O2 sensor placement on a Banana can Options

[aircooledtechguy]

So,. . . My header/muffler system on my shop-car works flawlessly and actually sounds really good too. However, I REALLY love the sound of the Porsche banana can muffs. So I'm thinking of converting my shop-car to a banana can muffler. Switching could also eliminate the occasional dragging of the muffler coming out of steep parking lots. The big issue though is where would I end up mounting the O2 bung so it will read correctly?? I'm thinking that with a muffler like this one below, over on the right side (closest end) near the end would be a good spot. . . What say you??

[Mike Bellis]

Theoretically speaking, The O2 optimum location is 12" from the exhaust port. This is especially important if you are using a non heated sensor. If your exhaust merges into 1 inlet to the muffler, place it there. If you have dual inlets to the muffler, place it on the outlet as I described above. If you use either a wide band (best) or a heated sensor, the outlet is fine. If you run a non heated sensor, it may tank up to 20-30 minutes run time to get an accurate reading. The exhaust has to heat up the sensor.

I'm not an expert in that muffler but I have installed plenty of 02 sensors on custom EFI systems. You need to capture all of the cylinders with your sensor or your not going to get good readings. You could have one cylinder go lean and never know it.

If you use a narrow band sensor, the reading at Stioch will bounce back and forth from rich to lean. This is why a wide band is best. You will get a true reading above and below Stioch with a wide band.