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I have my car on the lift, planning on a loc for the wideband bung. I'm hitting a wall. Before I start, I DO NOT want to change exhaust configuration to full headers right now. Too much going on.
So, I'm looking for any ideas to get an AFR reading given what I am working with. I was along the lines of a Dashlogic then fed by a WB into the 0-5v PID. Regardless, even with a gauge I still need to get into the exhaust ahead of the cat. That is the problem.
So, here's my setup. I have Magnalfow short tube headers on right now. They bolt up to the stock cats. Again, I need to leave all this in place right now...maybe an add LTHs WAY down the list past the FI install and tune.
I cannot find a place to locate the bung. There is clearance where the wideband could live, but it's the bung location itself. Here are three pics that might make it clearer: Magnaflow pipes; stock C6 Cat; a pic of my setup, albeit no way to get a good photo. The header in the foreground is the driver's side.
My dilemma, there is no pipe before the header flange and to the collector; likewise, there is no pipe past the flange and before the Cat. Pass side looks the same. By the way - If I were able to get the bung mounted along the same ring as the O2 sensor on the header, will I be too close to the heat from exhaust ports?
So....any ideas?
Any creative workarounds?
How bad would it be to go after the cat? I'm sure I can guess my own answer, but is there a "correction" factor I could use?
Welded into the stock cat.. Its been a while, but I believe the cat is double walled in this spot. May not be 100% best position, but it did work for me.
OK that's the answer. I look at at it and wondered if I could get the bung there. I will do that, problem solved. Recmech you obviously drilled through both walls, but I like this pos too BC it looks to be a better distance from the heads, where I read the extra heat wouldn't be good longterm for the sensor. THANKS guys!
Schpenxel - Thanks for the offer. I'd do it but for the ship. I can easily do this . The lift is in my garage so, 20 mins to get the cat out. Just need to get the bung...and the wideband and dashlogic. Glad to back on track again!
OK that's the answer. I look at at it and wondered if I could get the bung there. I will do that, problem solved. Recmech you obviously drilled through both walls, but I like this pos too BC it looks to be a better distance from the heads, where I read the extra heat wouldn't be good longterm for the sensor. THANKS guys!
Schpenxel - Thanks for the offer. I'd do it but for the ship. I can easily do this . The lift is in my garage so, 20 mins to get the cat out. Just need to get the bung...and the wideband and dashlogic. Glad to back on track again!
When I added a WB bung to my LS3 exhaust, I did it at the same spot. However, I used a 45 degree bung which made for a preferred angle on the sensor.
Last edited by Mike's LS3; 09-11-2016 at 11:59 AM.
I am guessing that he is referring to the fact that the sensor end should be tilted somewhat downward when installed to eliminate moisture from settling in it.
I am guessing that he is referring to the fact that the sensor end should be tilted somewhat downward when installed to eliminate moisture from settling in it.
Makes sense. I am going with the place the guys showed above. Into the case of the Cat. The actual placement when assembled would put the sensor at about a 9 o'clock position as the entry point of the assembly is on an angle but almost vertical.
I am guessing that he is referring to the fact that the sensor end should be tilted somewhat downward when installed to eliminate moisture from settling in it.
That is correct! Moisture will damage the sensor.
As per PLX instructions "The sensor should be mounted in the top side of the exhaust pipe at a 15* angle away from the flow of the exhaust." Look up PLXdevices.com and the user guide for an illustration.
Not sure what your wideband manufacturer recommends?
The 45* bung might help orient the sensor closer to 15* angle vs using a flat bung. I bought both bungs and the 45* angled bung worked best for me.
Last edited by Mike's LS3; 09-13-2016 at 11:23 PM.
Should be good to go! I would just make sure you have clearance to remove the sensor with the cat installed.
Good suggestion. I am working it backwards. I am waiting to receive the bung. The cat is still in place. When I get the bung I will screw in an old sensor then place it where there is clearance, outline it with a sharpie, then remove the cat and fabricate.
Good suggestion. I am working it backwards. I am waiting to receive the bung. The cat is still in place. When I get the bung I will screw in an old sensor then place it where there is clearance, outline it with a sharpie, then remove the cat and fabricate.
I have my car on the lift, planning on a loc for the wideband bung. I'm hitting a wall. Before I start, I DO NOT want to change exhaust configuration to full headers right now. Too much going on.
So, I'm looking for any ideas to get an AFR reading given what I am working with. I was along the lines of a Dashlogic then fed by a WB into the 0-5v PID. Regardless, even with a gauge I still need to get into the exhaust ahead of the cat. That is the problem.
So, here's my setup. I have Magnalfow short tube headers on right now. They bolt up to the stock cats. Again, I need to leave all this in place right now...maybe an add LTHs WAY down the list past the FI install and tune.
I cannot find a place to locate the bung. There is clearance where the wideband could live, but it's the bung location itself. Here are three pics that might make it clearer: Magnaflow pipes; stock C6 Cat; a pic of my setup, albeit no way to get a good photo. The header in the foreground is the driver's side.
My dilemma, there is no pipe before the header flange and to the collector; likewise, there is no pipe past the flange and before the Cat. Pass side looks the same. By the way - If I were able to get the bung mounted along the same ring as the O2 sensor on the header, will I be too close to the heat from exhaust ports?
So....any ideas?
Any creative workarounds?
How bad would it be to go after the cat? I'm sure I can guess my own answer, but is there a "correction" factor I could use?
I had this dilemma. Tuned the car using PLX with narrow-band simulation in the pre cat bung. Decided that for reliability I don't want to use the sim. There was no place to put a bung. Did some research and finally decided to use the after cat location.
Yes I know "if will screw up the reading"... Actually no it don't, maybe 0.1 and the cats do nothing at WOT. Go ahead and use that bung.
09-10-2016, 05:25 PM
Wideband Bung Challenge
