We already knew the next generation Nissan Titan, due to be revealed at the 2015 Detroit motor show, was going to get Cummins V8 diesel power. A previous report announced the availability of the 5.0-liter unit, though that’s where details about it stopped.
It’s expected to make 300-ish horsepower, as well as 500 lb-ft (677 Nm) of torque. There’s nothing out of the ordinary in these numbers, but what’s cool is how it’s going to make that power.
The engine will feature a sequential twin-turbo system called Holset M2 Two-Stage System that also uses Rotary Turbine Control. The name Holset comes from a UK-based company purchased by Cummins in 1973, but in spite of its name changing to Cummins Turbo Technologies in 2006, the old one was kept too.
Car&Driver says that, in fact, we shouldn’t call it a twin-turbo setup, because of the two turbos noticeable size difference. As is the case with similar such systems, the smaller unit spools up quicker, providing boost at low rpms, while the larger one starts spinning a bit later and helps with the power bit of the torque curve.
The second part of the system, Rotary Turbine Control, features “a single electrically controlled rotary valve that directs the exhaust flow to either of the two turbochargers or a wastegate depending on the engine load and rpm.” This means the valve can “also act as a throttle in the exhaust stream, raising the back pressure to act as an exhaust brake when the driver lifts off the accelerator.”
It basically promises a smooth transition from either source of boost, as well as allowing for the hot exhaust gases to clear the vehicle’s particulate filter of soot.
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