[s-cars] blow off valve orientation... was Re: Fluttering Sou ndfrom Turbo?

[James Murray (QA/EMC)]

Bill, for an aftermarket BPV there is no diaphram, it's a piston. So as I understand the reasoning is to put it in backwards to the air flow is not pushing on the pistion but on the side of the piston. The original BPV is a diaphram design which more like a valve... so the design is different.

/Jamu.

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]
Sent: Wednesday, August 10, 2005 12:13 PM
To: djdawson2 at aol.com; fastscirocco_2000 at yahoo.com;
da5150_2000 at yahoo.com; s-car-list at audifans.com
Subject: Re: [s-cars] blow off valve orientation... was Re: Fluttering
Soundfrom Turbo?


I think no matter which way it goes, the boost is still hitting the bottom of the piston.
If connected the original way, the boost is on the donut shaped area around the outside of the bottom of the piston....if connected the new (backwards) way, the boost is now in a 3/4 circular area in the center as you mention below, and on the bottom of the piston.      The top always gets the boost or vacuum from the small hose.    

I believe it is just a matter of which way the air flows.    The instructions that come with it say to re-orient the valve to prolong the life of the diagram.    It seemed strange to me... but I think now that it can work either way.   
  ----- Original Message ----- 
  From: djdawson2 at aol.com 
  To: clancybill at yahoo.com ; fastscirocco_2000 at yahoo.com ; da5150_2000 at yahoo.com ; s-car-list at audifans.com 
  Sent: Tuesday, August 09, 2005 9:32 PM
  Subject: Re: [s-cars] blow off valve orientation... was Re: Fluttering Sound from Turbo?


  Yikes... not me.  Installing the bypass valve with boost hitting the bottom of the piston (or diaphragm) is a huge strain on the BPV.  I can't imagine it would be able to remain closed either.  Keep in mind that the BPV is only getting boost through a 4mm hose connected to the IM.  OTOH, the bottom of the BPV is seeing full boost from a 3/4" hose that is seeing pre-IC pressures (higher than the IM pressures).  Sounds unfair to me.

  Also, I would bet heavily on the original poster's problem as being a failed BPV.
  FWIW,
  Dave
   
  -----Original Message-----
  From: Bill Clancy <clancybill at yahoo.com>
  To: chris chambers <fastscirocco_2000 at yahoo.com>; David Greaves <da5150_2000 at yahoo.com>; Scar <s-car-list at audifans.com>
  Sent: Tue, 9 Aug 2005 19:55:16 -0700
  Subject: [s-cars] blow off valve orientation... was Re: Fluttering Sound from Turbo?


Speaking of backwards....

I installed a new polished forge 007 diverter valve from ECS tuning.   The 
instructions that come with it suggest installing it the other way...or 
"backwards."

-- "When installing this valve we would suggest that the side pipe is 
installed at the return to the turbocharger intake....This revised method of 
fitment will prolong the life of the diaphragm." --

It kinda makes a high pitched whoosh sound when it opens (as I let off the 
throttle).   At least I can hear it working....
I was wondering if anyone else has used this valve...and how it has been 
installed?


----- Original Message ----- 
From: "chris chambers" <fastscirocco_2000 at yahoo.com>
To: "David Greaves" <da5150_2000 at yahoo.com>; "Scar" 
<s-car-list at audifans.com>
Sent: Tuesday, August 09, 2005 7:43 PM
Subject: Re: [s-cars] Fluttering Sound from Turbo?


> Sounds like either the Blow off valve to me.
>
> Check and make sure it's not in backwards
>
>
> --- David Greaves <da5150_2000 at yahoo.com> wrote:
>
>>
>>
>> Would love to get some advice regarding a sound I am
>> hearing (I think anyway) from the turbo on my 94 S4.
>>
>> When ever I run the rpms up to say, 4 or 5 thousand
>> under at least moderate throttle, when I back off to
>> shift to next gear, the turbo seems to be making a
>> fluttering sound as it comes down in rpms in between
>> the shift.  It does not seem to have lost any power,
>> however, the sound makes me wonder if I have a
>> precursor to later problems.............
>>
>> Thanks!
>>
>>
>>
>>
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