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

[Djdawson2 at aol.com]

In a message dated 1/11/2006 6:42:23 PM Mountain Standard Time,  
tmullane at gmail.com writes:

Teddy is  correct.  Unplugged, or without voltage from the ECU, the
WGFV allows  boost through to the WG, opening it.
 
I agree, and stated that in my response to Teddy.  Yep, default  mode... if 
something isn't working right, the ECU (and the mechanical design)  default to 
a setup that allows very little boost. 
 

When voltage is applied, the valve opens the third port, allowing boost to  
both the WG and into the intake boot.  This bleeds enough pressure off so  that 
the
WG does not open.



So, are you suggesting that "bleeding off pressure" is the only way the WG  
remains shut?  If that is the case, you're suggesting that the WG spring,  and 
only the spring, is responsible for holding the WG shut.  That being  the 
case, how would you explain the fact that we are capable of running higher  boost 
levels than the spring alone (no WGFV or ECU input allowed) can  maintain?
 
Yeah, Mark is right... this has been beaten to death.  But I'm not  quite 
sure how anyone makes the logical leap between a WG spring that will only  allow 
14 or so psi by itself... and the fact that we can run double that with  the 
WGFV functioning as designed.
 
The ONLY way the spring can be assisted, from the bottom of the WG  diaphragm 
to allow more boost than the spring alone, is by introducing a  vacuum.  That 
is simple fact.
 
Dave (and I'm smiling about this age old topic)