2015 Ford 6.7L Diesel Gets Power Upgrades
Bigger turbo and other mods take “2nd Gen” Power Stroke to new performance level
When the 2015 Super Duties roll out there’ll be a lot of heads turning in the work truck world where towing power and torque rule the day.
Ford’s 6.7L Power Stroke engineers have yet to release the numbers, but say ““We’ve dramatically improved performance while reducing overall engine complexity by focusing on the turbo system.”
At the heart of the new found power is the use of 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 lb.-ft. of torque.
In addition, the larger turbo drove improvements to the fuel delivery system, specifically a new high-pressure fuel pump and fuel injectors.
The GT37 features a single, larger 88-millimeter 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 to 72.5 millimeters from 64 millimeters, so exhaust gases have a larger surface area to spin the turbo, providing extra power.
Another change: The wastegate and the wastegate controls are eliminated, because the turbo operates at lower peak pressures than the GT32, and Ford has upgraded the transmission and torque converter to handle the added power.
“The original designers of the current Power Stroke V8 diesel forecasted needs for higher output. This facilitated the larger turbocharger, increasing airflow and creating more power,” said David Ives, Power Stroke technical specialist.
A further benefit of the 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.
Even though the fuel system delivers extra fuel as needed to provide more power, other efficiency improvements ensure 2015 Ford F-Series Super Duty pickup customers see similar performance to today’s best-in-class fuel economy.