Tom M'Guinn

I have my testpipe out of the car. Before putting it back in for further testing, I thought I would have the wideband O2 sensor bung welded in (for the Zeitronix kit). Is there a collective opinion or where to put it? Is there enough room above the pipe to put it in pointing down (as I believe they are supposed to be)?

Ski

Tom, I (and several others I know) put mine on the test pipe, sort of looking at the right rear tire if you will, down about 6-8 inches from the flange of the down pipe. I installed it almost at a 90° but the bung/sensor might have an ever so slight down angle. This location gives enough room for installation and removal. This is in the general area where the flange of the pan meets the block and then the pan angles out. You can get your hand and a tool in there to work. HTH.

Tom M'Guinn

I opted to tuck it up in the tranny tunnel behind the starter. BUT, I took it to a shop to weld it in, and the shop welded it so that the bung sits out and away from the pipe. The flush mounting surface is 12mm away from the pipe surface. The sensor will still protrude into the pipe by 15-18mm -- is that good enough? I was expecting the bung to be welded with only the flange part sticking up -- kind of like the banjo bolt hole on the intercooler pipe. What do you think?

poormans9fitty1

What do you do if you dont track the car, and need to take the down pipe off and put in a cat for your emissions test?

Eyal 951

I need a recomendation on where exacltry to put the widband o2 censor, and where to put the EGT also. I've heard different areas, and would like a final answer. btw, does the kit come with the flange, or should i be buying one?
~Eyal

Tom M'Guinn

In keeping with their track record, Zeitronix answered my question overnight (on Sunday to boot), and said it will work fine the way it is.

As for location, I studied the threads on rennlist, and poked around other boards. Based on that, there seems to be a consensus that is needs to go (a) after the turbo, (b) before the cat (if you have one), (c) positioned with the sensor tip pointing down by at least 10 degrees. So, I put mine as shown in the picture, on my test pipe, so it tucks up in the pocket behind the starter. Anther option is to put it closer to the turbo, perhaps in the side of the test/cat pipe as it runs under the floor pan -- I opted against that because it seems to leave the sensor and wires a bit exposed (read easily torn off) and more likely to hit the floor pan when things bounce around, espcially if the sensor body is point up by 10 degrees. We'll see how it goes...

Matt H

My EGT probe is in the #4 exhaust pipe about 3/8" inch from the flange. I can snap pics if you like.
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Tom M'Guinn

I'd like to see a picture please. What did you do with the heat shield, and what kind of fitting did you use to mount the EGT, and how did you mount it (screw in or weld?). Thanks

Matt H

Tom, we drilled through the heat shield. It is a Greddy EGT from Japan that was being used on a 935, bought it from a lister in Dallas. We tapped the hole and screwed it in. It looks fantastic and not hacked up like some of the welded ones I have seen. The nicest thing about the probe is that it also screws in, so it can be replaced with ease. I will run down and snap some pics in a second.
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Tom M'Guinn

Tapped the hole you say? I would have thought the headers walls were too thin to tap? Does it screw in kind of like a sheet metal screw? Did you do it with the headers in the car?

Matt H

Here are some, when you drill through the heat shield there is a layer of "something" in there. It is insulation, felt like some sort of ground ceramic mixed with something else.
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Matt H

Tom, the bung is threaded, self tapping IIRC. It is a VERY clean install, IMHO. I wish I could say I did it but the credit goes to HoosierDaddy? (Matt L) as he did the drilling.
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EJ

Anybody Know where you can get a stainless steel bung? Just seems like it will look better and weld up better with my SFR SS exhaust. TIA.
Eric

Matt H

Call Tim, I bet he can get you one as they offer that as an option!
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