[Vwdiesel] Grant opportunity

[Libbybapa at wmconnect.com]

In a message dated 4/20/06 6:50:21 AM US Mountain Standard Time, 
stephensrw at stn.net writes:


> Don't you love the modern practise of writing obscure or made up acronyms
> assuming others know them or can read your mind?
> 

Sure, it gives me an opportunity to Google away my curiousity.  I don't 
assuem that others can read my mind, but understand how easy it is to find out what 
an ac ronym stands for.  BTW what does VW stand for?  AFAIK it Very Weird.  
VNT is an accronym for Variable Nozzle Turbine.  A similar acronym meaning 
functionally the same thing would be VGT Variable Geometry Turbine.  A VNT has a 
series of vanes radiating around the turbine.  Those vanes are all attached to 
a gear that allows their angle to be adjusted to direct the air either 
agressively at the turbine or free flowing.  They are un-wastegated and boost control 
is achieved solely by the angle of the vanes in relation to the turbine.  
There are two significant benefits over regular turbos.  Due to the unwastegated 
situation all of the exhaust gases pass through the turbine and so they are 
more efficient as far as exhaust heat recovery.  Due to the ability to adjust 
the vane angle the turbo lag is virtually eliminated with maximum boost occuring 
in the very low rpm ranges, yet also they can be more free-flowing than very 
large turbos as well in the upper rpms.  The downside to retrofitting them to 
older engines is the vane control system as it is not merely boost dependent.  

Andrew