View Single Post
jsveb jsveb is offline
Registered User
 
jsveb's Avatar
 
Join Date: May 2007
Location: Norseman territory
Posts: 2,796
Garage
Question 2:
I believe the WUR and the AAV both have something to do with how the car behaves on a cold start up. The wur initially adjust pressure (preset) to cold control pressure, CCP, the specs for this, you can find in the manual, it varies with temperature.
I believe your 79 does have the windings in the wur. As soon as the wur receives power it starts heating up, hence changing pressure from ccp to wcp. I beleve the wcp should be around 3.65 bar. This change reduces the amount of fuel, it leans it out. So the engine is indeed given more fuel on start up.

For air, depending on ambient temperature, the aav bypasses the butterfly in the throttle. Hence allowing more air, enabling a higher idle when cold. The aav should then close, as it does also have power to it and closes the little funky moon shaped hole.

So it is a combination of more air an fuel on start up.
__________________
Jesper
Carrera 3.0 1975
930 1978 OEM Matte Schwartz, ANDIAL IC, BL WUR, SC cams. LMA-3 w. XD-16 and CP transducer
www.stauningwhisky.dk

Last edited by jsveb; 04-05-2013 at 07:38 AM..
Old 04-05-2013, 07:36 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)