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Old Apr 27, 2014 | 07:13 PM
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Well I've pully'd down for more boost, but now I have so much noise at part throttle that's its irritating to drive.
I have a 50mm trial Q now, and was wondering if anything can be "added" to "muffle" it, or do I need to pick up something else?
I don't really want to run a recir and have to run plumbing everywhere, but I can't handle this part throttle noise.

Last edited by Blow Torch; Apr 27, 2014 at 07:44 PM.
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Old Apr 27, 2014 | 07:35 PM
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i installed a second tial 50mm to tone down the noise, its still loud but i can put up with it now.
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Old Apr 27, 2014 | 07:42 PM
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Filter around it?
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Old Apr 27, 2014 | 07:46 PM
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Originally Posted by danieloneil01
Filter around it?
I was trying to figure out how to do something like that, but not sure what to use and how much it would affect the noise AND it's performance
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Old Apr 27, 2014 | 10:13 PM
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I think a vendor uses this on one of their centri kits.
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Old Apr 28, 2014 | 10:17 AM
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Any idea who the vendor is?
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Old Apr 28, 2014 | 08:23 PM
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One reply said to change the spring to something in the 12 range, but I thought those were only for turbos, and I would be in partial boost without the bleed off
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Old Apr 28, 2014 | 08:27 PM
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PM or email AA. I think it might be them.
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Old Apr 28, 2014 | 08:58 PM
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Originally Posted by danieloneil01
PM or email AA. I think it might be them.
A&A uses Turbo smart or Vortech BPV.
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Old Apr 28, 2014 | 09:52 PM
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Okay, but do they include a filter that goes around the bypass valve?
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Old Apr 28, 2014 | 11:21 PM
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Originally Posted by danieloneil01
Okay, but do they include a filter that goes around the bypass valve?
Yes they do.
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Old Apr 29, 2014 | 09:14 AM
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Originally Posted by danieloneil01
Okay, but do they include a filter that goes around the bypass valve?
They do but I dont think it will work in the same fashion. From what I remember my Tial Q looks different than the one A&A uses with the side exit and filter.

The other 2 Tial BOV choioces may be quieter and even have a filter on it. If you wanted to sell yours and keep current size flange etc. I'm sure someone would buy it quickly

http://www.tialsport.com/index.php/tial-products/bovs

The one that comes with the new A&A kits is quiet for sure but with a bigger blower and more boost should sound pretty sweet.

Last edited by PEETYZ; Apr 29, 2014 at 09:42 AM.
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Old Apr 29, 2014 | 09:19 AM
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I have a Mondo 50mm BOV I may be interested in trading for your Tial Q. PM me man!
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Old Apr 29, 2014 | 04:18 PM
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I found a replacement bottom of a QR to swap the out the Q for about $50. I figure I can install a filter on it and MAYBE it will quiten it down.
Love the sound of it "popping off" but hate the part throttle "hissing"
Just don't want to reduce it's ability to do its job of reliving the pressure when the throttle is released..................
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Old Apr 29, 2014 | 04:57 PM
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Originally Posted by Blow Torch
Well I've pully'd down for more boost, but now I have so much noise at part throttle that's its irritating to drive.
I have a 50mm trial Q now, and was wondering if anything can be "added" to "muffle" it, or do I need to pick up something else?
I don't really want to run a recir and have to run plumbing everywhere, but I can't handle this part throttle noise.
What spring do you currently have in your bov? You can use a stiffer spring to keep the bov closed more often to decrease the sound.

- 2psi..............pink spring
- 6psi..............black spring
- 8psi..............white spring
-10psi.............unpainted
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Old Apr 29, 2014 | 05:36 PM
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lol I always get dirty looks and complaints from people driving next to them with their windows down while I am right next to them. Love my street sweeper!!!
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Old Apr 29, 2014 | 07:02 PM
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could try a good old wrist/sweat band for jogging.. Just stretch it over the BOV.. worth a try and only a couple bucks and still should let the boost out without a problem.


Lol or you can get the "SPOON" covers like the honda's use

Last edited by RedZMonte; Apr 29, 2014 at 07:05 PM.
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Old Apr 30, 2014 | 09:40 AM
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Originally Posted by 95vettski
What spring do you currently have in your bov? You can use a stiffer spring to keep the bov closed more often to decrease the sound.

- 2psi..............pink spring
- 6psi..............black spring
- 8psi..............white spring
-10psi.............unpainted
It has the 2psi, that was recommended by several blower vendors. Someone else mentioned changing the spring, but I wonder what the downside would be. One a closed valve keep sending me into boost, killing gas mileage?
It's cool to have a little noise, but with a high stalled auto, but when you are easing up a steep driveway, or something similar, it just sounds "broken"

Red Z; I like those sweat bands. I wondered what would slip over the BOV....
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Old May 3, 2014 | 04:29 PM
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Originally Posted by Blow Torch
Well I've pully'd down for more boost, but now I have so much noise at part throttle that's its irritating to drive.
I have a 50mm trial Q now, and was wondering if anything can be "added" to "muffle" it, or do I need to pick up something else?
I don't really want to run a recir and have to run plumbing everywhere, but I can't handle this part throttle noise.
Filter quietened down my bypass, you could run pipe or tube down farther into engine bay. Might help?
Also I do have a question, does your BOV vent at idle & cruze speed/lite throttle? I've been told BOVs' aren't open at idle.
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Old May 4, 2014 | 08:13 PM
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Originally Posted by RedZMonte
could try a good old wrist/sweat band for jogging.. Just stretch it over the BOV.. worth a try and only a couple bucks and still should let the boost out without a problem.


Lol or you can get the "SPOON" covers like the honda's use
OK; THAT DIDN'T WORK!!!
I installed the sweat band over it and when I gave it some throttle, IT WOULD'T MOVE I don't know if it kept it from venting and it went rich or what, but I had backed off of the lift and I didn't think it was going to pull back on

M5
Yes, it vents at idle and anything below any point where you have more than 2-3lbs vac.
Mine is annoying to me at part throttle because I have a stall and it magnifies the problem, especially when I am pulling into a incline driveway
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