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      04-05-2018, 12:27 PM   #47
BunkerJ
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Drives: 2013 328i
Join Date: Mar 2017
Location: San Diego, CA

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Quote:
Originally Posted by ilivas View Post
You’re saying that the fluttering air noise you hear, is coming from the spring? Don’t know about that.
I provided a nice long explanation a page back that explained this. Yes, the fluttering noise is associated with how the DV+ operates, which correlates to the spring. It's a fact, not an opinion. As you let off at low RPM, the low amount of boost escapes (Yes, all of it unless you cut it off with acceleration) but due to a stiffer spring, it bounces and causes the fluttering effect. It does not send boost back into the turbo at any rate.
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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
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