MMP Stage 3 won‘t hit boost target

MIT_N54

New Member
Feb 25, 2022
1
0
0
Hey guys, got a problem with my 335i N54 with MMP Stage 3 turbos.

Modlist:
- MMP Stage 3 Turbo
- VRSF Inlets
- 7“ Intercooler
- Phoenix racing CP
- RS6 diverter valves (new)
- N20 Map (new)
- Silicon inlets
- Upgrade PCV
- OCC
- new boost solenoids
- Custom tune in the making right now
- silicone vac lines

Car wont boost over 18-19 psi (log attached) and it throws the legendary 30FF code while under WOT. I checked boost piping und vac lines but i couldnt find any leak or something. While building boost I think i can hear some compressor surge too.

Logs atteched

I hope some of You guys can help me out
 

Attachments

  • 2022-03-20 16_54_38 I8A0S VC30729_N54-MMPS3_100ron_B4R0.6.mhd.csv
    31.1 KB · Views: 30

MR-KRAKA

Specialist
May 23, 2020
79
52
0
You either have a boost leak or need your vacuum lines to WG checked out/replaced. After that look into you boost control solenoids. You should also make sure your WG arms are closing at spec with vacuum. Those turbos are working way too hard to get 20psi as is.

Edit:
I didn’t see you have all new bcs and vac lines. May also want to look in the possibility of inlets collapsing or your new diverters acting up. Those could explain the noise
 

The money pit

New Member
May 30, 2022
9
0
0
You either have a boost leak or need your vacuum lines to WG checked out/replaced. After that look into you boost control solenoids. You should also make sure your WG arms are closing at spec with vacuum. Those turbos are working way too hard to get 20psi as is.

Edit:
I didn’t see you have all new bcs and vac lines. May also want to look in the possibility of inlets collapsing or your new diverters acting up. Those could explain the noise
i just checked rear inlet i believe is collapsing i pulled it off just to the front of the lip so its still somewhat covered heres the log

 

NoGuru

Captain
Jan 9, 2018
1,202
586
0
Just North of Detroit
Ride
BMW 335is
It's taking so long to build boost. If you think its an inlet collapsing I would not do many more pulls. I had a new set of turbos blow due to the rear inlet collapsing. Make sure it does not have any kink in it.
 

The money pit

New Member
May 30, 2022
9
0
0
It's taking so long to build boost. If you think its an inlet collapsing I would not do many more pulls. I had a new set of turbos blow due to the rear inlet collapsing. Make sure it does not have any kink in it.
So I went under there a took about 4 extensions and pried it off just a bit it has been hitting boost but now I need to either order a completely different brand of inlet or try and figure out how to make this one work