I installed the AEM uego gauge the other day and have been noticing the readings are off when compared with my AccessPort at times. For the most part they are pretty close(crusing) but when I stomp the gas there's a pretty big gap in the readings. The reading are not alway off it just seems the AEM will jump faster than the AP so is this normal? I know there's adj for type of fueling on the back of the uego but I didn't mess with it. I'm running ethanol free gas and it seems as if there is a setting for ethanol and e-free anyone know what setting it is(p1,p2,p3)??? I just want to know which is more accurate if it's the AP then the AEM was a waist of money.

the uego is placed where my rear o2 was. I'm cat free(turboXS) and it useless so I just yanked out the old and added the WBO2.

I have posted a link of a short 4th gear 1/2 throttle pull for an example of what i'm talking about. The readings are close enough where you'll need to pause the video several times to see the jumps. I'm assuming the uego is just faster dunno.

http://www.youtube.com/watch?v=Sdtkv6srdGE

 

^I belive mysql was getting that with FI remember seeing a video of it(I think if was him) I say as long as ur not getting like 10:1 on one and 15:1 on the other u are ok a very small diff is fine

 

There's no doubt going to be a slight variation as well as a little bit of a delay with the AEM. I agree that as long as your not seeing more than .5 of an AFR difference on a constant basis there shouldn't be an issue.

Overall though, I've noticed a slight delay between the 1st and 2nd o2 sensor reporting.

 

edit: i agree with flashwong's statement, just trying to make sure you understand that a "small" difference is relative

small difference could also be bad. like say 12.5 in boost or 13-13.5 in boost....

it sounds like what your seeing is the latency on the sensors/data. the AEM likely reacts much quicker thats all

 

these shots are under 1/2 throttle conditions and in my opinion should be very close at all times. I can deal with .2 - .3 but these still pics might better show my reason for concern.

 

the biggest differences are when you are changing load on the motor right? when your cruising or idling steady they stay pretty close right? the AP just takes longer to report the changes. the AEM just updates it display much faster than the AP can pull the same info from the CAN

 

i'm such a worry wort. Just can't help myself.

 

no fault there, im sure i'll be the same come june..

 

see video:

http://www.youtube.com/watch?v=fCmbf...e=channel_page

 

i haven't installed mine yet..but i do have a question regarding replacing the o2 sensor..all u did was replace the o2 with the uego and not weld the bung that came with it?

 

you cannot remove the oem o2 sensor. your car needs it.

 

you cant remove the first one. like ^^ said. you CAN remove the second one, the second one(in the cat) is ONLY used for checking to se if the cat in working properly... removing it will give you a CEL unless you mask it with the AP

 

i see,so i CAN replace the one in the cat,without doing any mods,and just mask it with ap (which i have)..sweet fine with me then,and it will read it just about right? and sorry for stealing ur thread..thought i might ask since u have the same gauge

 

Sensor position, type and latency all play a part in that.
You should increase the "damping" if the AEM has that function.

You should also perform a free-air calibration of the AEM if it supports it.

Your OE WBO2S might also be on its way to the grave, though that doesn't happen too often.

 

the aem uego does have a calibration ... the manual described it. I don't recall offhand.

 

thanks

 

you are getting an over 15 reading at 1/2 throttle (not steady state cruising i am assuming?) ---uhhhhh that ain't good?
i am running the innovate set up and i find it to be very close to the oem readings.
hmmmm my "high" readings go to 22.1--light load cruise(no hills--no a/c--no accellerating) is the only time i see a 15-- and thats just the occassional hiccup we all have. NEVER at 1/2 throttle.
I also have found that the best power source is from the secondary oem sensor(post cat) it's dedicated and is not totally dependant on the ignition switch---as we all know you do not want a switched power source for the wideband.
OD

 

For the most part they are pretty close but if you look in pic 1 and 2 the rpm's change by 150. The AP stays at 11.8 but the AEM goes from 13.4 to 10.1. Now if the aem is that much faster then damn but I would thnk the AP would atleast change a bit. I'm sure this is all just over reaction but wow what a difference.

I'll be in atl for the mazmart meet if anyone what to take a look but again i'll bet it's fine.

Never mind I got to looking real good and apparenly i'm slowing down/off throttle so the pics are out of order. Still that doesn't change the fact the AP didn't change over 150 or so rpm's.

 

yeah I have watched mysql's videos too much that i knew it was him with the diff readings!

 

hey i will see you at the mazmart thing ---great !!
you are probably just fine.
OD

 

The AP has a lot of lag to it. I don't know if they fixed that in the last six monrhs with the new software.