![The Cummins Tier 4 Final QSB4.5 features Cummins Variable Geometry Turbocharger (VGT) for higher ratings and performance levels previously associated with 6-cylinder engines. For lower ratings - down to 121 hp - VGT technology improves transient response on a fuel-efficient basis.](https://img.forconstructionpros.com/files/base/acbm/fcp/image/2013/02/cummins-qsb45-engine_10862454.png?auto=format%2Ccompress&fit=crop&h=288&q=70&w=512)
The Cummins Tier 4 Final QSB4.5 features Cummins Variable Geometry Turbocharger (VGT) for higher ratings and performance levels previously associated with 6-cylinder engines. For lower ratings - down to 121 hp - VGT technology improves transient response on a fuel-efficient basis.
![03f34697](https://img.forconstructionpros.com/files/base/acbm/fcp/image/2024/05/03f34697.png?auto=format%2Ccompress&q=70&w=250)
The Cummins Tier 4 Final QSB4.5 features Cummins Variable Geometry Turbocharger (VGT) for higher ratings and performance levels previously associated with 6-cylinder engines. For lower ratings - down to 121 hp - VGT technology improves transient response on a fuel-efficient basis.
- 173-hp, 4-cylinder, single turbocharger, 4.5-liter engine
- VGT features one-piece sliding nozzle to precisely adjust airflow delivered to engine
- Rapid boost provided at low engine rpm; high boost maintained at higher rpm
- Rear gear train for stiffness and lower gear noise
- High Pressure Common Rail fuel system and Electronic Control Module (ECM)
- Cooled Exhaust Gas Recirculation and Cummins Compact Catalyst aftertreatment plus Selective Catalytic Reduction
- Peak torque: 520 lb.-ft.
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