Mounting o2 Sensor

[hEaT]

Question, how much of the sensor itself needs to be exposed to the exhaust stream? Can any be shrouded by the bung?

This is a single wire narrowband mounted 4" post-turbo.

[FordFociSHO]

In a perfect world the sensor should read as close to the center of the exhaust flow as possible, should be the fastest of the flow and therefore make the sensor read quicker and the fuel/spark react quicker.

But in reality with a 1 wire, who really cares. lol Big step back in technology there.

Why a 1 wire if I may?

[hEaT]

It's on my Merkur and it's the factory (new anyway) Bosch one-wire sensor. The bung I bought is pretty big and covers about half the sensor. I think I'm going to cut the bung since the factory one puts the whole sensor into the flow.

Thanks for the tips on the placement. I'll be putting it dead center right on the outside radius of the 90* bend off the turbo. Should be the fastest and hottest area.

The car runs decent with the one-wire, just takes a few minutes to heat up. Maybe down the road I'll swap it for a heated unit, but I'll have to move it down the exhaust flow so I don't burn it up.

[FordFociSHO]

Idea #2,

Run the car off a wideband. If you get one with an analog output you can use that to feed info to the stock ECU.
That's how I'm running my Focus right now and I love it, power smoothed out. Not more power but more even power it seems.

Being a WBO2 should be standard equipment on any F/I car makes the most sense to me.

[hEaT]

Yeah, it's my next step mod-wise. I know the car is running quite rich (was almost 10:1 in boost last time I looked with the stock ECU/air meter). I've changed a bit since then and I would really like to get an adjustable fuel pressure regulator to dial the fuel in.