[urq] Upper Wastegate Hose on '83 Ur Quattro

[Bill Bennett]

Justin, the same port on my no longer hot to touch suction hood aka "igloo" on my WX meanderers off to my evaporative system, I really can not see any effect on the waste gate by that port being hosed to the suction hood, it would just be airflow, the vacuum level would be negligible(airfilter restriction), same as venting it to atmosphere. no vacuum available there Justin. Bill
  ----- Original Message ----- 
  From: Justin 
  To: urq at audifans.com 
  Sent: Tuesday, May 04, 2004 7:58 PM
  Subject: Re: [urq] Upper Wastegate Hose on '83 Ur Quattro


  Just to complete the discussion, here is a pic of a WR engine with a vacuum
  hose clearly going to the wastgate port from the Igloo...
  (middle pic...)
  http://www.geocities.com/MotorCity/Speedway/6172/pictures.html
  Justin
  ----- Original Message -----
  From: "Charles Baer" <charlie at istari.com>
  To: <>
  Sent: Tuesday, May 04, 2004 9:11 PM
  Subject: Re: [urq] Upper Wastegate Hose on '83 Ur Quattro


  > There better not be any flow out of that port, unless you have a torn
  > diaphragm.  When the wastegate opens, it is letting engine exhaust bypass
  > the turbine.
  >
  > I concur with the senator from Kaleefohnia, the top port is for a
  reference
  > pressure to balance against the IM pressure.  Feeding pressure into the
  top
  > port with a schrappnelknobben delays wastegate opening by lowering the
  > pressure differential on the diaphragm when boost increases.  Tapping into
  > the pre-turbo intake tract will increase the boost pressure
  > differential, admittedly
  > by a small amount, and open the wastegate earlier than it would with the
  > port vented to atmosphere.
  >
  > Charlie
  >
  > Justin wrote:
  >
  > >Yeah, I've seen the vacuum diagrams listed on the WX in the following
  > >document on Martin's site: http://www.quattro.ca/Urq/urq-IST-MaintAdj.pdf
  > >As using the Igloo port as a vacuum for the "Evaporative emission control
  > >system"..basically the gas tank venalation...which I don't think the WR's
  > >had... (as far as I know...).
  > >So, connecting the wastgate port to the Igloo should be o.k., since the
  > >vacuum created in the line is small....and would allow air to vent into
  the
  > >intake system once the gate opens....
  > >    I think is just matter of your personal preferece...
  > >
  > >Justin
  > >----- Original Message -----
  > >From: "Buchholz, Steven" <Steven.Buchholz at kla-tencor.com>
  > >To: <urq at audifans.com>
  > >Sent: Tuesday, May 04, 2004 5:01 PM
  > >Subject: RE: [urq] Upper Wastegate Hose on '83 Ur Quattro
  > >
  > >
  > >... I don't see any way that it would make any more sense ... that port
  is
  > >documented as a vent on the WX ... it doesn't need to be connected to
  > >anything ... in fact if you started drawing a vacuum there you would be
  > >working against the WG spring and actually causing the WG to open sooner.
  > >Admittedly there isn't much of a vacuum on the back side of the airflow
  > >sensor plate.  Its been a while since I've looked at the engine in my
  car,
  > >but I know that the line coming off the top of the igloo on the WX is
  > >definitely connected elsewhere ...
  > >
  > >
  > _______________________________________________
  > Audifans urq mailing list
  > Send posts to: mailto:urq at audifans.com
  > Manage your list connection: http://www.audifans.com/mailman/listinfo/urq
  > Have an urq question?  Check the Audifans Knowledgebase!
  > http://www.audi-quattro.org/cgi-bin/twiki/view/Audi/UrQuattro
  > Have an urq answer? ... Please help others by adding to the KB ... all
  contributions welcome!


  _______________________________________________
  Audifans urq mailing list
  Send posts to: mailto:urq at audifans.com
  Manage your list connection: http://www.audifans.com/mailman/listinfo/urq
  Have an urq question?  Check the Audifans Knowledgebase!
  http://www.audi-quattro.org/cgi-bin/twiki/view/Audi/UrQuattro
  Have an urq answer? ... Please help others by adding to the KB ... all contributions welcome!