Holset® Turbochargers and Air Handling

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Cummins is the only manufacturer focused solely on medium- to heavy-duty diesel engine turbo technologies. For more than 60 years, we have delivered innovative, reliable turbocharger solutions for our customers. Our vision for turbocharger solutions, thanks to our rich company heritage derived from our Holset® brand, sets us apart as a technology leader.

Commercial diesel engines require advanced technologies that deliver efficiency and meet strict emissions requirements. Our fixed, wastegate, variable, two-stage, turbo-compounding and waste heat expander technologies were specifically developed to deliver higher efficiency and lower cost.

Today, Cummins Turbo Technologies engineers are actively developing state of the art solutions for the next generation, including assisted turbocharging, new bearing systems and enhanced compressor stage performance.

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Fixed Geometry Turbochargers

The Holset® brand has its roots in fixed geometry technology, turbochargers which funnel all the exhaust gas to the turbine to boost engine power. With over 60 years experience of meeting customer power requirements, Cummins Turbo Technologies’ expertise is tried and tested, and produces some of the world’s most optimized, efficient and reliable turbochargers.

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Variable Geometry Turbochargers

The Holset® VGT™ from Cummins Turbo Technologies pioneered Variable Geometry (VG) technology for the commercial vehicle market in 1998. Featuring a patented sliding nozzle ring, the Holset® VGT™ offers a wide flow range that allows for higher boost pressures at low engine speeds. VG technology provides the most fuel-efficient means of driving short-route Exhaust Gas Recirculation (EGR), which is used to reduce NOx levels.

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Wastegate Turbochargers

Wastegate technology helps to prevent turbocharger over-speeding, as well as engine overboost. The well-engineered Holset® wastegate turbochargers employ the same industry-leading design techniques used throughout Cummins. Wastegate turbochargers improve upon fixed geometry units with an overall 3% increase in efficiency, and they can be optimized for various aftertreatment systems.

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Cummins Turbo Technologies News

Stay up to speed on the latest turbocharger technology by signing up for the Cummins Turbo Technologies quarterly newsletter.

How a turbocharger works video still

How a turbocharger works

 

This short video featuring the Cummins Turbo Technologies HE400VG provides an animated overview of how a turbocharger works.

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Still image of turbocharger from video

Meet the new 7th generation series 400 variable geometry turbocharger

Launched in 2021, the 400 series VGT offers 5% higher turbocharger efficiency compared to its predecessor. The leapfrog innovation is the combined effect of a multi-clearance shroud design and new wheel options to provide higher turbine efficiency. The latest HE 400 VGT will help engine manufacturers meet upcoming emission standards and offer best in class fuel economy.

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Turbocharger features

labelled turbocharger


  1. Turbine wheel
  2. Turbine housing
  3. Exhaust gas inlet
  4. Exhaust gas outlet
  5. Compressor wheel
  6. Compressor housing
  7. Bearing system
  8. Compressed air outlet

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