[s-cars] Crank Case Pressure and Turbo Smoke?

[Djdawson2 at aol.com]

In a message dated 2/22/2005 9:05:48 AM Mountain Standard Time, 
strangconst at rogers.com writes:

> 
> Me thinks me is gonna have to disagree with you on the vacuum in the maf to 
> turbo hose.
>   
> If you have a big vacuum there you have trouble.
>  What are the restrictors to the air that would create a vacuum.
>  No throttle plates, no small diameter hoses, just the MAF and it's screens( 
> if still present)
>  The AutoSpeed article should back me up on this.
> 

You can disagree if you like, but you'll be wrong.  Proof is in the 
wastegate.  Assuming you're running a stock WG spring, try clamping the hose going to 
the bottom of the WG.  Go drive your car, and observe your max boost level.  
Lower than it used to be, correct?  The only thing that holds your wastegate 
shut beyond spring pressure is vacuum.  That vacuum comes directly from the MAF 
to turbo hose, and is uninterrupted by the WGFV, until the computer starts to 
allow flow from the turbo scroll (boost) which then regulates your boost 
pressure.

Trust me, this is the way it works.
HTH,
Dave in CO