zapp168

iTrader: (7)

I just got an AEM UEGO A/F gauge. The instructions say to mount the 02 Sensor before the cats but after the turbo. I have an STS and that just isn't going to happen
WHAT TO DO??? WHAT TO DO???? I don't really want to gut my cats

trans2000am

iTrader: (49)

mount it in the same location before the cats,ill be installing mine hopefully soon also. their was a tread about this awhile back not sure if you can search for it or not,but i thought they said the reading are gonna be off a little bit.

Camaro_freak

iTrader: (1)

I mounted mine in the tailpipe, about 8" past the turbo. My closed loop readings are dead on at 14.7:1 A/F, so it seems to be working right. I've heard people say that the exhaust pressure before the turbo can skew the sensor readings. I am running cats also, and they don't seem to affect the readings.

zapp168

iTrader: (7)

Did you have the A/F checked with another tester? to confirm they read the same?

extremez97

iTrader: (6)

i was just about to post the same question. i was thinking either where my y-pipe meets or in my down(tail) pipe. what is everybody doin????

JAvenger007

iTrader: (9)

zapp is this a wideband your installing or just a standard A/F guage? Im confused.

trans2000am

iTrader: (49)

do believe its the 6 in 1 AEM which does both

RooRnZ28

iTrader: (14)

i was told to put it as far back as possible. mine is inserted right before the exhaust goes over the axle.

ZL1Killa

iTrader: (17)

read mine near the end of the tailpipe and had another checking up front... reads fine

zapp168

iTrader: (7)

It is a an AEM 30-4100 UEGO controller. I just got off the phone with AEM they said "The gauge was not designed to work in this situation, it must go as far back as possible, but it MUST be before cats to be accurate."
So damned if you do....damned if you don't. I am going to go just before one of the cats I guess????

zapp168

iTrader: (7)

So the reading was the same in both spots? I would rather put the sensor after the turbo....After all that is where the dyno would check A/F

Camaro_freak

iTrader: (1)

I did not check it with another tester, but since the closed loop readings were 14.7, it agrees with the the narrowband sensors, at least under normal driving conditions. Also, the readings I get during WOT are close to the numbers from my dyno tune.

pdanrichey

iTrader: (4)

Screw the cats...gut or get rid of IMO. I have no cats so I used my rear O2 bung on the passenger side for the wideband.

kbracing96

iTrader: (25)

I put my WB about 8" after the turbo on my STS. I ran and tuned WITH cats for about 8 months without problem. I then went to an ORY and deleted the cats. BEN factors with EFILive where within 1-3% (thats pretty damn close ), since I run in open loop all the time. The difference was probably more from a less restrictive exhaust then from going though the cats.

There is some real world before and after for ya

vipvegas

iTrader: (13)

Did you use O2 sims after getting rid of you one stock O2 to put the guage in

enginjoe

iTrader: (11)

I have no cats and I tried it in the y-pipe. It gave me funny readings except at idle or light cruise, where it was perfect 14.7. I put it on the turbo exhaust and it reads right.

ZL1Killa

iTrader: (17)

it will be fine before or after the cats. as long as you don't have exhaust leaks

Jake@EPP

Put it after the turbo! The added back pressure from the turbo will kill the sensor.

JAvenger007

iTrader: (9)

So it needs to be in the downpipe? How far down and what about the old O2?

Jake@EPP

On the STS 90deg dp. We noticed its about the same as if it was inline.