does a CAT affect wideband reading at tail pipe?
 

went to dyno and they put the damn wideband sensor in my tail pipe, i got a cat so i would think the cat does something to change the a/f readings!!!

if it DOES change, can someone tell me which way does it skew the results? either more lean or more rich??? i hope it's more lean, thus meaning i'm running a tad richer than actual readings..

Re:does a CAT affect wideband reading at tail pipe?
 

it sensing how much oxygen is in the mixture. no the cat wont affect it, but if you have a tiny exhaust leak itll suck air in and ---- the readings up badly..

the cat removes NOx. thats all. i think.

Re:does a CAT affect wideband reading at tail pipe?
 

no if you read the emission specs, it reduces CO and HC (hydro carbons, aka FUEL) emissions... here in ontario, we have to do this "drive clean" bullshit and you take 3 readings....
i'll post a pics of my readings

Re:does a CAT affect wideband reading at tail pipe?
 

a wideband doesnt measure either.

depending on how much O2 is still present after combusttion this is the reading the computer incorporated to make it better..

ive seen lotsa pics with cars and the WB o2 is on the tailpipe, so i think its fine.