Anticipation is growing over the new 2016 Nissan Titan XD and its all-new 5.0-liter Cummins V-8 turbodiesel. Now with the official debut at the North American International Auto Show behind it, Nissan is slowly diving into the details of what makes the truck tick. In this case, the info swirls around the innovative turbocharging system bolted to the Cummins V-8.

The animation above shows just how the airflow moves through the two-stage turbo using a patented, Holset rotary valve that controls airflow through the system. Basically the turbo uses an extra set of turbines on both the exhaust and intake sides that increase pressure, getting boost flowing to the engine at lower engine speeds. Conversely, both the exhaust and intake sides have larger, low-pressure chambers that move vast amounts of air during higher engine speeds. The larger chambers act as the main boost-generating turbines.

During low-rpm acceleration, the smaller turbines spool up quickly, providing boost while the larger turbines take over during more aggressive throttle applications. This contributes to the 5.0-liter’s impressive 310 horsepower and 555 pound-feet of torque ratings. Nissan promises the truck will have staggering towing and hauling capabilities, likely making the Titan XD the most capable half-ton truck on the market.

The turbo system includes four separate modes. They are: high-pressure turbo mode, low-pressure turbo mode, wastegate turbo mode, and regen turbo mode. Within the entire assembly, two active valve systems work to control the airflow. On the intake side, a compressor bypass valve routes air either through or around the high-pressure turbine, while the exhaust side uses the patented valve Cummins calls the “Rotary Turbine Control” valve. As its name suggests, the valve is shaped like a cylinder and rotates. The valve directs air into either the high-pressure or low-pressure turbines.

Simply put, the system works to eliminate lag associated with larger turbos while still providing the grunt that big-bore turbochargers are known for.

Click past the jump for more details on the turbo system.

Breakdown: The Four Turbo Modes

1. High-Pressure Turbo Mode

Minimizes turbo lag and enables better vehicle performance. RTC valve open to HP turbine; Compressor bypass valve closed.

  • Exhaust side: Air flows into the high-pressure turbine, then into the low-pressure turbine.
  • Intake side: Fresh air flows from low-pressure compressor into high-pressure compressor, then into the engine.

2. Low-Pressure Turbo Mode

Enables higher-power performance. RTC valve open to both LP and HP turbines; Compressor bypass valve open.

  • Exhaust side: Air flows into both low- and high-pressure turbines.
  • Intake side: Fresh air from low-pressure compressor mostly bypasses the high-pressure compressor, then flows into the engine.

3. Wastegate Turbo Mode

Maximizes power. RTC in wastegate position; Compressor bypass valve open.

  • Exhaust side: Majority of air bypasses both low- and high-pressure turbines and flows into exhaust outlet.
  • Intake side: Fresh air from low-pressure compressor mostly bypasses the high-pressure compressor, then flows into the engine.

4. Regen Turbo Mode

Optimized for After Treatment operation for emissions control. RTC valve closed; Compressor bypass valve closed.

  • Exhaust side: Very little air flows into both low- and high-pressure turbines.
  • Intake side: Very little air enters into both low- and high-pressure compressors.

Why it Matters

This turbocharging technology creates a powerful, yet clean and efficient diesel engine that produces gobs of torque. Cummins is one of the most respected diesel engine builders, and has a long history of offering robust engines for medium and heavy-duty trucks. Now with Nissan taking advantage of this powertrain, expect the Titan XD to earn its due respect from the consumer diesel crowd.

Nissan Titan XD

2016 Nissan Titan XD - image 610100

The all-new Titan is due out for 2016, and Nissan will offer the XD series, which is a sort of half-step between the half-ton and three-quarter ton truck segments. A fully boxed, high-strength steel frame provides the backbone of the truck. The Titan XD’s towing capacity is expected to exceed 12,000 pounds with a bed-mounted gooseneck hitch, positioning the truck in a highly competitive spot against Ford, Chevy, Ram, and Toyota.

The truck will hit dealers in late 2015.

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Press Release

When the covers were pulled off the 2016 Nissan TITAN XD full-size pickup at the 2015 North American International Auto Show in January, it was really two debuts in one with the all-new Cummins 5.0L V8 Turbo Diesel engine being shown for the first time too.

Deep Dive: Nissan Titan XD's Cummins Turbocharger - image 613850

The Cummins 5.0L V8 Turbo Diesel in the upcoming 2016 Nissan TITAN XD features a unique Cummins M²™ Two-Stage Turbocharger that 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 provides the advantage of good transient response due to its low inertia and 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.

Deep Dive: Nissan Titan XD's Cummins Turbocharger - image 613851

"We are excited to have Cummins as a partner to launch the new TITAN XD. The Indiana-made Cummins 5.0L V8 is a perfect fit for our truck that was designed in California, engineered in Detroit, and will be assembled in Mississippi," said Rich Miller, chief product specialist, TITAN, Nissan North America, Inc. "The 2016 TITAN reflects the passion that both Nissan and Cummins employees have toward their heritage as truck people. We collectively know what we would want in our own truck and pulled together all of those traits into one unbeatable package that we are thrilled to finally show the world."

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