[Saif2018]

Originally Posted by KnobDE

These are OEM MHI (Mitsubishi) turbos.

A local shop did it for me, they did a lot to my car in the past and I was always more than pleased, but this time I´m still struggling to get them fix this for me, didn´t pay anything yet to them tho ..

Wednesday (9.12) I´ll let my car check with smoke, to find the boost leak, also they will check if everything was installed properly (A/C is already empty, it wasn´t really tight under the air box).

Another thing I noticed with stage 2, if I start the car in the morning and start driving, it howls pretty loud, coming from the turbos, I don´t have that with Stage 0. Either its a hard boost leak or on of the turbos is already trash

New turbos shouldn't be trash mate, most likely something else is causing the issue.

Boost leak test should help,

[KnobDE]

Did a boost leak test at 2 workshops now, non of them could find anything..

[Jonas225]

Just found that thread...i had the same situation back then when i first flashed MHD. Much quieter with any stage.

The reason is that there are different stock softwares. This "problem" only exists with I8A0S. Earlier models (2006 - 09/2007) often had extensive wastegate rattle. BMW created an update with less wgdc off boost (pre control table / MHD rattle fix option) as standard for these older models. You can feel the turbo lag with that software.

There was a service action, where the wastegates or turbos were replaced by BMW under warranty. Only if that action was performed, the more quiet software was flashed again.

If you want that "quiet" stock software, just add "WGAK" to your VO, and let IS*A-P calculate a measures plan. It will give you the ZB number which you can flash with IS*A-P or WINK*P.