New Holland SmartTrax T8.320 Service Manual page 47

Electronically Variable Geometry Turbocharger (eVGT)
RAIL15TR00383BA
RAIL15TR00395BA
Vanes open (low boost)
The eVGT uses a series of aerodynamic vanes to direct exhaust toward the turbine controlling both the velocity and
angle the exhaust contacts the turbine. This gives the ECU the ability to dynamically "tune" the boost pressure at any
given engine speed and load, Improving performance and fuel economy.
Fully open the velocity slows and the angle is decreased therefore the turbine and compressor turn slower producing
less boost. When needed, the vanes close increasing the velocity and angle, therefore increasing turbine and com-
pressor speed, producing higher boost anytime it is needed across the entire operating range of the engine.
Engine - Engine and crankcase
The electronically Variable Geometry Turbocharger
(eVGT) is used on the TIER 4A T8.420 and TIER 4B
T8.350, T8.380, T8.410 and T8.435. The eVGT is
electronically controlled by the Engine Control Unit
(ECU).
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RAIL15TR00394BA
Vanes closed (high boost)