Plx M-300 Wideband Tuning Help Please

[mad_trbo]

How many of you out there are using this unit?

I am curious about how to read the PLX's analog line as well as the PLX display. PLX's web pages states that .5v from there unit is stoich, specifically this link ; http://www.plxdevices.com/M-Series-...OutputGraph.jpg

I have the PLX's analog signal hard wired into the ECU taking place of the stock ECU. According to the link previously mentioned Stoich is @ .5v. When using the pocket logger am I seeing a voltage reading, meaning when I see .88 I am seeing .88v?

I ask because I am seeing around 10.5:1 on the PLX display and .88 on the pocketlogger as an 02 reading. This is all taking place in a 3rd gear pull between 4,500 rpm and 6,500 rpm. The pocket logger leads me to believe I am borderline while the PLX looks rich and to boot I am getting knock around 23 counts. I think it is rich knock, but before I can truly determine this I need to decipher what the PLX analog line is sending the ECU.

Anyone got any ideas.

 

[kilurv8]

I have been researching the heck out of widebands over the last few days and I just bought this unit. From what I gather, it sounds like you are trying to log the narrowband output. If you do that, you are going to get the same readings and behavior from your front o2 sensor. I am not sure if your palm is capable of logging the 0-5v signal that is meant for the wideband output. I am going to be hooking mine up to my dsmlink and using the MDP input. Someone wrote a routine that changes the raw voltage inputs into that sensor and calculates the a/f mixture. If you are trying to monitor the narrowband output as wideband, it wont work.

 

[mad_trbo]

Thanks for that response. I am using the narrow band to feed the ECU on a 1g GSX. This is supposed to be in the same 1 volt format of the old O2 sensor.