Tuned with a properly calibrated NGK wideband w ntk sensor. Mods on GTO are headers and intake for the most part. I very carefully modified the ve table. I very carefully modified MAF while in open loop also. I am new but read up and took my time over a couple of months. Everything looked fantastic.....then I put back into closed loop....and then my
actual AFR tanked in part throttle on the wideband down to 14.2-14.3. It doesnt matter what I do (maf hz) since it appears my 02 sensors are running the show now. The wot afr still looks very good however 12.6 for the most part and then down to 12.4. I guess I am a little dissapointed that I spent so much time just to have my 02 sensor drive my afr down and ltft are not slightly negative.
I have gone over the tune for too long. I have learned alot(not enough apparantly) but I was hoping for a better outcome. Since I believe slightly negative ltft are the objective, I believe you might be better off tuning part throttle closed loop by LTFT vs versus wideband. You might as well pull the wideband and hang it on the wall while tuning part throttle if slightly negative
LTF trims are your goal.