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Animation of new Cummins M2 two-stage turbo in Nissan Titan XD 5L V8 diesel

The Cummins 5.0L V8 Turbo Diesel which makes its debut in the upcoming 2016 Nissan Titan XD full-size pickup truck (earlier post) features a unique Cummins M² Two-Stage Turbocharger and is configured to work well at both low and high engine speeds.

The series sequential turbocharging system, involving two differently sized turbochargers, effectively provides a small turbocharger for low air flow requirements and a large turbo for high air flow. The small turbo delivers good transient response due to its low inertia, while the large turbo maintains power at higher engine speeds. This helps eliminates turbo lag, providing a continuous delivery of peak torque through the RPM range.

In order to control the air flow between the two turbochargers, the new M² system from Cummins Turbo Technologies uses a patented rotary valve to open ports that perform the bypass or waste-gate functionality and provide exhaust after-treatment thermal management.


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