History and Examples of Use
One of the first production cars to use these turbos was the limited-production 1989 Shelby CSX-VNT, equipped with a 2.2-Liter Chrysler K engine . The Shelby CSX-VNT utilised a turbo from Garrett, called the VNT-25 because it used the same compressor and shaft as the more common Garrett T-25. This type of turbine is called a Variable-Nozzle Turbine (VNT). Turbocharger manufacturer Aerocharger uses the term 'Variable-Area Turbine Nozzle' (VATN) to describe this type of turbine nozzle. Other common terms include Variable-Turbine Geometry (VTG), Variable-Geometry Turbo (VGT) and Variable-Vane Turbine (VVT). In Japan, the 1989 Honda Legend used a variable geometry turbo with an integrated water cooled intercooler installed on its 2.0 L V6 engine, and was only manufactured for one year.
In 1991, Fiat changed VGT turbocharger (Honeywell VNT) to Croma's direct-injected turbodiesel.
The Peugeot 405 T16, launched in 1992, used a Garrett VAT25 variable-geometry turbocharger on its 2.0-liter 16-valve turbocharged engine.
The 2007 Porsche 911 Turbo has twin VNT turbochargers on its 3.6-liter horizontally-opposed six cylinder gasoline engine. VGTs have been used on advanced turbo diesel engines for many years, primarily to compensate for performance loss when the engine is equipped with an EGR.
Read more about this topic: Variable-geometry Turbocharger
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