Hello i managed to get rid of the 17705 code.

I did some data logging, and I must admit things absolutely not working the way I expected it tbh.

Car is overboosting and runs into lean condition regardless that I adjusted fuelling to do a richer mixture. Somehow actual does not follow requested no idea why.
Did not touched boost map yet so the overboost condition perhaps N75 related which is shame as its a Febi and less than 1 years old. N75 Resistance test seems ok 29-30ohm when hot and its clicking when i do VCDS output test, but it could be still bad i know, so I ordered a new one.

Same goes for the MAF after I installed this 3" intake pipe MAF reading on idle gone down to 2g/s from approx 3.6. But WOT 90 or 100max. After sligtly adjusted MLHFM Idle came back ok 3.2-3.4. WOT still less than it should be it used to be 135 max with the previous intake system and original maf housing. This is a brand new Bosch sensor and reads the same as the old one so the problem not sensor related.

Regards to the MAF I either did the adjustments wrong or the problem is that the housing is a straight through metal no flow straightener in there like the original plastic housings the cone filter have a velocity stack tho. I dont know how much of a problem this flow straightener as some other owners gutted out they housings and had no issues afterwards.

I will do a double check around leaks and faulty hardwares that could play role, but mappingwise I need help please, and of course Im not expecting from anyone to spoon feed me, just point out stuff i might missed im happy to spend long hours to study but I need a little extra info here and there.


Here are my logs and my current bin+ XDF that I use for this project, also here a video of normal driving mixed with some WOT pulls with me7 logger.

https://www.youtube.com/watch?v=YHmgPH71hgk

Please help me a little bit guys cause Im out of ideas where i did things wrong.

Hi thanks for coming back to me. I greatly appreciate the effort.

-3" intake pipework with a large open cone filter.(original Bosch sensor from the A4 installed in the 3" intake
-Decat test pipe on the exhaust side.

Everything else is still stock. My next intention would be a FMIC.

Fuel : RON99 unleaded petrol (UK)
BEX Injectors : 317cc / 06A906031BA
Fuel pump : original ( Im intend to do a fuel pressure test soon to see how healthy it is )
Turbocharger is original, its a KKK K03S (longitudinal) / 06B 145 703B

Im going to get an unaltered S3 file and check out MHLFM and copy the values over and see how it runs with it. The intake pipe is about 37% bigger than the original. If i increased the whole MHLFM by 37% it yielded  20-20+ G/s @ idle, so i have reverted it back.