The Great Bungholio, Where to stick it |
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The Great Bungholio, Where to stick it |
Porschef |
Aug 30 2014, 01:25 PM
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#1
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How you doin' Group: Members Posts: 2,175 Joined: 7-September 10 From: LawnGuyland Member No.: 12,152 Region Association: North East States |
My AFR gauge arrived yesterday and I was all amped to install it today. A few weeks back when I installed the sway bars I welded in a bung for the O2 sensor in the stock Leistritz muffler in anticipation of this day, however, it appears I may haven't enough room to install the sensor without cutting sheet metal.
Ain't gonna do that. The kit includes a bung so I'll just abandon the prior unit with it's plug, and weld in the new one (Oh Paul, where art thou ;-) Question is, where? I know it's gotta be between the 9:00 and 3:00 positions, but would it behoove me to place it near the exhaust tip, or is anywhere else ok? Anyone face this dilemma? (IMG:style_emoticons/default/blink.gif) Thanks, Joe |
Harpo |
Aug 30 2014, 02:03 PM
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#2
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Senior Member Group: Members Posts: 1,304 Joined: 21-August 11 From: Motor City aka Detroit Member No.: 13,469 Region Association: None |
Racer Chris put my O2 bung on the headers just before the muffler.
David |
Mike Bellis |
Aug 30 2014, 03:07 PM
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#3
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Resident Electrician Group: Members Posts: 8,346 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None |
If it is a heated wide band, it can go near the tip. If it is a non heated narrow band, it need to go closer to the heat source.
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tomrev |
Aug 30 2014, 03:22 PM
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#4
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Member Group: Members Posts: 231 Joined: 25-February 14 From: N. Mich. Member No.: 17,037 Region Association: None |
If it is a heated wide band, it can go near the tip. If it is a non heated narrow band, it need to go closer to the heat source. I think for a meaningful measurement, it needs to be closer to the ports. Ideally in the collector for the bank. The muffler, or muffler tip will have too much oxygen not related to combustion, and give you a very inaccurate #. |
Porschef |
Aug 30 2014, 03:56 PM
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#5
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How you doin' Group: Members Posts: 2,175 Joined: 7-September 10 From: LawnGuyland Member No.: 12,152 Region Association: North East States |
It's a heated wide band. If it has to go in the muffler to allow both banks to provide exhaust, should it go near the outlet, or does it not matter? (IMG:style_emoticons/default/confused24.gif)
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Mike Bellis |
Aug 30 2014, 04:37 PM
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#6
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Resident Electrician Group: Members Posts: 8,346 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None |
Heated wide bands will start to fail if the temp around the sensor stays above 800°F all the time. They sell a copper heat sink for these to dissipate the heat. You could build one yourself with 1/16" copper plate. They mount like a large washer between the sensor and bung. Aluminum will not work as well because unlike copper, it will not draw heat (conduct) as well. An aluminum heat sink would cool down fine but not draw the heat from the sensor.
A non heated needs to go closer to the head in order to heat up. Once hot they read the NB pretty well. Most installation instructions state to mount the sensor close to the head. In a T4, most mount on the header collector for best cylinder (4) reading. On a heated wide band, You can mount it near the tip but as said above, it can read the atmosphere if too close to the end. In this case, as close to the muffler, on the lip elbow would be best. Most dyno tuners use a tailpipe wide band for tuning. It inserts into the tail pipe 6". So I would use that measurement as a minimum from the end of the tip. |
Porschef |
Aug 30 2014, 05:27 PM
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#7
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How you doin' Group: Members Posts: 2,175 Joined: 7-September 10 From: LawnGuyland Member No.: 12,152 Region Association: North East States |
Thanks Mike and all, it is a wide band.
I'll try the end opposite the tip. Now to drop and weld... |
worn |
Aug 30 2014, 07:40 PM
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#8
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can't remember Group: Members Posts: 3,290 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest |
Thanks Mike and all, it is a wide band. I'll try the end opposite the tip. Now to drop and weld... I had the same problem replacing exhausts. Get the two things together and mock up. If it isheated, you can be down the line farther. As indicated above if you are out at the exhaust tip you are reading o2 from the air, but you need to be pretty close to the end if the line if you have gases flowing. Get you angle set and room for the wires and bungholio to your hearts content, and I hope that you do. Good luck. |
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