Need help with crazy AFR issue with dead spot

[VTXU8]

Yeah, That's what I have been doing Antus. Adjusting my injector multiplier table based on Wideband Correction afr histogram. It does work but seen as My ecu is always commanding afr of 14.6 and not changing with my afr settings in open loop, all the corrections and adjustments to my inj multiplier table will only achieve afr's of 14.6 throughout the whole table which is no good in the high end of the fuel table and PE.

I used the spreadsheet too which is great at getting in close but it will only give results/changes to achieve afr of 14.7 I have read and been told to turn off closed loop by setting the BLM temps to max. This has stopped LTFT's but STFT still works as it's meant too.
I just don't know why the ecu is always commanding 14.6 no matter how hard i drive it until i hit PE.

[VTXU8]

This is the only settings for Closed Loop. And from what I understand, is what you change to turn off Closed Loop.

closed loop.jpg (35.7 KiB) Viewed 2547 times

[VTXU8]

I thought i'd add some closure to this thread so it may become useful to others rather than being a dead end.
Have finally had some time to go after the issues I was having. Turns out it was the MAF causing the dead spot or more to the point, fuel cut. Maf was maxing out a little under 9500hz. As soon as the air hit 186g/s The maf would fall off cutting the injector times with it causing a huge lean spike. The maf is a Delphi 25168491 which is meant to easily handle up to 12,000hz+. I ended borrowing a second hand Maf the exact same Delphi model and it reached well over 11,000hz with no issues and no more fuel cut. Before, I could only reach a maximum of 50% throttle on the old Maf. I am now able to hit 100% throttle and Cyl/Air hits over 950, now I can move on with tuning knowing that was the main problem.

So I can only assume that the first maf was defective or a fake. Both are identical. Only difference is the first maf has no serial number sticker like the working second hand one does. Soon I will be installing a card maf from a HSV LSA GTS( LS7 maf) into my already existing 4" intake. Going to be fun getting maf and fuel tables dialed in right but whatever. I've come this far, why stop now.

Pics below shows where the maf peaks and rips the fuel. Thanks to all who chimed in to help.

Hz and TPS on the bottom. Grams/sec, Inj time and rpms on top.

[antus]

Cool, thanks for posting what you found!