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      04-20-2018, 06:17 PM   #111
BunkerJ's Avatar

Drives: 2013 328i
Join Date: Mar 2017
Location: San Diego, CA

iTrader: (0)

Whilst doing some research, I realized there was a big section on the flutter thing right there in the instructions. Just wanted to share with everyone who might be worried about the safety of it. Keep in mind, it doesn't talk about when it's bad. Remember, if you install the DV+ on the car and it "flutters" while on the throttle or after a high RPM/high boost throttle release, it is likely compressor surge. Additionally, further research shows that it mainly happens to those with a bigger, aftermarket FMIC or turbo, which explains why some are getting flutter and some are not.

The DV+ can be configured in two different ways, depending on your desired outcome. Fitting the DV+ with the main spring installed as shown on the previous page can be thought of as a “Sport” mode, offering the best possible throttle response and boost recovery during on/off throttle applications (i.e. during gearshift with a manual transmission).

Using the main spring means the DV+ can open and close progressively in response to how much boost pressure is present, unlike the factory diverter which just opens fully regardless of whether there is boost to vent or not. Because this operation method is different from the factory diverter, it is not unusual or detrimental to hear a different sound from the intake when lifting off the throttle at low RPM, especially if you have an aftermarket intake or a larger turbo installed.

Additionally, in some cases this different operating method may be mis-interpreted by the ECU as a faulty diverter valve (it simply sees the diverter doing something different, it doesn’t know the diverter is actually attempting to improve throttle response), resulting in fault code P2261 being recorded. This does not indicate that the DV+ is faulty, nor does it cause any issues to the turbo or engine.

If the fault code or different sound occurs and you want to prevent it, or you simply want a direct replacement for the factory diverter that is stronger, holds boost better, and lasts longer, you can choose
to install the DV+ WITHOUT the main spring behind the piston. This configuration can be thought of as an improved “Standard” mode, which behaves just like the factory diverter, but with the added benefits of better boost-holding, strength, and reliability.

2013 F30 328i: MHI Big Turbo, GFB DV+, Mishimoto CAI, ER TIC/CP/Catless DP, AWE Touring Quad Exhaust w/ Resonated Midpipe, NGK LI Plugs, BM3 with PTF Stage 2 91 AGG Tune, Fuel-it Stage 2 LPFP, Solowerks S1 Coilovers, and DEPO/M-Sport Retrofit