25-08-2014, 01:43 PM
The DW12ATED4 as in the 406/807/406 coupe etc is a GT1549P - it's a Variable Geometry turbo... Not Variable Nozzle - it's the same system as they use in larger frame VGT Holset turbochargers.
Essentially slides a set of Nozzles into the flow of the turbo to restrict the flow and increase gas velocity:
![[Image: Garrett_GT1549P.jpg]](http://i01.i.aliimg.com/photo/v0/105968797/Garrett_GT1549P.jpg)
Looks like this inside:
![[Image: 464657085_234.jpg]](http://i00.i.aliimg.com/img/pb/085/657/464/464657085_234.jpg)
Notice nozzles aren't adjustable in their attitude, only adjustable moving it further outward to stop the gas being accelerated into the turbine wheel.
Essentially slides a set of Nozzles into the flow of the turbo to restrict the flow and increase gas velocity:
![[Image: Garrett_GT1549P.jpg]](http://i01.i.aliimg.com/photo/v0/105968797/Garrett_GT1549P.jpg)
Looks like this inside:
![[Image: 464657085_234.jpg]](http://i00.i.aliimg.com/img/pb/085/657/464/464657085_234.jpg)
Notice nozzles aren't adjustable in their attitude, only adjustable moving it further outward to stop the gas being accelerated into the turbine wheel.