VNT technology is also a key enabler of engine downsizing, an industry-wide trend to create smaller, more fuel-efficient and lower-emitting powertrains that match or exceed the performance of their larger counterparts and enhanced braking capability.Īlthough launched 20 years ago on the 1.9L Fiat Croma, it was in 1995 that VNT, with a new vane design and improved aerodynamics, really came of age when matched to VW-Audi’s 1.9-liter direct injection diesel engine. Lower emissions are made possible by Exhaust Gas Recirculation facilitated by the turbo. VNT turbos contribute to higher torque levels, particularly at low engine speed, and help deliver more power across a wider range, better acceleration through improved transient response and cleaner combustion. This new platform delivered many innovations – a new cartridge design, new cambered vanes, a new generation turbine wheel, improved aerodynamics and better controllability. The key advance was the ground-breaking way that the variable mechanisms were attached onto the bearing housing through an elastic shroud. The current Garrett Variable Geometry (VNT) turbos are upgraded versions of the third generation VNT launched in 2004. At higher engine speeds, the moveable vanes open to maximize the exhaust gas flow, thereby avoiding turbo over-speed and maintaining the boost pressure required by the engine. At low engine speed, the variable nozzle turbine vanes close to restrict the exhaust air flow through the turbine, thereby increasing turbine power and boost pressure. In a VNT turbo, the exhaust flow through the turbine wheel is controlled by a row of vanes that move to match the exact boost requirements of the engine. While the majority of VNT applications are in the 1.4L to 2.0L range, the architecture is also heavily specified in the premium 3.0L V6 diesel segment. Variable Geometry Turbo (VNT) technology, in a mono-turbo set-up, is ideally suited for diesel engines from 0.9L to 3.0L. ![]() The latest generation VNT delivers benchmark transient response, low-speed efficiency, reliability, weight savings and packaging flexibility. With over 50 million units in the field, Garrett Variable Geometry Turbo (VNT™) is a key variable geometry turbo technology for auto manufacturers as they seek to enhance light vehicle driveability, improve fuel efficiency and reduce emissions. Advanced Controls and System Optimization.48V Electric Compressor for Mild Hybrid Vehicles.
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