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      02-26-2017, 01:28 PM   #1
cristy7610
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BOV squealing sound after inlets install

Hi
Yesterday I installed VRSF oem silicone inlets and now the Tial Bov has a pronounced low-toned squealing sound rather than the regular whoooosh sound.
I have the same sound like in this video

Is any fix for this sound?

Last edited by cristy7610; 02-26-2017 at 01:38 PM..
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      02-26-2017, 03:03 PM   #2
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+1 I have MMP inlets and tapped my manifold to use a 1/4" nipple and mine sounds exactly like this. Tried the 11psi and 10psi springs, I have a 7psi spring on the way just to try and see what effect it has on the sound
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      02-26-2017, 07:11 PM   #3
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There's a long thread that talks about this if you search. Making sure the tial has a full 1/4" line will help, but it will never sound exactly the same.
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      02-26-2017, 07:53 PM   #4
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Quote:
Originally Posted by ChefHaze View Post
There's a long thread that talks about this if you search. Making sure the tial has a full 1/4" line will help, but it will never sound exactly the same.
Yeah I've read through that whole thread, only solution was to apply the wastegate rattle fix a bit. Is there seriously no way to make Tial BOVs sound not shitty with inlets without adding some lag?
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      03-04-2017, 06:14 PM   #5
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Quote:
Originally Posted by madmantwo View Post
Yeah I've read through that whole thread, only solution was to apply the wastegate rattle fix a bit. Is there seriously no way to make Tial BOVs sound not shitty with inlets without adding some lag?
+1

(that is my video btw)
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      03-04-2017, 07:28 PM   #6
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Its not a "shitty" sound its clearly a byproduct of the material traits of the silicone inlet

sound better than a hollow plastic sound to me. i'm not sure why or how the style of inlet you have impacts the BOV sound, but it does.
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      03-04-2017, 10:45 PM   #7
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Is it possible that the amount of air flowing out of the BOV is increased with larger inlets, so it makes a whistling sound? I'm going to try a 7psi spring tomorrow just for kicks, seeing if opening the BOV more quickly prevents the squeal. Likely not, but I'll report my findings
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      03-05-2017, 12:20 AM   #8
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I had this sound when upgrading twins turbos from stock with forge diverter valves, inlet/outlet. When i drove it home (untuned for new turbos) it made this exact sound even on light boost (around 5-10 psi).

Week later I got it tuned and 95% is gone. Sound disappeared up to 18 psi and even then its only present if I WOT for 1-2 secs for quick passes during which time boost is around 18-21.

If i reload stock MHD stage 2 maps for these upgraded twins, squeal sound is back 95% of the time regardless of boost level.
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      03-05-2017, 01:16 AM   #9
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Quote:
Originally Posted by badblackcoupe View Post
Its not a "shitty" sound its clearly a byproduct of the material traits of the silicone inlet

sound better than a hollow plastic sound to me. i'm not sure why or how the style of inlet you have impacts the BOV sound, but it does.
I have grown used to the sound. I have tried 3 different springs, with shimming and without. Full 1/4" id vacum line. It just will never sound quite the same. I don't know for sure, but my personal opinion is that it has to do with the different length and volume of air in the inlets, just like changing the position of a trombone produces different sounds. In any case, it's a low priority to me as it works flawlessly otherwise.
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      03-05-2017, 10:17 AM   #10
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Update:
Few days ago I replaced the niple and vacuum line with (1/4 or 6mm ID)between Bov and intake manifold and the sound is much,much better now.In the next days I will put back the OEM Air Intake with drop K&N filter and see how it's sound in compare with BMS Dci intake ..
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      04-11-2021, 05:12 PM   #11
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Reviving an old thread. I have the exact same issue/sound after installing my inlets. My Tail BOV went from a nice woooosh sound, to the exact same hi pitched squeal as in the video above.

Did anyone find a fix for this??
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      04-13-2021, 08:12 AM   #12
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I too have the exact same pitch sound after my inlets install.... I'm using 1.75" silicone inlets, front and back, with BMS char pipe and tial BOV with whatever prong it came with from BMS.
Any help would be appreciated.... Thanks everyone.
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      04-13-2021, 10:18 AM   #13
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Two things I'm going to try.

1. I'm going to upgrade the hose that my BMS adapter came with to a true 1/4" ID line. The BMS line is 1/4" OD...with an ID a little larger than 1/8".

2. If that doesn't work, I'm going to put in a lighter BOV spring. I currently have the standard 10psi (18-20in/hg vacuum) spring is in, but I have a 7psi spring (14in/hg vacuum) spring to try out. It's going to be slightly open at idle since the motor makes around 18-19 in/hg at idle...but as soon as you crack the throttle it should close.

If that doesn't do it...I'm at a loss. I did search online, and it seems like a very common problem...but only with the Tail BOV's and aftermarket inlets.
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      04-14-2021, 06:59 AM   #14
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Well, I installed the larger 1/4" ID line to the BOV...no change in sound. Still sounds exactly like the sound in OP's video. My next step is installing a lighter 7psi spring in the BOV....if that doesn't help, maybe I will just try a different BOV all together.

The sound is horrible!!! And after searching all of the forums for days, it sounds like this is a pretty common problem right after people install inlets with there Tial BOV.
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      04-17-2021, 04:38 PM   #15
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Quote:
Originally Posted by iqraceworks View Post
Well, I installed the larger 1/4" ID line to the BOV...no change in sound. Still sounds exactly like the sound in OP's video. My next step is installing a lighter 7psi spring in the BOV....if that doesn't help, maybe I will just try a different BOV all together.

The sound is horrible!!! And after searching all of the forums for days, it sounds like this is a pretty common problem right after people install inlets with there Tial BOV.
If you went back to diverter valve recirculation, does it still make that squealing noise?
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      04-18-2021, 03:45 PM   #16
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Quote:
Originally Posted by iqraceworks View Post
Two things I'm going to try.

1. I'm going to upgrade the hose that my BMS adapter came with to a true 1/4" ID line. The BMS line is 1/4" OD...with an ID a little larger than 1/8".

2. If that doesn't work, I'm going to put in a lighter BOV spring. I currently have the standard 10psi (18-20in/hg vacuum) spring is in, but I have a 7psi spring (14in/hg vacuum) spring to try out. It's going to be slightly open at idle since the motor makes around 18-19 in/hg at idle...but as soon as you crack the throttle it should close.

If that doesn't do it...I'm at a loss. I did search online, and it seems like a very common problem...but only with the Tail BOV's and aftermarket inlets.
It's not just with the tial. I had this weird sound with my turbosmart diverter vented to atmosphere. It has something to do with the inlets. When I switched to relocated I added the tial bov and it sounds way better and it doesn't have that weird balloon sound. I'm not sure why, but it has something to do with the inlets.
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      04-18-2021, 09:40 PM   #17
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Quote:
Originally Posted by Saif2018 View Post
If you went back to diverter valve recirculation, does it still make that squealing noise?
Not sure....the stock diverters are long gone.
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      04-19-2021, 06:44 AM   #18
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Well, I put the new 7psi spring in the Tial BOV last night. It's definitely lighter, it's fully open at idle, which I'm not sure I'm a big fan of....but I can always switch it back to the 10psi spring.

Long story short......same screeching owl/chicken noise when I'm in boost and let off the throttle and the BOV opens. Larger 1/4" ID line, and 7psi spring.....no change at all. Kind of frustrating...it used to sound so good with the stock inlets on the car.

At this point, I guess I will just have to chalk it up as some strange resonance caused by the silicone inlets....I can't think of any other explanation. I guess I will just leave it until I get some different turbos later this summer....probably just put some PR relocated inlets on the car while I do the turbos. From everything I've read, they will get that nice "whooosh" sounds back from the BOV.
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      05-07-2021, 08:52 PM   #19
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LOL, I too went FBO recently with upgraded 1.75” VRSF inlets and a Tial q.10 BOV and it sounds similar to this. I would say BOVs actually sound better on manuals. My buddy’s 335I is a manual with relocated inlets and his still sounds good with the Tial BOV.

I’m not sure if it’s just my case but I have a DCT and I can even hear it whining up when I’m getting on the throttle?

Let me know if anyone else can achieve the cool Wsshhh sound originally without inlets, but with upgraded silicone inlets.
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      05-07-2021, 10:25 PM   #20
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Quote:
Originally Posted by iqraceworks View Post
Well, I put the new 7psi spring in the Tial BOV last night. It's definitely lighter, it's fully open at idle, which I'm not sure I'm a big fan of....but I can always switch it back to the 10psi spring.

Long story short......same screeching owl/chicken noise when I'm in boost and let off the throttle and the BOV opens. Larger 1/4" ID line, and 7psi spring.....no change at all. Kind of frustrating...it used to sound so good with the stock inlets on the car.

At this point, I guess I will just have to chalk it up as some strange resonance caused by the silicone inlets....I can't think of any other explanation. I guess I will just leave it until I get some different turbos later this summer....probably just put some PR relocated inlets on the car while I do the turbos. From everything I've read, they will get that nice "whooosh" sounds back from the BOV.
Did you tap your intake manifold or how are you using a 1/4" line now?
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      05-08-2021, 03:45 AM   #21
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Quote:
Originally Posted by BdSM n54iS View Post
Did you tap your intake manifold or how are you using a 1/4" line now?
I'm using the BMS adapter that hooks up right next to the throttle body....big ports in the adapter, plenty of flow. I'm running a true 1/4" is line. Before with the smaller 1/8" ID line.....it sounded the same. I did a short video showing the BOV when I would rev the motor....it's opening very fast, no delay at all.

The sound has something to do with the silicone inlets...I just don't know what.
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      05-08-2021, 04:50 AM   #22
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If I get inlets, do I have to have BOV, or make do with my Diverter Valve setup?
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