Hey guys. I'm working through installing an XS turbo kit on my Celica (with a Power FC) and it seems like the RX-7 crowd has by far the most experience with these ECU's. I have been reading on this forum and AEM's forum about their UEGO wideband sensor/controller gauge and there are a few questions I have left.

It seems like anyone running the AEM UEGO (or even the Techedge for that matter) was unable to log the signal with the Datalogit. The signal was all over the place. What I'm wondering is, is the Datalogit just logging the signal wrong, or is there alot of noise in the signal reaching the PFC? Has anyone tried removing the Datalogit and seeing if the problem clears up? Also, the threads I was reading were somewhat old. Does anyone have new info? If the AEM UEGO causes a problem, is it possible to run it in parallel with the stock O2 sensor and log the data separately and overlay it on the Datalogit data? From what I read, it looks like you are able to log directly from the AEM gauge.

 

Here's some more info I found from an SR20 site and a guy using a Techedge wideband and a PFC

you do not need to connect the 0V connection on the datalogit. But instead, i would recommend connecting 0V from the techedge to AN2 of the FC-Box, then selecting "Delta AN1-AN2" on the Setup->Auxilary window. This will help eliminate any "ground loop" errors.
I would also check what raw AN1 voltage you are logging. 14ish AFR should be around 2.5V whereas 9.08AFR you are seeing sounds like ~0V.
Steve

It sounds like they're bypassing the ground from the Datalogit to the PFC. Delta would indicate that the PFC is looking at the difference in the ground voltage (AN2) and the sensor voltage (AN1). The AN1 voltage would come from the Datalogit since it is logging the sensor voltage. Anyone try this or have any success with it?

 

Yeah, I've tried it both ways and all I end up with is a seismograph looking reading. I think one or two people have gotten lucky and gotten the AEM to work with the PFC and datalogit, but there's plenty of us who have not had any luck. The best info I've found is that there's apparently some type of analog to digital conversion problem between what the AEM UEGO sends out and what the datalogit reads. Grounds and voltage sources made no difference for me. I've waited a year for a resolution to the problem, but I think at this point I'm going to hock my AEM for whatever I can get out of it and just get a techedge.

 

sorry to bring back an old post but has anyone had any luck with the Uego and datalogit? i just got a datalogit a couple days ago and wanted to see if i can get my uego to work with it. thx!