http://www.daddysscp.com/dcart4/product_image.php?imageid=21

Ok, so this will be the only cat in my system, and I would like to have a permanant wideband bung...
Since the bung for the stock rear sensor is before the cat, and there are no cats upstream, should I use the bung that is shown in the picture (in front of the cat) for the wideband, and put another bung for the stock o2 behind the cat, or just add another bung a few inches away but still before the cat?

put the wideband in the downpipe instead of the midpipe.

I would go as far downstream as you can go, yet in front of the first cat.

Moving the sensor downstream will prolong sensor life due to cooler operating temps. Your exhaust flow speed should still be fast enough to make the sensor track the engine closer in time than a log can show.

I would go as far downstream as you can go, yet in front of the first cat.

Moving the sensor downstream will prolong sensor life due to cooler operating temps. Your exhaust flow speed should still be fast enough to make the sensor track the engine closer in time than a log can show.

The bung that came in the stromung unit is in front of the cat, much as it is in the stock 3rd cat (why did subaru do it that way?).

I think I'll go with putting another bung behind the cat for the stock rear sensor...hope the wires will reach:rolleyes: should be like another 8" further back.

Correct me if I'm wrong for your year, but won't you need a bung in front of the cat for the stock front sensor, a bung behind the cat for the stock rear sensor, and a bung in front of the cat for the WBO2?

No, you're not wrong.
Front stock o2 sensor is up in the manifold, before the turbo, and will remain there...

Ahh, ok.

The bung that came in the stromung unit is in front of the cat, much as it is in the stock 3rd cat (why did subaru do it that way?).

I think I'll go with putting another bung behind the cat for the stock rear sensor...hope the wires will reach:rolleyes: should be like another 8" further back.

bad-bad idea m8

the wb bung should ALWAYS be before any 'cat' and most feel that 8-12 inches after the turbo in the dp is best

i agree

bad-bad idea m8

the wb bung should ALWAYS be before any 'cat' and most feel that 8-12 inches after the turbo in the dp is best

i agree
Except for Innovate. You know, the people who actually make the sensor.

Except for Innovate. You know, the people who actually make the sensor.


http://www.innovatemotorsports.com/support/manual/LM1_Manual.pdf


On TURBO CHARGED vehicles:
Bung: Install the bung downstream from the turbo before the catalytic
converter. The high exhaust pressure before the turbo interferes with
the lambda measurement and the high exhaust temperatures
encountered there can damage the sensor.

Yes, and if you read the section in one of their manuals (obviously must not be the LM manual) suggests mounting more than just after the turbo. They suggest mounting farther downstream to lower operating temperatures and extend sensor life.

Basically, the farther away from the turbo, the longer the sensor will last and the more accurately it will read. The closer to the turbo, the smaller the offset in time between what the engine is actually doing and what is being measured.

Like everything, it's a compromise. Considering that Innovate actually supports tailpipe readings in cars without cats, barely upstream of the 1st cat strikes me as a reasonable compromise.

http://www.innovatemotorsports.com/support/manual/LM1_Manual.pdf


On TURBO CHARGED vehicles:
Bung: Install the bung downstream from the turbo before the catalytic
converter. The high exhaust pressure before the turbo interferes with
the lambda measurement and the high exhaust temperatures
encountered there can damage the sensor.

Yes, and if you read the section in one of their manuals (obviously must not be the LM manual) suggests mounting more than just after the turbo. They suggest mounting farther downstream to lower operating temperatures and extend sensor life.

Basically, the farther away from the turbo, the longer the sensor will last and the more accurately it will read. The closer to the turbo, the smaller the offset in time between what the engine is actually doing and what is being measured.

Like everything, it's a compromise. Considering that Innovate actually supports tailpipe readings in cars without cats, barely upstream of the 1st cat strikes me as a reasonable compromise.

http://www.innovatemotorsports.com/support/manual/LM1_Manual.pdf


The maximum temperature of the sensor at the bung (the sensor hexagon)
should not exceed 500 o C or 900 o F. If these temperatures are exceeded in your
application you should either install a copper heat sink (instructions below) or the
Innovate Motorsports Heat-Sink Bung extender (HBX-1).
The bung extender is recommended for situations where airflow is restricted or
the encountered heat is higher than a heat sink can handle.
3.2. How to fabricate a copper heat sink
Use a 4” x 4” (10cm x 10 cm) sheet of copper sheet metal 14ga (1.5mm) thick. Drill a hole in the
center with the same diameter of the oxygen sensor threads ~3/4” (19mm).
Fold the sides up 45 deg and mount it between the sensor and the bung like you would a big
washer. Orient it such that the sides are exposed to good airflow.