O2 Sensor Questions

LukaDuke15 · 10-18-2009, 07:12 PM

I have a truck that I am swapping a 3.4l into. I am running true dual exhaust so there is no Y-Pipe or catalytics converters. Do I need to run two O2 Sensors? and if i do where would be the best place to find them for good price?

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lbhsbz · 10-19-2009, 06:52 PM

The ECM uses one sensor to adjust the fuel trims for both banks. If you only run one sensor, it's input will only come from one bank. I would try to run an X-pipe at least and put the sensor there, but it's got to be pretty close to the heads...I'd say not more than 2 feet downstream or else the readings may be screwed up. For the post cat sensor, you can get one of those simulators that they sell at jegs.

Why not run a single exhaust? This ain't a small block chevy, it's a toyota.

LukaDuke15 · 10-19-2009, 07:52 PM

Thanks for the info. I was going to run the single exhaust but the crossover pipe would not fit because of where the motor is mounted. I also have not seen a truck that runs true dual exhaust so i wanted be unique and see how the truck runs and sounds.

lbhsbz · 10-20-2009, 05:08 PM

I'll take some pics of my setup tonight...I made the crossover come underneith the bellhousing.

I've also got a set of Downey headers for sale if you don't feel like building stuff.

LukaDuke15 · 10-22-2009, 10:33 AM

Very cool I'll take a look tonight. Another question if I'm not running a catalytic what should i run for an after catalytic o2 sensor because it wont read a difference because there is no cat. So should i run two of the pre-catalytic o2 sensors or should i get an o2 sensor simulator and run an after catalytic sensor?

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10-19-2009, 06:52 PM	#2 (permalink)
lbhsbz Registered User Join Date: Oct 2007 Posts: 36	The ECM uses one sensor to adjust the fuel trims for both banks. If you only run one sensor, it's input will only come from one bank. I would try to run an X-pipe at least and put the sensor there, but it's got to be pretty close to the heads...I'd say not more than 2 feet downstream or else the readings may be screwed up. For the post cat sensor, you can get one of those simulators that they sell at jegs. Why not run a single exhaust? This ain't a small block chevy, it's a toyota.

10-19-2009, 07:52 PM	#3 (permalink)
LukaDuke15 Registered User Join Date: Mar 2009 Location: Camarillo, Ca Posts: 12	Thanks for the info. I was going to run the single exhaust but the crossover pipe would not fit because of where the motor is mounted. I also have not seen a truck that runs true dual exhaust so i wanted be unique and see how the truck runs and sounds.

10-20-2009, 05:08 PM	#4 (permalink)
lbhsbz Registered User Join Date: Oct 2007 Posts: 36	I'll take some pics of my setup tonight...I made the crossover come underneith the bellhousing. I've also got a set of Downey headers for sale if you don't feel like building stuff.

10-22-2009, 10:33 AM	#5 (permalink)
LukaDuke15 Registered User Join Date: Mar 2009 Location: Camarillo, Ca Posts: 12	Very cool I'll take a look tonight. Another question if I'm not running a catalytic what should i run for an after catalytic o2 sensor because it wont read a difference because there is no cat. So should i run two of the pre-catalytic o2 sensors or should i get an o2 sensor simulator and run an after catalytic sensor?