o2 inicial value

[ony]

I was wondering about the o2 setting[inicial value] in my bin file its set to 0.451, but the rich mean lean is set 516,486,455 at 0 air flow and increases up from there. do I need to increase the inicial value in tuner pro? getting close to 1000 burns on my gq-4x

[EagleMark]

Your the only guy I've ever heard of that wore legs out on a chip!

The O2 Initial value is the center of O2 voltage, the point at which the O2 switch/cross counts. So desired AFR of fuel set to 14.1 is where initial is. So there is Initial, Rich and Lean. There's no reasoning in why some GM have it set to not switch in some calibrations? Maybe an emissions or CAT thing? If they are set to no switch like Initial 451, lean 399 and rich 408? never hits 451? It does anyway because of "O2 - Window for Fast O2 R/L", then INT continues to rise until it hits value of "O2 - Counts Err Thres for INT Correction" changes BLM and switches anyway. I like them to be set to switch and avoid this. Example low under 451 and high over 451.

To keep it closer to Initial value you can reduce "O2 - Window for Fast O2 R/L"

To understand more how O2 sensor values and fueling work read this. Oh yeah take an asprin ahead of time...
http://www.gearhead-efi.com/Fuel-Inj...obert-Rauscher

With a Wide Band O2 sensor you can make some slight AFR changes with O2 settings and see the difference.

[ony]

that's a pretty good article, I will have to go back an read it again I forgot what [propation term I think 0x2f7 ] is what I need to find. that 5.9.1 xdf works good I have run into one slider that works backwards [closed loop-warm timer cts threshold]. my o2 sensor went up to 0.993 then stayed a 0.284 for a while ,it may be going bad or my bin might have got corrupted, starting over with a new bin.

[EagleMark]

It took me many times reading and tuning to figure it out. Not sure I still have it all right but sure can make a tune work!

The slider that is backwards is correct! Look at stock setting and go from there. It was a lot of work from many involved here to get it to work correctly and has never been done before. If you adjusted it wrong it sounds like you went Open Loop!

Proportional Gains is amount of fueling adjustment made do to O2 sensor feedback.
"PRP - Gain vs. O2 Error"
"PRP - Gain vs. Air Flow"
Then duration for both.

[ony]

sure a lot of differents in these bins when you open them with tunerpro and compare them, the apab bin they set the rich,m,lean up around 0.550. its a 6cyl. sync, bin

[EagleMark]

Yeah I know, I've been comparing them from 1987 through 2000s and there does not seem to be any real logic as to how they are done. I guess if it passes emissions GM is done!