[BunkerJ]

Originally Posted by ilivas

Honestly, man. I’m not trying to be hostile. I do disagree and that’s fine. We don’t have to agree. I’ve 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 “fast car” and before that I had a built motor sti with precision 6265 turbo which was self tuned and built. I’m not new to the game, just new to this car.

No, I understand and can tell. It's just with these cars, the ECU is what controls it and technically the spring if you consider the stiffness the control. Unless it were changed in a tune, it's really good about ensuring there isn't any surging.

[Solidjake]

BunkerJ Does the flutter sound come in also on load? Can you make a vid of the sound while driving? (maybe put your phone or camera in the engine bay to get the best sound. Thanks

[BunkerJ]

Originally Posted by Solidjake

BunkerJ Does the flutter sound come in also on load? Can you make a vid of the sound while driving? (maybe put your phone or camera in the engine bay to get the best sound. Thanks

No, it doesn't. Low RPM/Boost only. See first page for my video.

[Solidjake]

Originally Posted by BunkerJ

No, it doesn't. Low RPM/Boost only. See first page for my video.

Yup I did see it, just wanted to confirm for driving with load

[BunkerJ]

Originally Posted by Solidjake

Yup I did see it, just wanted to confirm for driving with load

I get it much less when under load and really only if I cut it before 3k RPM, otherwise it doesn't flutter. Much harder with the bigger turbo. If someone with the stock turbo gets flutter, they could do it for sure.

[ilivas]

How much louder is this than the stock one? I installed an Injen intake expecting to the DV to be super loud. It’s definitely louder, but not what I had in mind.

I even left the cover off the intake.

[BunkerJ]

Originally Posted by ilivas

How much louder is this than the stock one? I installed an Injen intake expecting to the DV to be super loud. It’s definitely louder, but not what I had in mind.

I even left the cover off the intake.

It's the same noise, if not quieter at sometimes. You will get some valve flutter, which is nice to hear. I wouldn't expect it to be louder.

[ilivas]

Originally Posted by BunkerJ

It's the same noise, if not quieter at sometimes. You will get some valve flutter, which is nice to hear. I wouldn't expect it to be louder.

I’ve been driving around all day, it’s starting to grow on me.

[Solidjake]

BunkerJ ilivas

I sent this to GDP and their response

Hey guys. I purchased the T9357 DV+ for my 2013 BMW 328i N20. I'm ready to install but there has been discussion on the forum that this created compressor surge. can you please shed some light on this.

and the forum link http://f30.bimmerpost.com/forums/sho....php?t=1482708

Their reply

Hi Jake,



The surge in this video is not correct, that is showing you that the DV+ is not working as it should. 99 times out of 100, it is because the factory solenoid (which you are reusing when fitting the T9357) has failed. We have sold thousands of these with no issue, so if there was an issue with our products, we would definitely know about it and rectify the issue. Basically if you fit the DV+ and it sounds like this, look further into it. The only way the DV+ could be responsible for this is if the piston was jammed shut, which is really not possible as each body is matched to a specific piston diameter before they are boxed and sent out. Hope this helps somewhat. Let me know if you have further questions.



Regards, Jonathan



Jonathan Tsiklas | Mechatronics Engineer

Go Fast Bits
No 2, Norman Street, Peakhurst 2210

T +61 2 9534 0099 | F +61 2 9534 3999

E jonathan.tsiklas@gfb.com.au | W www.gfb.com.au

[BunkerJ]

Originally Posted by Solidjake

BunkerJ ilivas

I sent this to GDP and their response



Their reply

I'm going to email it because that makes zero sense. You framed the question incorrectly stating that this WAS compressor surge. What also doesn't make sense is that I have had this on both of my turbos, one of which is a brand new solenoid. Secondly, they clearly state that flutter is normal. So either they're going back on their word or he was severely misled by the wording of your question.

[BunkerJ]

Originally Posted by Solidjake

BunkerJ ilivas

I sent this to GDP and their response



Their reply

Another GFB response regarding flutter from another user. I sent off my email to completely clear the air as well. Probably won't get a response till tomorrow.


User:
Sometimes while only boosting a couple PSI or accelerating while still in vacuum and then coming off the accelerator there is a flutter noise. Before everyone get's there panties in a bunch THIS IS NOT COMPRESSOR SURGE.

The flutter is due to the way the DV+ operates and is normal.

Here is GFB's response to the flutter noise:

GFB:
We recommend using the main spring unless there is a reason not to, so that throttle response is optimized, since that’s one of the key reasons to replace the factory valve (as well as longevity and boost-holding). As the tech article explains, the turbo will make a different sound under certain conditions at low RPM (only noticeable with an aftermarket intake), which is not compressor surge and is not harmful to the turbo or engine, but nonetheless some people may not like it. In that case, removing the spring will make the DV+ behave like the factory valve, so the different noise will be gone.

The boost pressure and turbo are fairly irrelevant as far as the main spring go. You could potentially say as a blanket rule to the guys with a DSG gearbox that they can install the DV+ without the spring, because throttle response on gearshift is much less important than it is to the manual guys. Personally however, I’d always take the opportunity to improve throttle response by installing the spring and taking it out if necessary, rather than not installing it and never knowing potentially what I’m missing. That’s really the whole point of modifying something. There’s absolutely no harm in trying it – the worst that will happen is you don’t like the noise in which case you take it out.

[ChubbyWilly]

Originally Posted by BunkerJ

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.

Pardon me if someone already mentioned this but.. that is the sound a fake DV+ makes. Where did you buy yours from? Budy of mine had a fake one and a real one to show me.

[BunkerJ]

Originally Posted by ChubbyWilly

Pardon me if someone already mentioned this but.. that is the sound a fake DV+ makes. Where did you buy yours from? Budy of mine had a fake one and a real one to show me.

The DV+ is 100% real and bought from a reputable dealer. Hell, even then I checked to make sure.

While I can't say a fake DV+ will make this sound, the real DV+ will also make this sound and it's not incorrect. I don't want to sit here and type out the exact reasoning of how this thing works again, but I will say again: If you get flutter under low throttle, low boost, low RPM, you name it, this is completely NORMAL. If you are receiving flutter in the higher RPM range, under high boost, or even while you're still on the gas, then yes, this is wrong and actually compressor surge.

Originally Posted by Solidjake

BunkerJ ilivas

I sent this to GDP and their response



Their reply

Regarding the email above, I was correct in saying that the question and lack of information led Jonathan astray. I took it upon myself to email him with the full details, as explained in this thread, and guess what: I got the correct response. Not trying to rip on you, but this just goes to show that you must be specific in how you phrase a question and make sure to provide the correct details; otherwise, we clutter the thread with... Dare I say it? Fake news? Lol. Here is the response from Jonathan:

Hi Justin!



Thanks for contacting us, we are always here to help. A vital bit of information I was missing was that the surging was not there in the higher RPM range. If it was doing this in the high RPM range, then this would definitely be a concern, so the fact that it’s only surging at light load really isn’t a concern for the turbocharger’s safety. What needs to be understood too is that the ECU is controlling all the operation of the valve, and essentially the DV+ works as a slave to the ECU signal. Some vehicles ECU’s simply do not trigger their valves till certain RPM/loads have been met. So do not worry because none of your setup is in threat of its safety 😊



Let me know your thoughts.





Regards, Jonathan



Jonathan Tsiklas | Mechatronics Engineer

Go Fast Bits
No 2, Norman Street, Peakhurst 2210

T +61 2 9534 0099 | F +61 2 9534 3999

E jonathan.tsiklas@gfb.com.au | W www.gfb.com.au

Description: Logo thumbnail

[ChubbyWilly]

Originally Posted by BunkerJ

The DV+ is 100% real and bought from a reputable dealer. Hell, even then I checked to make sure.

Did you buy it directly from GFB? I can't find the manual for DV+ i've seen but even they said that a flutter sound is not right. It should make a swoosh sound all the time.

[BunkerJ]

Originally Posted by ChubbyWilly

Did you buy it directly from GFB? I can't find the manual for DV+ i've seen but even they said that a flutter sound is not right. It should make a swoosh sound all the time.

No, I did not.

Did you fail to read my last post or any others that I made in this thread?

[ilivas]

He did say it was surging at light load. It’s probably not serious to the turbo, but it’s still surge.

[BunkerJ]

Originally Posted by ilivas

He did say it was surging at light load. It’s probably not serious to the turbo, but it’s still surge.

Meh, I'm over surging at this point. Too many flip-flop answer from GFB on confirming it's surge or confirming it's not. I take it as non-harmful to the turbo and pin it there.

But regardless, confirmed several times as noted that the noise is normal.

[ilivas]

Originally Posted by BunkerJ

Meh, I'm over surging at this point. Too many flip-flop answer from GFB on confirming it's surge or confirming it's not. I take it as non-harmful to the turbo and pin it there.

But regardless, confirmed several times as noted that the noise is normal.

A little surge isn’t going to hurt much. There are some cars that run around with no blow off valve at all and get full on and constant compressor surge.

I had a super heavy spring in my STI blow off valve because I needed it to hold boost at 42psi. The drawback is it wouldn’t open at lower boost and partial throttle because the spring was so stiff. Turbo lasted quite a while.

[ilivas]

Does the stock one leak after increasing boost? I ordered one. I saw that with the n55 charge pipes, you can get them with tial flanges for tial bovs. I wish they had them for this.

[BunkerJ]

Originally Posted by ilivas

Does the stock one leak after increasing boost? I ordered one. I saw that with the n55 charge pipes, you can get them with tial flanges for tial bovs. I wish they had them for this.

They can. Similar to the stock CP, they have a chance. Mine was leaking some around 85k. That was about 20k of +4-6PSI over stock

[ilivas]

Originally Posted by BunkerJ

They can. Similar to the stock CP, they have a chance. Mine was leaking some around 85k. That was about 20k of +4-6PSI over stock

I wasn’t sure if it just wasn’t able to hold higher pressures. The stock STI valves won’t hold more than 20psi before it starts leaking. The spring was too weak

[BunkerJ]

Originally Posted by ilivas

I wasn’t sure if it just wasn’t able to hold higher pressures. The stock STI valves won’t hold more than 20psi before it starts leaking. The spring was too weak

Ah, gotcha. Yeah, spring can take it, but you risk tearing the diaphragm on these ones.