ISLE Semi Truck Diesel Generator Turbocharger EURO 3 Holset Hx40w 4045570

HX40W Turbocharger 4045570 For Cummins EURO 3 Truck With ISLE Diesel Engine
Variable Geometry Turbocharger (VGT)
Perhaps one of the most exceptional forms of turbocharging, VGTs are limited in production (though fairly common in diesel engines) as a result of cost and exotic material requirements. Internal vanes within the turbocharger alter the area-to-radius (A/R) ratio to match the RPM. At low RPM, a low A/R ratio is used to increase exhaust gas velocity and quickly spool up the turbocharger. As the revs climb, the A/R ratio increases to allow for increased airflow. The result is low turbo lag, a low boost threshold, and a wide and smooth torque band.
Advantages
Wide, flat torque curve. Effective turbocharging at a very wide RPM range.
Requires just a single turbo, simplifying a sequential turbo setup into something more compact.
Disadvantages
Typically only used in diesel appliions where exhaust gases are lower so the vanes will not be damaged by heat.
For gasoline appliions, cost typically keeps them out as exotic metals have to be used in order to maintain reliability.

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