It seems that people are mixing up the serial logging with the analog logging. If you are sending the signal to the ecu you have to use the white wire, not the blue wire. Also make sure the output rotary switch is set to give you the correct output.

 

I know this isn't an exact answer to your problem guys, but you could always try running a separate cable just from your wideband to your laptop. This is what I did. I know it adds a second cable into the loop, but it has worked 100% for me from day 1, and allows more throughput from my ECU for other items I'm logging. Even if you don't have a serial connector on your laptop, you can just buy an adapter. I have a USB to Serial connector and it works great!

Hope this helps some of you... Like I said, it may not be favorable for you as you may not want a second cable in the equation, or want to buy an adaptor (for those of you that don't have a DB-9 port), but it has worked perfect 100% of the time, from minute 1 for me. Just my $0.02!

 

When i say the "blue"wire, i'm talking specifically about the vehicle's harness (ECU side or sensor side). I'm only utilizing the white wire from the UEGO. I understand the blue wire is for serial logging......which is actually looking quite good right about now LOL

I'm actually getting to the point of putting this "logging through secondary O2" on hold and just wiring up the serial gauge so I can get to tuning. I can't take much more of this wastegate boost and base map idle!

 

Did you do the add Rear WB02 patch?

 

Yessir. Haha I got so fed up with it I just bought the Spec Ops Serial Cable.

 

And we appreciate it sir!

 

I priced out the materials with wire, tape, and gas to the hardware store/Radio Shack included, and just buying your cable was honestly less .

Thanks, mang!

 

No problem! I actually make them per order, and yes unless you have everything laying around it is just cheaper to buy the cable...

 

Yeah, I noticed that . I actually picked it up from STM as I had to order one of their fittings as well, and I believe they had it in stock, too, if I'm not mistaken!

 

STM buys in bulk so they have them in stock

 

A little update on my frustration:


A little digging around turned up a O2 simulator had been wired in further up the harness LOL. I'll be removing it later today and re-testing.

 

So this lovely AEM WB02 doesn't log below 10:1 AFR for pump gas?

 

Having same issue with gauge/evoscan being off

 

Was wondering if someone could tell me what i need to add to evoscan to log the actual input voltage from the uego. I can get the logged afr to match my gauge at stoich and be off at say WOT or the opposite. Right now, i know im seeing mid 11's during wot out the top and logs reflect that, but just idling evoscan is off like 1 afr. Id like to log the voltage going into the ecu and compare it with what evoscan is seeing and the actual gauge itself.

 

Its all in the formula. I recently just got back to tuning as weather is now permitting. I rebuilt PC in mean time as well. The point is i had to start from scratch in determining the correct formula, like you i got initial formula from forums. I could get lean side to match up but rich side was like .4 points off. the output of digital should be a value of 0-255. My initial formula was:
(18-8.5)/255*x-8.5
Like i said stioch and lean side were good but it was off on rich side
so to figure out WTF i pulled WB sensor and let read atmosphere and it only read leanest value of 248,
Then i dampened a rag with a little gas and richest value was 24. So this altered my initial formula quit a bit:
(18-8.5)/224*x+7.5

now leanest value reads 18 in ECU and richest reads 8.5, hope this helps.

EDIT*****
scratch the above my formula was still off in 14-16 AFR range. Further reading gave me new hope.
i read this post and followed it. my readings in evoscan match my gauge damn near perfectly.
https://www.evolutionm.net/forums/9933717-post119.html