Where should I mount my Wideband Sensor on the downpipe?

I know that due to the nature of O2 sensors in general it can't be near the stock O2 sensor.

I want it to read both banks, I have thought of just putting it where the EGR is but then it's just reading the rear bank.

any help would be much appreciated!!

Steve

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Sensor must be mounted between the engine and the catalytic converters (in application where they are used). If no catalytic converters are used, then the sensor should be close to the hedder collector, where the exhaust is hot and each cylinder is represented.

The O2 sensor must be installed in the side or top of the exhaust pipe. The installation angle of the wideband O2 sensor should be inclined at least 10? towards horizontal (electrical connection upwards). Thus preventing the collection of liquids between sensor housing and sensor element during the cold start phase.

Tightening torque: 40-60 Nm (29-44 ft-lbs). Material characteristics and strength of the thread must be appropriate.

On turbo applications install the sensor after the turbo and before the catalytic converter. The high exhaust pressure before the turbo interferes with the measurement and the high exhaust temperatures encountered can damage the sensor.

Most factory O2 sensor locations are acceptable for the wideband sensor but be sure they follow the general guidelines above. If you require a bung to weld in the exhaust they are available from K&N - part # 85-21688. Bung specifications are also given in this drawing from Bosch.

Under-floor installation of the sensor at a distance from the engine requires an additional check of the following points: a) positioning of the sensor with respect to stone impact hazard, b) positioning and fixing of cable and connector with respect to mechanical damage, cable bending stress and thermal stress. The sensor must not be exposed to strong mechanical shocks (e.g. while the sensor is installed). Otherwise the sensor element may crack without visible damage to the sensor housing.

Hope this helps

quote Originally posted by revin: Sensor must be mounted between the engine and the catalytic converters (in application where they are used). If no catalytic converters are used, then the sensor should be close to the hedder collector, where the exhaust is hot and each cylinder is represented. The O2 sensor must be installed in the side or top of the exhaust pipe. The installation angle of the wideband O2 sensor should be inclined at least 10? towards horizontal (electrical connection upwards). Thus preventing the collection of liquids between sensor housing and sensor element during the cold start phase. Tightening torque: 40-60 Nm (29-44 ft-lbs). Material characteristics and strength of the thread must be appropriate. On turbo applications install the sensor after the turbo and before the catalytic converter. The high exhaust pressure before the turbo interferes with the measurement and the high exhaust temperatures encountered can damage the sensor. Most factory O2 sensor locations are acceptable for the wideband sensor but be sure they follow the general guidelines above. If you require a bung to weld in the exhaust they are available from K&N - part # 85-21688. Bung specifications are also given in this drawing from Bosch. Under-floor installation of the sensor at a distance from the engine requires an additional check of the following points: a) positioning of the sensor with respect to stone impact hazard, b) positioning and fixing of cable and connector with respect to mechanical damage, cable bending stress and thermal stress. The sensor must not be exposed to strong mechanical shocks (e.g. while the sensor is installed). Otherwise the sensor element may crack without visible damage to the sensor housing. Hope this helps

I've already seen this description. Thanks though!!

I want to know exactly "WHERE" to mount it in relation the the stock O2 sensor. I.E.- before of after, and how many inches away from the stock O2 sensor.
I know to mount it on the downpipe before the Cat (I don't have a Cat...lol)

I don't think there is a critical dimension to closeness to the stock O2. Off course not next to it (< 1") and in a way that the stock one may disrupt flow. In my old 3.4 car I installed it low on the down pipe to have easy access to plug the wide band sensor and in a way that I could run the wide band wire to the top without touching hot parts.

your wide band sensor should be a heated sensor.. you can put it anywhere you want.. if you want to read both banks seperately. at the same time, you need two wide band, one per bank..
anywhere infront of your converter is fair game.. and 8" from y pipe joint..

quote Originally posted by Alex4mula: I don't think there is a critical dimension to closeness to the stock O2. Off course not next to it (< 1") and in a way that the stock one may disrupt flow. In my old 3.4 car I installed it low on the down pipe to have easy access to plug the wide band sensor and in a way that I could run the wide band wire to the top without touching hot parts.

thanks Alex!
I'll put it down stream of the stock O2 location before the joint.
luckily I have a pre-88 downpipe on my 88 on my 3.4L so I have a little bit extra pipe there.

if you are using a "normal" narrowband o2 location on a 3800... I can easily say that you want your wideband about 24 inches back.... You want it fairly well downstream of everything.

I'm also interested in this subject.

quote Originally posted by darkhorizon: if you are using a "normal" narrowband o2 location on a 3800... I can easily say that you want your wideband about 24 inches back.... You want it fairly well downstream of everything.

So basically right before the muffler (if you have one)