UEGO bung location for aem afr gauge

[BowerR64]

Originally Posted by 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!

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

[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.

[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.

[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.

[S0C0nFused]

Well, let us know when you start and post some progress info.