[s-cars] While we are on the subject of WGFVs...

[Paul Gailus]

It's interesting to note that the WGFV tap on the OEM
turbo intake hose is very close to the compressor inlet.
This area will have the lowest static pressure of any place
in the air intake system when there is significant air flow.

I won't say any more about the "sonic nozzle" except
to say that it sure did draw a lot of attention to what is
basically a restriction orifice.

Paul

  ----- Original Message ----- 
  From: djdawson2 at aol.com 
  To: gailus at mindspring.com ; s-car-list at audifans.com 
  Sent: Friday, January 13, 2006 10:29 AM
  Subject: Re: [s-cars] While we are on the subject of WGFVs...


  So... to make a long story short... there IS a vacuum present at the turbo inlet.  This is the point at which I quit the last time we had this thread.  No one would buy into a vacuum in that area... and I threw in the towel.  Paul "Sonic Nozzle" Gailus has provided the explanation.

  And he still hasn't told us if he was just messing with us the other night with his dissertation on the Audi sonic nozzle...

  Dave 
   
  -----Original Message-----
  From: Paul Gailus <gailus at mindspring.com>
  To: s-car-list at audifans.com
  Sent: Fri, 13 Jan 2006 10:47:56 -0500 (EST)
  Subject: Re: [s-cars] While we are on the subject of WGFVs...


In order to get any airflow from the external atmosphere into
the compressor inlet, the static pressure at the inlet has to be lower
than the ambient atmospheric pressure.
The only way you can get air flow into the compressor inlet without
having a static pressure there less than atmospheric would be to
have an external source of dynamic pressure supplying high velocity
air (i.e., another blower).