Need some help with O2 sensors

[Always2Slow]

Okay but whats the proper way to filter the data to only show closed loop operation?

[EagleMark]

SAE.ECT C exclude less than 80c should cover Closed Loop and engine warm.

[Always2Slow]

Now how can i filter or correlate that data to the differnt CL mode values or o2mv values?

[spy2520]

There is a thread somewhere on here that explains it. You have to create a calc pid for it, I believe.

[EagleMark]

I think doing this would really mess up data for tuning where having all .450 in all CL modes is a good idea.

But after you could raise and lower them depending on what you need for idle and what your trying to accomplish is cruise areas of CL Mode. Could work well as a lean cruise for OS without one, could cause to Lean a condition with Lean Cruise... not sure I'd want to tweak this and have lean cruise enable at same time... all theory at this point.

But thinking about this and how GM has changed O2 swing points over the years it may explain how they were trying to get a richer condition with ever changing fuel supplies?

First thing to do is know exactly what closed loop mode your in, this is linked to Scantool, but the 02 switch points are not. If you open your cal_link.txt file on approx line 174 you'll find Closed Loop Mode. Add this underneath to look like this:

 ;Closed Loop Mode
B4107.ROW=SAE.MAF,GM.MAF,GM.DYNAIR

;O2 Switch Points
B4105.ROW=SAE.MAF,GM.MAF,GM.DYNAIR

Save the file and reopen the Tunetool and play back a data log and you can see exactly what CL mode you are in. Change a CL mode from .450 .450 to .350 .350 and datalog to see how Wideband 02 AFR/Lambda reacts?

Remember leaner creates more heat then rich. Even if you look at lean cruise settings in a GM Factry Holden calibration it is not smooth, it will jump around from max lean to richer, leaner and never a steady state. I don't know if this is for cylinder/piston heat or Cat effeciency? Even very early GM lean cruise cals back in 80s and 90s had an on time off time... that said I've have run a TBI truck in lean cruise from 15.7 to 16.2 steady, no off time for 40K miles and no issues... 1990 Chevy Suburban 2wd and average 18.5 mpg highway, best ever was 19.2 mpg. 15 mpg is the worst I can do all in town in winter...

[Always2Slow]

I will find out my mileage on the way back home this weekend what i can get with lean cruise i just know i can do better than 450mv for switch points as they could use slight tweak as it just doesn't make sense that they should all be the same. My ide AFR jumps around right now even with a stoich of 14.17 ita like 14.1 for 1 second and the next 5 are 14.63 or so. My lean cruise so far is higher than 16 for sure but dont know the exact figure as thats what my wideband tops out at. My car basically likes two values when its cruising so i played with those thus far i just leaned them out a slight bit more around 14% lean at the moment should be fine still. I didnt know about the cal.txt file thing seems like that is a great source of information on what each map is composed of or how it is put together.