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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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      04-05-2018, 12:14 PM   #45
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Quote:
Originally Posted by ilivas View Post
It doesnít release ALL the excess pressure is what youíre saying. The pressure that is not released is still bounced back to the compressor. This is still a mild form of compressor surge. Itís not full on compressor surge, but some of the air still bouncing back to the turbo.

Some companies for turbo cars make multi piston designs to help mitigate this. I ran a tial single piston on my 700whp sti. It held boost but would get light surge, it does shorten the life of the turbo a bit, but not enough to where I would care since at that power level, things break a lot anyways on a 4 cylinder. In the grand scheme, GFB isnít a super high end bpv, so I wouldnít expect a lot out of it. People donít use those at high power levels.
You're misunderstanding this. At low RPM, the flutter is a result of the operation of the spring. If you don't press the pedal, all of the boost then exits. If you press the pedal, the valve continues and operation continues. This isn't surge and has no effect on your turbo or its life.
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      04-05-2018, 01:24 PM   #46
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Quote:
Originally Posted by BunkerJ View Post
You're misunderstanding this. At low RPM, the flutter is a result of the operation of the spring. If you don't press the pedal, all of the boost then exits. If you press the pedal, the valve continues and operation continues. This isn't surge and has no effect on your turbo or its life.
Youíre saying that the fluttering air noise you hear, is coming from the spring? Donít know about that.
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      04-05-2018, 01:27 PM   #47
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Youíre saying that the fluttering air noise you hear, is coming from the spring? Donít 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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      04-05-2018, 01:52 PM   #48
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Quote:
Originally Posted by BunkerJ View Post
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.
Thatís a little too much noise from a piston bouncing up and down.

Do you know how, a blow valve operates? The piston is actuated off vacuum and positive pressure from a vac line off the intake manifold.
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      04-05-2018, 02:02 PM   #49
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Thatís a little too much noise from a piston bouncing up and down.

Do you know how, a blow valve operates? The piston is actuated off vacuum and positive pressure from a vac line off the intake manifold.
You are welcome to live in denial and be arrogant. I understand how it works. If you want to argue with the engineers at GFB and other companies, be my guest. Otherwise, this is going nowhere. I presented you with the facts. You can take them or leave it.
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      04-05-2018, 02:29 PM   #50
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You are welcome to live in denial and be arrogant. I understand how it works. If you want to argue with the engineers at GFB and other companies, be my guest. Otherwise, this is going nowhere. I presented you with the facts. You can take them or leave it.
Lol. Okay. Have a nice day.
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      04-05-2018, 02:45 PM   #51
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Lol. Okay. Have a nice day.
You, too.
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      04-05-2018, 02:54 PM   #52
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Quote:
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That’s a little too much noise from a piston bouncing up and down.

Do you know how, a blow valve operates? The piston is actuated off vacuum and positive pressure from a vac line off the intake manifold.
Yeah.... our DV is operated electrically not by vacuum tho, like a traditional bov. I don't want argue with anyone but I'm with BunkerJ on this.
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      04-05-2018, 02:58 PM   #53
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Yeah.... our DV is operated electrically not by vacuum tho, like a traditional bov. I don't want argue with anyone but I'm with BunkerJ on this.
Spring and solenoid! It's fine. We can all bicker all we want. Knowledge was shared and hopefully, things have been learned.
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      04-05-2018, 03:03 PM   #54
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Quote:
Originally Posted by ilivas View Post
Quote:
Originally Posted by BunkerJ View Post
You are welcome to live in denial and be arrogant. I understand how it works. If you want to argue with the engineers at GFB and other companies, be my guest. Otherwise, this is going nowhere. I presented you with the facts. You can take them or leave it.
Lol. Okay. Have a nice day.
Bro your completely misinformed turbo flutter and compressor surge are two totally different things that are slightly similar which I get why your confused but honestly Gtfo with your arrogance and if someone corrects you on your shit take it like a man and learn from others rather than think your way is always correct. It's turbo flutter, this is NOT compressor surge,
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      04-05-2018, 03:23 PM   #55
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Originally Posted by IssaF32 View Post
Bro your completely misinformed turbo flutter and compressor surge are two totally different things that are slightly similar which I get why your confused but honestly Gtfo with your arrogance and if someone corrects you on your shit take it like a man and learn from others rather than think your way is always correct. It's turbo flutter, this is NOT compressor surge,
Sure, man. Turbo flutter. Lol

I do learn from others. Just not from you.
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      04-05-2018, 03:24 PM   #56
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Originally Posted by ilivas View Post
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Originally Posted by IssaF32 View Post
Bro your completely misinformed turbo flutter and compressor surge are two totally different things that are slightly similar which I get why your confused but honestly Gtfo with your arrogance and if someone corrects you on your shit take it like a man and learn from others rather than think your way is always correct. It's turbo flutter, this is NOT compressor surge,
Sure, man. Turbo flutter. Lol

I do learn from others. Just not from you.
Dude gtfo, your car is like you, Slow and stupid
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      04-05-2018, 03:28 PM   #57
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Dude gtfo, your car is like you, Slow and stupid
Lmao. 😂😂😂😂 have fun with your 300whp club. Gtfoh with that. Calling my car slow. Haha youíre probably making 1/4 of the power mine is. Have fun racing accords, while Iím racing liter bikes. 😂😂


Anyways, I was done arguing, and for some reason you have to instigate some more. Relax.

Last edited by ilivas; 04-05-2018 at 03:48 PM..
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      04-05-2018, 03:29 PM   #58
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Sure, man. Turbo flutter. Lol

I do learn from others. Just not from you.
That's what the forums are about. We all bring different pieces of the puzzle to form the picture. At the end, it's about being humble and taking responsibility. No hard feelings, I hope.

EDIT: But let's stop the flaming. Thread is about the DV, not speed or shit talking.
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      04-05-2018, 03:33 PM   #59
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Originally Posted by BunkerJ View Post
That's what the forums are about. We all bring different pieces of the puzzle to form the picture. At the end, it's about being humble and taking responsibility. No hard feelings, I hope.

EDIT: But let's stop the flaming. Thread is about the DV, not speed or shit talking.
Honestly, man. Iím not trying to be hostile. I do disagree and thatís fine. We donít have to agree. Iíve been doing the car thing for a long time and it happens on car forums all the time.

I just bought this f32 as my daily a few weeks ago, but I have supercharged/cam/meth c7 corvette as my ďfast carĒ and before that I had a built motor sti with precision 6265 turbo which was self tuned and built. Iím not new to the game, just new to this car.


Last edited by ilivas; 04-05-2018 at 03:38 PM..
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      04-05-2018, 03:33 PM   #60
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Dude gtfo, your car is like you, Slow and stupid
I don't think you're adding anything useful either. lol... gtfo bro car is slow and stupid. Okay.
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      04-05-2018, 04:05 PM   #61
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I love being the voice of reason in these disputes . both sides have presented their opinions and people deciding on whether or not they want to do a DV can decide for themselves at this point. the info is in this thread. no need for shit talking on this thread at least, stay on topic. I'm all for shit talking, but only on threads where it's invited/relevant
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      04-05-2018, 04:13 PM   #62
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Originally Posted by rjdnyy224 View Post
I love being the voice of reason in these disputes . both sides have presented their opinions and people deciding on whether or not they want to do a DV can decide for themselves at this point. the info is in this thread. no need for shit talking on this thread at least, stay on topic. I'm all for shit talking, but only on threads where it's invited/relevant
Youíre a nerd.

Jk jk. 😂😂
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      04-05-2018, 04:18 PM   #63
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Youíre a nerd.

Jk jk. 😂😂
alright bro fuck you, talk to my taillights next time you catch me at a stoplight.

*jokes*
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      04-05-2018, 04:29 PM   #64
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alright bro fuck you, talk to my taillights next time you catch me at a stoplight.

*jokes*
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      04-05-2018, 06:06 PM   #65
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Bicker in the comments of this vid lol

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      04-05-2018, 06:16 PM   #66
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Nice write up
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