LR3/Disco 3
Turbocharger
The variable vane turbocharger, fitted to the LH exhaust manifold of the TdV6 engine, makes it possible to vary the
exhaust gas flow of the turbine, dependent on engine operation. This improves the power transfer to the turbine wheel
and compressor, particularly at low engine speeds, thus increasing the boost pressure. The guide vanes are opened
progressively as the engine speed increases so that the power transfer always remains in balance with the required
charger speed and the required boost pressure level. Variable vanes facilitate better use of the exhaust gas energy so as
to further improve the efficiency of the turbocharger and thus of the engine, compared to the more conventional
'wastegate control'.
Advantages:
High torque at both high and low engine speeds
Continuous and optimum adjustment for all engine speeds
No wastegate valve required, exhaust energy is better utilised, less back-pressure in conjunction with same
compressor work
Low thermal and mechanical load improves engine power output
Low emissions
Optimised fuel consumption over the entire engine speed range
The turbochargers construction is similar to the unit fitted to the Freelander Td4 engine. However, a stepper motor instead
of a vacuum diaphragm electronically controls the variable vanes.
The DC rotary actuator motor operates a drive shaft. The drive shaft is connected to the vanes by an actuating lever.
Adjustment of the vanes is achieved by moving the actuating lever. When the drive shaft is turned, a signal is created at
Published : May 6, 2004
Item Part Number
Description
1
-
Oil feed pipe
2
-
LH exhaust manifold
3
-
Actuator motor
4
-
Actuator lever
5
-
Oil return pipe
6
-
Turbocharger
