your car to run lean or rich...at least that's what i've noticed from putting the midpipe on my car and a few of the v6 guys as of late..i can understand your teachers confusion

ESG-642T · February 10th, 2011, 08:38 PM

Wideband is supposed to be before the cats.

mp4 player · February 10th, 2011, 08:48 PM

Before the cats would be the correct place to put it.

I actually asked my tuner the same question since he was pulling the AF ratio from after my cats. His response was that 10yo cats won't be doing much to alter it but he's aware that he might have to adjust for them a little.

It ended up his after cat reading was very, very close to my wideband reading that is installed pre-cats.

Codeman · February 11th, 2011, 09:20 AM

Ok thanks, I thought that it seemed weird. I wasn't really thinking at the time of installation. I just remembered someone saying they put it in the rear o2 spot. Ok well I will have to move that around after I do my cam so I can get a correct reading for datalogging. Thanks.

And I plan on maybe getting headers this summer if not maybe in the winter we will see how funds are.

February 10th, 2011, 05:16 PM	#1
Codeman Hardcore Enthusiast Join Date: Nov 2007 Location: North Dakota Posts: 2,933 iTrader: 1 reviews	Sensor Placement Ok well I was talking in class today with my teacher about O2 sensors. And he was asking me about my wideband in my car. He asked where I placed it and I placed it after the cat in the rear O2 spot since I have my rear O2s shut off. He didn't understand how it would read the right amount of oxygen since the cat would be changing the exhaust mixture. I didn't have a good answer. Is it ok to put it after the cat or should I move it? It seems to read just fine. I just want to kind of figure out why it doesn't matter so I can tell him. Thanks. __________________ UDP, CAI, True Duals, LTs, 91 Tune from TT, 3.73 gears, Tlok,Windstar upper, GT TB, Ported lower, Comp 218/226 cam, FRPP C Springs, J&M LCA, Tokico Blue shocks and struts, and J&M Full Length Subframe Connectors

February 10th, 2011, 07:01 PM	#2
Matt. Hardcore Enthusiast 2002 Nitrous Injected V6 12's? Join Date: Oct 2009 Location: Chester County, PA Posts: 2,414 iTrader: 0 reviews	The cats might alter it a little but you should still get a good reading , I would go for the precat sensors to be safe , or better yet get longtubes and throw out the cats __________________ Project Red Magic -Full Intake, Full Exhuast,Geared, Tune, Sprayed, Dropped- -18 Inch Hypercoated Saleens wrapped in Nittos-

February 10th, 2011, 08:38 PM	#4
ESG-642T [8MINUS2] 2002, Ford, v6 Join Date: Feb 2007 Location: TEXAS Posts: 12,319 iTrader: 0 reviews	Wideband is supposed to be before the cats. __________________ Hi, You can call me Kyle Random ESG fact: Had a prochamber on his v6 before it was popular. WTB: v6 BBK valve covers

February 10th, 2011, 08:48 PM	#5
mp4 player Hardcore Enthusiast '00 V6 Procharged Mustang Join Date: Feb 2008 Location: WA Posts: 1,345 iTrader: 1 reviews	Before the cats would be the correct place to put it. I actually asked my tuner the same question since he was pulling the AF ratio from after my cats. His response was that 10yo cats won't be doing much to alter it but he's aware that he might have to adjust for them a little. It ended up his after cat reading was very, very close to my wideband reading that is installed pre-cats. __________________ 2000 Prochaged V6. T-lok, Mach 1 takeoff exhaust with H-pipe, 20% tint, OEM fogs and all HIDs. SAE Corrected: 289HP/298TQ at 5100RPM(Pegged MAF).

February 11th, 2011, 09:20 AM	#6
Codeman Hardcore Enthusiast Join Date: Nov 2007 Location: North Dakota Posts: 2,933 iTrader: 1 reviews	Ok thanks, I thought that it seemed weird. I wasn't really thinking at the time of installation. I just remembered someone saying they put it in the rear o2 spot. Ok well I will have to move that around after I do my cam so I can get a correct reading for datalogging. Thanks. And I plan on maybe getting headers this summer if not maybe in the winter we will see how funds are. __________________ UDP, CAI, True Duals, LTs, 91 Tune from TT, 3.73 gears, Tlok,Windstar upper, GT TB, Ported lower, Comp 218/226 cam, FRPP C Springs, J&M LCA, Tokico Blue shocks and struts, and J&M Full Length Subframe Connectors

February 10th, 2011, 07:03 PM	#3
6ER THEN I 8ER! Banned Join Date: Apr 2007 Location: Portland, TN Posts: 17,515 iTrader: 3 reviews	not haveing it close to the precat location can cause idleing issues down the road..can cause your car to run lean or rich...at least that's what i've noticed from putting the midpipe on my car and a few of the v6 guys as of late..i can understand your teachers confusion

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