When Ford introduced their 2015 F-Series Super Duty lineup, one of the most important features was the second-generation 6.7-liter Power Stroke V8 turbo diesel engine. Since the 6.7-liter Power Stroke diesel debuted in 2010, Ford engineers have continued to examine each component of the engine to develop improved performance.
A key innovation on the original 6.7-liter power stroke diesel was its reverse-flow layout. This design places the exhaust inside the engine’s V-shape while the air intake is positioned on the outside of the V, naturally improving performance attributes including:
- Shorter airflow from the exhaust system to the turbocharger sitting between the engine’s cylinder banks improves turbo responsiveness – key to providing torque quickly when it’s needed most;
- Positioning the turbo inside the engine’s “valley” helps isolate the engine’s hottest temperatures, improving performance and efficiency while also reducing noise, vibration, and harshness.
Ford built on this design as they upgraded the power stroke for 2015. One improvement is a larger GT37 turbocharger that replaces the previous GT32 model, enabling more airflow to the engine to produce more power beyond today’s 400 horsepower and 800 pound-feet of torque.
The GT37 turbo features a single, larger compressor wheel that replaces the GT32’s dual-sided compressor design. The compressor forces air into the engine’s cylinders to improve performance – especially at high altitude where the air is thinner than at sea level. The turbine size is increased, so exhaust gases have a larger surface area to spin the turbo, providing extra power. The wastegate and the wastegate controls are eliminated, because the new turbo operates at lower peak pressures.
A further benefit of Ford’s larger turbo is improved engine exhaust braking, manually controlled by a push-button switch on the dashboard. Extra braking power helps reduce wear and tear on wheel brakes and requires less manual brake application from the driver, especially on downhill grades.
Ford’s turbo changes also drove improvements to the fuel delivery system, specifically a new high-pressure fuel pump and fuel injectors. The pump’s cam stroke is increased to deliver more fuel when desired for increased power. All-new injector tips better atomize the fuel, resulting in improved combustion that enables lower noise, vibration, and harshness. Other benefits include cleaner emissions and a reduction in the buildup of fuel deposits on the valves over time.
A new exhaust temperature sensor enables more accurate fuel control, which improves both durability and drive-ability, especially when towing.
, Fuel Economy