I never use closed loop in 2-bar or 3-bar installations unless it has a full time wideband closed loop controller like Holley or Megasquirt or Haltech. The OEM ECU does not offer wideband closed loop so it is obsolete. If you are a beginner it would be important for you to learn how the closed loop function works, as part of natural process, similar to the way we learn pre-calc before calculus and then never use pre-cal again. It is merely historical.
So for example in my 2-bar file, which is tuned in open loop 100% of the time,
https://forum.hptuners.com/showthrea...l=1#post686802
You can see I target wideband a/f ratios, not closed loop or narrowband ratios. This improves fuel economy, keeps plugs cleaner, reduce carbon deposits. All modern Stand-alone ECU have this feature in closed loop but OEM ECU does not so we use OPEN loop to achieve the same affect.
Once you threshold the normal Power Enrichment mode, for example mine is set around 80KPA and maybe 28% throttle, It starts using the power enrichment tables to add EQ ratio on top of the VE tuned valves.
For example if VE table is tuned to 14.5:1 and PE Mode calls for 13.3:1 it will wind up somewhere around 13.1:1 air fuel ratio actual.
This is because the PE Mode assumes the VE table is tuned to stoich 14.7:1 so if you are off by .2a/f ratio then PE will probably be off around the same magnitude, although a/f isn't linear its easy to think about it that way.
Once you meet boost threshold requirements it will jump from PE mode to BE mode, and use BE enrichment values given some boost pressure.
So it will jump from using RPM in PE mode, to using BOOST in BE mode as the target is based on RPM is the PE but based on Boost in the BE mode.
All three tables, VE, PE, BE, work together for smooth transitions into power and boost enrichment during open loop in my file. It never used closed loop, ever, not for 5 years 50,000 miles, I don't even have narrowband oxygen sensor, it is obsolete. The wideband has a narrowband inside it. Some have configurable analog outputs but that is getting beyond the scope of this discussion.
There is also a fourth table to be aware of, its called like "EQ global" or "EQ ratio" or something. I forgot the name. But it will directly influence the VE weights, for example during cold start when coolant is cold, this table uses values like 1.25 instead of 1.00 to give a 25% Increase weight to the VE values which gives us the cold enrichment. This table seems to work both ways as I've used 0.95 values to remove fuel for cruise situations for example.