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Thread: UEGO bung location for aem afr gauge Reply to Thread
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Topic Review (Newest First)
03-08-2011 10:35 PM
S0C0nFused Well, let us know when you start and post some progress info.
03-08-2011 09:53 PM
BowerR64 Well im not sure about the AEM gauge but the one i have has 2 extra analog outputs. Analog 2 is setup for data logging to the SCT programmer. The analog 1 is setup to trick the ECU into thinking the OEM 02 sensor is still running normaly. The voltage can be adjusted also. Maybe it can even fool the ECU?

Soon as the weather clears up around here im going to try both locations.
03-08-2011 09:20 PM
S0C0nFused OK. I get what emsvitil is saying now.
Ref: http://en.wikipedia.org/wiki/Catalytic_converter

The 1st part of the cat does the NOx reduction
"# Reduction of nitrogen oxides to nitrogen and oxygen: 2NOx → xO2 + N2"

So does this mean that even if your running at perfect stoich ratio (14.7) that the wideband is going to read lean do to the oxygen created by the 1st part of the cat?
I would think yes.
03-08-2011 07:00 PM
S0C0nFused Lambda (or stoichiometric ratio) is 14.7. So I wrote it wrong. sorry. So if you reading 14.0, then that indicates rich I think. Search for 'stoich' on this forum as I know there are scads of discussions on it.
go here to read a bit about A/F ratio.
http://en.wikipedia.org/wiki/Air-fuel_ratio

I can follow emsvitil, but not sure about SprungSonde as he writes as if english in not his/her 1st language. I cannot decipher his acronyms.
03-08-2011 03:55 PM
BowerR64
Quote:
Originally Posted by S0C0nFused View Post
VERY interesting. A 3-way cat. Never woulda thunk it. I have no clue as to what kind we have though and the effect on the wideband. But, I would think this would be valid >> The ECU maintains a 14.1 lambda when closed (input from MAF and 1st o2 sensor). OK. So if you are running good fuel, and you don't have a lot of miles on the car (I.E. the cat is in good shape. I have no idea how to statistically age a cat though). Then IF, your A/F gauge is reported 14.1 A/F ratio, then I would conclude the effects of the very 1st cat (within the mani-cat) has negligible effect. That would be MOST interesting to know.
Good info there from innovate. Nie job!
lol, nice job? i have no idea what any of it means though. Do you understand it?

When i hooked my wideband to the rear of the tail pipe on my car yesturday and ran it around the block i got an average of 14. i thought that was to lean? I thought it was supose to be around 12-13
03-08-2011 02:01 PM
S0C0nFused VERY interesting. A 3-way cat. Never woulda thunk it. I have no clue as to what kind we have though and the effect on the wideband. But, I would think this would be valid >> The ECU maintains a 14.1 lambda when closed (input from MAF and 1st o2 sensor). OK. So if you are running good fuel, and you don't have a lot of miles on the car (I.E. the cat is in good shape. I have no idea how to statistically age a cat though). Then IF, your A/F gauge is reported 14.1 A/F ratio, then I would conclude the effects of the very 1st cat (within the mani-cat) has negligible effect. That would be MOST interesting to know.
Good info there from innovate. Nie job!
03-08-2011 12:19 AM
BowerR64 Here is a post i got from the innovate site, tell me what you think.

Quote:
Originally Posted by emsvitil View Post
It's a 3way Cat. 3way cats are comprised of 2 half converters.

First half is a reduction cat for NOx.
Second half is a oxidation cat for HC and CO.
The first half helps supply O2 for the 2nd half.

First bung is before the cat does anything.
2nd bung is after the reduction phase.
3rd bung is after the oxidation phase.

So with the 3 locations you can figure out how each half of the cat is working.


If the middle isn't for a O2 sensor, it could be used for a temp sensor to avoid overheating the converter.
Then another user,

Quote:
Originally Posted by SprungSonde View Post
All KAT's, especially the one using NBOs, are Three-Way-KAts because the process three not allowed emissions that's why the was called Three-Way-KAT.
Rest-Fuel and CO, combusted, NOx reduced, that happens in parallel.
For the Warm-Up-Phase after an Cold-Start some Car's use Start CAT's having an slightly other composition because the Emissions are rich at Warm-Up condition.


Interesting is this for sure?

#1 an NBO2 can Control best efficiency of the KAT.
#2 can be an WBO2 to Tune for rich and lean.
#3 an NBO2 is the Monitor Sensor for OBD.

That's how I think it work.
Different Countries have different Emission restrictions, so it seems possible that Ford use different Sensors in the three Bungs.
Quote:
Originally Posted by SprungSonde View Post
All EFI's using NBO2's do all the AFR controlling only to make the KAT happy.
03-07-2011 03:41 PM
PSUrivie Nope just swapped it out.
03-07-2011 02:53 PM
BowerR64 Cool, thanks. Im not planning to get a tune for a few more weeks. Im going to just drive it with the CEL for a while with thewideband in that location.

Did you put a heatsink or anything on your sensor in the second location?
03-07-2011 02:26 PM
PSUrivie I have the AEM it works really well. As for some of the earlier posts, you need the 1st o2 in that location. The ECU uses the inputs from that sensor. The 2nd sensor is just using a cat monitor which is just telling the ECU ithat the cat is doing it's job. So swapping if for your wideband isn't going to effect engine performance.

The wideband will be on of your best tools while tuning.
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