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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > N20 GFB DV+ installed without moving or touching the turbo! +quick tutorial
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      04-03-2018, 10:11 PM   #1
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Just installed gfb DV+ without touching or moving the turbo it took about 1 hour and 15 mins and had to make a custom tool but got it done. Took it for a ride just now after car warmed up and yeah you can tell the different at high rpm and shifts pulls stronger or maybe It my mind playing gaming with me lol.


The way I installed it (do at your own risk)

1)Remove intake.
2)Move the wastegate out of the way, held by two screws (mine was EWG)
3)Discount the charge pipe, the side of the turbo outlet (gives you a lot room)
4)Use a 4mm long round head allen key to unscrew the 3 bolts holding the DV
After removing DV and follow GFB instruction.
5)Installing DV is bit tricky now, install GBF part first the then the OEM DV part. They won't fit together so don't try.
6)Hand tighten the bolts.
7)Get a long 5mm round head allen key and grind the body smooth, that's the key because without doing this the tool will not fit!
8)Tighten it, reassemble the rest, and enjoy!
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Last edited by 1SLO4G; 04-04-2018 at 03:06 PM.. Reason: Added a short tutorial
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      04-03-2018, 10:52 PM   #2
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congrats. I know a lot of members have struggled with getting these in easily. mind explaining to me what these do though? what are the benefits?
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      04-03-2018, 10:57 PM   #3
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Quote:
Originally Posted by rjdnyy224 View Post
congrats. I know a lot of members have struggled with getting these in easily. mind explaining to me what these do though? what are the benefits?
Very impressive. If you have a tool small enough to reach back there, it can be done for sure.

Benefits are that you retain more boost on shifts. The stock DV has about six holes or so to vent the boost, while the DV+ has one. The reason most people replace it aside from the retained boost is that similar to the stock CP, the stock DV is subject to tearing, which leads to boost leaks. For me, it was performance and preventive. Also, I got some niiiiiice flutter out of mine. Sounds great when she shifts now.
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      04-03-2018, 11:12 PM   #4
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Quote:
Originally Posted by BunkerJ View Post
Quote:
Originally Posted by rjdnyy224 View Post
congrats. I know a lot of members have struggled with getting these in easily. mind explaining to me what these do though? what are the benefits?
Very impressive. If you have a tool small enough to reach back there, it can be done for sure.

Benefits are that you retain more boost on shifts. The stock DV has about six holes or so to vent the boost, while the DV+ has one. The reason most people replace it aside from the retained boost is that similar to the stock CP, the stock DV is subject to tearing, which leads to boost leaks. For me, it was performance and preventive. Also, I got some niiiiiice flutter out of mine. Sounds great when she shifts now.
Thank you for suming it up!

I wish I had done some logs before and after tho I'm playing around OBD fusion at this time I'll be giving my 2 cents on it shortly and comparing the accuracy to bm3 logs.
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      04-03-2018, 11:21 PM   #5
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Quote:
Originally Posted by 1SLO4G View Post
Thank you for suming it up!

I wish I had done some logs before and after tho I'm playing around OBD fusion at this time I'll be giving my 2 cents on it shortly and comparing the accuracy to bm3 logs.
Nice! Now get a big ol' tablet in there!

EDIT: I have to compensate for that 6" screen
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      04-03-2018, 11:27 PM   #6
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That's awesome!
Are you running that wired to the tablet via enet or using a wifi agent adapter?
Also, window or ios can't really tell in the pic.
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      04-03-2018, 11:42 PM   #7
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Quote:
Originally Posted by 1SLO4G View Post
That's awesome!
Are you running that wired to the tablet via enet or using a wifi agent adapter?
Also, window or ios can't really tell in the pic.
The wifi agent via hotspot on the tablet. It's an Android tablet, Galaxy Tab E to specific. PM me if you plan to get a wifi agent!
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      04-04-2018, 12:15 AM   #8
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Post a video of shifting pleaseeee
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      04-04-2018, 12:22 AM   #9
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Quote:
Originally Posted by tonyec7 View Post
Post a video of shifting pleaseeee
I'll be making videos Saturday and Sunday, during and after autocross.
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      04-04-2018, 09:40 AM   #10
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post a pic of that tool you made it might motivate me to install mine lol
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      04-04-2018, 10:13 AM   #11
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Quote:
Originally Posted by tonyec7 View Post
Post a video of shifting pleaseeee
+1. and BunkerJ, thanks for the explanation. I would love to hear a video of that flutter too.
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      04-04-2018, 10:14 AM   #12
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Quote:
Originally Posted by Domotron View Post
post a pic of that tool you made it might motivate me to install mine lol
It was 6mm around head Allen key, then I Rounded the body with a bench grinder. That was for the installation because removal was easy. After that you will have room between the block and dv.
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      04-04-2018, 10:53 AM   #13
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Quote:
Originally Posted by rjdnyy224 View Post
+1. and BunkerJ, thanks for the explanation. I would love to hear a video of that flutter too.
Please excuse the dirty engine bay and my voice lol. It was the one video I took so far and was trying to make sure it wasn't a fluke in the install.

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      04-04-2018, 11:44 AM   #14
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Quote:
Originally Posted by BunkerJ View Post
Please excuse the dirty engine bay and my voice lol. It was the one video I took so far and was trying to make sure it wasn't a fluke in the install.

Im going to post mu turbo flutter and my stage 2 ots map agg today so you guys get a good idea of how loud it is.
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      04-04-2018, 02:04 PM   #15
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I only see these for N20. Would this work for N26? Thanks
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      04-04-2018, 02:22 PM   #16
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Originally Posted by lonecitizenfour View Post
I only see these for N20. Would this work for N26? Thanks
Yes. Same thing for the turbo.
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      04-04-2018, 02:29 PM   #17
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do you have a tutorial of how you installed the gfb
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      04-04-2018, 02:32 PM   #18
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Originally Posted by dargorbr View Post
do you have a tutorial of how you installed the gfb
I do not but I'll add it to my main post later on how I did it.
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      04-04-2018, 05:09 PM   #19
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Quote:
Originally Posted by BunkerJ View Post
Please excuse the dirty engine bay and my voice lol. It was the one video I took so far and was trying to make sure it wasn't a fluke in the install.

damn that sounds nice! like, wow. do you think that flutter sound will still be achieved with the OEM intake system? also, any downsides to doing a DV? will it require a flash tune?
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Last edited by rjdnyy224; 04-04-2018 at 05:26 PM..
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      04-04-2018, 05:55 PM   #20
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Quote:
Originally Posted by rjdnyy224 View Post
damn that sounds nice! like, wow. do you think that flutter sound will still be achieved with the OEM intake system? also, any downsides to doing a DV? will it require a flash tune?
It's possible, but unlikely. Stock intake silences the DV already. Even with the hood closed and inside the car driving, it has to be relatively quiet to hear the flutter. It's not the same flutter if you had no DV/BOV and were kicking the boost straight back. No downsides that I can think and no tune required.
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      04-04-2018, 08:20 PM   #21
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Quote:
Originally Posted by BunkerJ View Post
It's possible, but unlikely. Stock intake silences the DV already. Even with the hood closed and inside the car driving, it has to be relatively quiet to hear the flutter. It's not the same flutter if you had no DV/BOV and were kicking the boost straight back. No downsides that I can think and no tune required.
so how does the GFB DV+ create that flutter sound then? correct me if I'm wrong, but the flutter sound is the sound created when a turbo spins backwards because already compressed air wasn't diverted/recirculated. but, if this DV (and the factory one, I suppose) recirculates air back into the intake system, how come you still get the flutter sound? my knowledge of DVs is basic at best, so please correct me if my understanding is incorrect. just looking for some clarification.
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      04-04-2018, 10:28 PM   #22
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Quote:
Originally Posted by rjdnyy224 View Post
so how does the GFB DV+ create that flutter sound then? correct me if I'm wrong, but the flutter sound is the sound created when a turbo spins backwards because already compressed air wasn't diverted/recirculated. but, if this DV (and the factory one, I suppose) recirculates air back into the intake system, how come you still get the flutter sound? my knowledge of DVs is basic at best, so please correct me if my understanding is incorrect. just looking for some clarification.
Flutter is created from boost hitting the blades while it's spinning. Think of a fan turned on and you blowing into it. The DV+ does this when you let off the pedal and the boost tries escape, it's now going through one hole, so some is bound to go back. That's why it's not as loud as your normal flutter, but loud enough to hear while in the car.

EDIT: See second page. I asserted the wrong flutter.
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