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Two-Stage Parallel Turbos for Diesel Engines

In our Two-Stage parallel systems, two turbos work in sequence, delivering significant gains in power and torque in engines typically 2.0L or bigger.


Balancing power & efficiency at every speed

Our Two-Stage parallel turbo for diesel engines was an industry first when we released it in 2006. Since then, it’s increasingly in-demand among auto manufacturers seeking enhanced performance, fuel efficiency, and emissions control. Our Two-Stage parallel turbos for diesel engines are available for engines with as much as 2.0L of displacement.

Two-Stage Parallel Turbos for Diesel Engines Benefits

Our Two-Stage parallel turbo for diesel engines offers superior performance within a compact design. Benefits include:

Improved vehicle acceleration, torque and power

compared with equivalent
diesel engines

Superior transient behavior

produces a longer
gear ratio strategy

Reduced fuel consumption

and raw emissions

Lowered a fter-treatment complexity and cost

Low thermal inertia

produces same catalyst light-off
speed as single turbos

Two-Stage Parallel Turbochargers for Diesel Engines
Key Features

In our Two-Stage parallel system, two turbos work in sequence to improve engine performance. Our high-temperature, high-durability turbine control valve is designed to ensure rapid transition between the different modes of turbo operation.

From ignition to 2400 rpm:

  • The primary turbo activates (vanes vary from fully closed to almost fully open)
  • The turbine valve and the compressor discharge valve remain closed
  • The compressor recirculation valve stays open

From 2400 rpm to 2800 rpm:

  • The secondary turbo activates (vanes close slightly during transition, then open again)
  • The turbine valve begins to open
  • The compressor discharge valve opens

Beyond 2800 rpm:

  • Both turbos are in full sequential mode (vanes are fully open)
  • The turbine valve stays open
  • The compressor discharge valve is open

Ultra-Efficient Clean Diesel Platforms Can Benefit Greatly from Garrett’s Downsized, High-Temperature VNT Boosting Technology

Garrett’s sixth generation variable geometry turbo architecture (VNT) is helping auto manufacturers harness the performance potential of higher temperature diesel powertrains.

read more

Two-Stage Parallel Turbos for Diesel Engine and Connected Vehicle Solutions

Garrett’s Two-Stage parallel turbo for diesel engines helps engines improve their performance and efficiency. Our connected automobiles and integrated electronic boosting products continue this trend by offering intelligent solutions for today’s vehicles. These include cybersecurity protections, electric turbos, and electric compressors, advanced powertrain controls, OEM Diagnostic Prognostic Solutions, and more.

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