New Seventh-Generation Turbo From CTT

17 March 2021

Cummins Turbo Technologies (CTT) announced it is launching its seventh-generation 400 series variable geometry turbocharger (VGT) designed to help engine manufacturers meet upcoming emission standards and provide improved fuel economy.

The new series 400 variable geometry turbocharger from Cummins Turbo Technologies.

Originally revealed at IAA in Hannover in 2018, the new 400 series VGT is being launched with major customers in Europe and North America in the first quarter of 2021.

Though the latest product line is focused on the on-highway heavy-duty market with engines ranging from 10 to 15 L displacement, it can also be applied to smaller engines in the medium-duty space. It is suitable, CTT said, for variety of applications, including line haul, vocational, transit bus and firetruck.

The next generation 400 series VGT has 5% higher turbocharger efficiency compared to its predecessor, the company said. “The leapfrog innovation is the combined effect of a multi-clearance shroud design (patent pending) and new wheel options to provide higher turbine efficiency,” said Lisa Prentiss, director – Heavy Duty Engineering. The multi-clearance shroud provides significant performance gains - specifically at lower flows and adds value through improved engine down speeding and better fuel economy, CTT said.

Along with the performance enhancements, the turbocharger durability has been improved using an optimized variable geometry mechanism (nozzle ring, shroud plate) and center housing designs.

The new design has undergone more than 7000 hours of rigorous testing, the company said and CTT has collaborated with customers to optimize performance and fuel economy.


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