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STFT and LTFT observation.

91 views 3 replies 2 participants last post by  Desert Rodent  
#1 ·
The time I've spent, over the years, with tuning issues, I've always depended on the use of a wideband O2 and made adjustments/changes accordingly. Now, since obtaining this Nissan pile, it seems as if I have to learn new tricks.

I'm including a photo of some data acquired from my Foxwell NT710 scanner which does "live" dataloging. I'm interested to hear from some of you with experience in this area as to how you evaluate the data presented. The photo demonstrates the data streams which I like to monitor for engine efficiency and the overall wellness of the engine. The data was acquired while driving at 60 mph on the cruise control where these streams were fairly stable for a few seconds. Changes in LOAD creates a lot of movement in various sensors and has become a staple in my diagnosing. The A/F sensor responds very much like a wideband and MAY be just such without the expanded capabilities of a typical WB. This sensor responds as I am familiar with regards to LAMBDA.

Of particular interest is the STFT and LTFT as I'm NOT used to working with these streams. With those indicated, what is the general opinion of the members?

Some of you may recall, I have been dealing with a 420 issue which seems to have calmed down since the install of a shield. I KNOW that there are other conditions which can make this code show it's ugly face and while I can drive it now, I'm gathering other data do analyze as possible causes.

There is several members here that are very well versed in all things Nissan. I would be grateful for any and all feedback.

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#2 ·
I LIED!! The photo in the preceeding post is NOT the photo of the conditions I described! I seem to have lost that one. The photo actually represents an accelorating condition. I'll post the other photo shortly to go along with the first post. Sorry for the confussion. It seems my internet provider is working on the system as several hickups have happened while making my posts. Later....