Can you run without downstream O2 sensor?

[Kodename47]

Here's mine for reference. You can see where CL starts at the brief blip of off throttle. AFR in red, commanded in yellow:

[tomm.brz]

Originally Posted by Kodename47

Here's mine for reference. You can see where CL starts at the brief blip of off throttle. AFR in red, commanded in yellow:

Did you ever fix this temporary 13.8-13.9 afr target during closed loop?
i get it too (somehow shorter duration than your log but kinda similar) even with rear o2 fitted but CL#3 / AF #3 disabled(zeroed) in tune regardless if it s a prerestyling or not (all euro cars)

i also think ecutek doesn t have ALL af#3 correction/learning tables defined so i think at least one table for it i cannot zero

[Kodename47]

Originally Posted by tomm.brz

Did you ever fix this temporary 13.8-13.9 afr target during closed loop?
i get it too (somehow shorter duration than your log but kinda similar) even with rear o2 fitted but CL#3 / AF #3 disabled(zeroed) in tune regardless if it s a prerestyling or not (all euro cars)

i also think ecutek doesn t have ALL af#3 correction/learning tables defined so i think at least one table for it i cannot zero

I zero'd all of them in Romraider before building the rest of the tune in EcuTek and it made no difference. I only fixed this by making a custom map to run closed loop fuelling so the OEM closed loop is only operational at around idle. I do suspect that it is to do with the rear O2 sensor, but I had assumed that if the rear O2 was fitted and working then this would disappear - I just don't have anywhere to put the sensor in the manifold.

[tomm.brz]

thanks

unluckily it does the same with rear 02 fitted (but disabled), and if enabled it does that strange swing rich-lean around 14.7 on cruising and often apply a little AF#3 correction to the open loop and it is annoying all of these

i could try your way too, maybe directly with CL of racerom10, but i did try something like that month ago and couldnt get it working smoothly... did you zero the af#1 correction tables (stft) ? or just modify other tables to disable stft at a certain load, lower than 0.7-0.8 of stock logic?
and how ? :\

[Kodename47]

@tomm.brz I just set the Minimum OL AFR value to around 14.7 and the fuel map to a touch below so it goes OL in cruise and then use a custom map to do CL cruise fuelling. It even allows leaner burning, which is why I did it.

[tomm.brz]

God, seems even better than my running leaner because i offset the front lambda scaling :P
and i use happily and bugless racerom 10 CL fuel control so i can save me the custom map for the CL fueling
I ll try, thanks kodename