LTFT and STFT have no affect at WOT. So if that case was to happen, you'd have problems whether you ran open loop or not.

Ran mine open loop for a few months when 1st going SD. And got a friend running no o2 sensors at all.

You can either just tune the fuel map to make your WB read your desired afr; or go the long way and set the fuel map to the desired afr, and adjust the maf comp table (and VE if its SD) to bring WB readings to desired afr. I did the latter, but in the end its pretty much the same.

 

Is there a tunable map for closed loop O2? I would love to be able to change the target AFR, especially on cars with huge injectors when cruising at stock AFR's is not as smooth as it should be.

 

Not possible unless you wire your wideband directly into the ECU (there's a thread about this somewhere in here) or use a simulated narrowband output from a wideband that has it (Like the Zeitronix). I used the simulated NB output on my ZT2 this summer and it does work however the ECU does take more time to adjust fuel since it's farther downstream, so variations in AFR are bigger than when using the stock o2 sensor signal.

 

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^YES. Ive read that disabling the closed loop periphery messes up other things. Just 0 out the load tables.

 

^ or both, load and tps ?

is only one of them enough ?

 

Zero out all 4 maps.

 

only both load or both tps is required, but by all means go ahead and 0 out all 4 if you want

 

Doesn't the ECU check that both the load AND tps thresholds are met before switching to open loop? Or does it switch as soon as one of them reaches the threshold?

 

It switches as soon as either condition is Met.. either load or TPS.. whichever occurs first.

 

Ive done mine with only load as well as my buds.

 

I think this might be misleading. Even if you wire a WB, it would still be used for logging purposes only. AFAIK the ECU only uses a Narrow Band for realtime error correction (STFT) and long term corrections (LTFT) of the fuel injectors.

As far as tuning an NB tuning goes....there would be nothing to to tune since its Rich, Stoichiometric (14.7) or Lean

 

https://www.evolutionm.net/forums/ec...o2-system.html

 

That's unfortunate... Other cars (like Honda ECU chipping), the software I use already allows me to change AFR target that's still within useful range on the factory narrowband.

I wouldn't want it to sample AFR down in the 13.0's, but would be nice if there was a 3D tunable map based on load/RPM and I could change the target to say 14.2:1 rather than 14.7 from the factory.

 

so, switched to open loop.
car idles and cruises at 11-13 afrs. injectors are scaled to known good values. so should I play with my maf scalings ?