Need Help! Turbo Whine?!

[N54Lee]

Whats up everyone, I just recently got a hold of a beautiful looking 335i.


The car had some some stuff when I bought it, but it was not tuned.


BMS Intakes
Fmic
Vargas CHRA Replacements


Once I got it I immediately flashed MHD Stage 1+


Everything was going smooth so I got some DP's and flashed Stage 2+


Everything was going good, car pulled strong and hard then all of a sudden I got this whining noise and it was making no boost. Logs show that it never went over .5psi which I believe is Limp mode.


Checked underneath the car to find out that the rear inlet slid off of the turbo, but while I was trying to put it back on it had cracked...I figured not a problem and ordered VRSF Stock location silicone inlets.


Got them installed and started the car up...whine is still there! MHD Pulls a code 30ff ONLY under load, after idling for about 1 or 2m the cel goes off.


Heres what I have tried:


-Put stock DP's back on
-Replaced all vacuum lines
-Replaced both turbo to downpipe gaskets
-Flashed back to MHD Stage 0


Whats weird is if I start it on a cold start, the whine is very noticeable but eventually goes away. Once it does the only time you can hear it is under load or revving it above 3k+.


Any ideas!? I uploaded some videos so maybe that can help yall undertstand

[Sticky]

Where are you located?
@Itsbrokeagain @alex@ABRhouston

[N54Lee]

I'm located in the inland empire. About 1 hour and a half away from LA in CA

[N54Lee]

Maybe this can give any hints as to what it is? Im seriously stumped.

[iminhell1]

Those line go to the Boost Control Solenoids.
They are just ahead of the coolant tank on the valvecover.
The outlet line from the BCS goes to the Wastegate Actuator.
Figure out which BCS is howling and then which actuator it's going to. The line on that actuator is probably slipped off.
(with your luck it'll be the rear which is a PITA to get at.)

[Harb714]

Hey @N54Lee did you ever get this issue resolved??? Im having the same whining sound and canot figure it out yet, any help would be appreciated. Thank you!

[N54TT]

Hey @N54Lee did you ever get this issue resolved??? Im having the same whining sound and canot figure it out yet, any help would be appreciated. Thank you!

If the whine continues when you're driving, one or both of the turbo(s) is shot. Mine was whining a lot after 15,000 miles of max boost and 95% WGDC lol once I upgraded the turbos the whining sound went away.