[Vwdiesel] 01 Golf TDi TURBO issues

[LBaird119 at aol.com]

In a message dated 7/5/2010 7:43:42 PM Pacific Daylight Time, rbp at 4u2bu.org 
writes:

> by definition, since the turbo comes from the exhaust, and the exhaust 
> comes from the intake, and the intake comes from pistons drawing down and 
> sucking air in, due at least to friction losses, wouldn't turbo pressure 
> inherently be lower than intake vacuum?
> 

  Uh, no...
  By "definition" a turbocharger is a turbine, that supercharges the 
air going into the intake.
  Exhaust goes through a turbine which is connected, via a common 
shaft, to an air compressor.  That compressor produces MUCH more 
volume than the engine requires, in order to make PRESSURE.  Otherwise 
it'd do nothing or be a restriction.  Pistons sucking air in is moot to 
irrelevant while under boost since the intake charge is now under 
pressure.  That gives even more air, to which even more fuel can go 
into and make even more exhaust to turn the turbo even faster.
  It runs from the exhaust end, not the intake.  No way you possibly 
sucked enough dirt/sand into the engine to damage the turbine 
without trashing the engine that was in its path.  Besides, you simply 
didn't ingest that much dirt anyway.  
  When the working theory doesn't work you need to discard it in 
order to come up with one that DOES work so you can find the 
problem.  
     Loren