LTFT Issue

[DCZ]

Car is 15 Z06 A8

I am chasing what was believed to be vacuum leak. After using smoke machine, vacuum leak ruled out. Currently when cruising trims will exceed 20% add. I also noticed car when at an idle, stft/ltft will continue to show adding fuel and then both ltft/stft drop to 0, pause for a few seconds and then STFT starts adding fuel again as expected and ltft start to respond..

I am trying to understand what would make the LTFT dive to 0 when they have been in 20% add range. Maybe somebody has had this issue in past.

Again, no vacuum leak, even replaced MAF. I did go upto Soler 95mm TB/eff 100mm. Makes me think issues could be with modified TB. From what I can see in past logs, trims started acting up after adding 5" intake and Soler TB

TIA

[village_idiot]

Have you recalibrated the MAF since changing the intake tube/TB diameters?

If not, start there. Part throttle/cruise/idle can be done using fuel trims. To properly calibrate WOT, you will need a wide band

[DCZ]

Problem fixed. Had to add add more fuel than expected..