Sirius Satellite Radio Super Duty F-450 - Manual (Page 17)

17
6.4L Power Stroke ® V-8 Turbo Diesel
PERFORMANCE/HANDLING
This page is about:
2008 F-250/F-350/F-450
Super Duty ® Pickups
Performance/Handling
July 2007
F-250/F-350/F-450
SD Pickups
Diesel Engine
Low-pressure turbo
EVRT TM
6.4L Power Stroke ® V-8 Turbo Diesel
• 350 horsepower @ 3000 rpm
325 horsepower @ 3000 rpm (F-450 with 6-speed manual
transmission or 4.88 rear axle)
• 650 lb.-ft. of torque @ 2000
600 lb.-ft. of torque @ 2000 (F-450 with 6-speed manual
transmission or 4.88 rear axle)
• Cast iron block and heads provide a durable foundation
• Larger exhaust valves than 6.0L
– Improve engine breathing
– Optimize fuel economy and performance
• Improved emissions
– Reduced particulate output
– Emits 85 percent less pollutants than previous model year
diesel engine
• Improved engine control module (ECM)
– Fuel and engine controls integrated into the same cast
aluminum housing
– Allows engine technologies to operate properly
– Durability tests doubled to ensure robustness and long life
• High-pressure common-rail (HPCR) fuel system pressurizes the
fuel system to 28,000 psi and injects the fuel into the cylinders
through piezo-actuated injectors
• Piezo-actuated injectors are capable of delivering up
to five injections per combustion cycle and include the
following benefits:
– Instant response for optimized acceleration, improved
cold start at –20 degrees F, and better emissions control
– Quiet operation throughout the entire rpm range (similar
to gasoline-engine noise levels)
– Injectors and fuel pump placed inside valve cover for
quieter ride
• Dual Sequential Turbo helps improve response throughout the
engine’s power band and includes the following benefits:
– Better low-speed performance, improved acceleration and
power at altitude
– First turbo in the series features an Electronic Variable
Response Turbocharger (EVRT TM ). The second, larger,
fixed low-pressure turbo comes on at higher rpm and at
optimum speed
– EVRT comes on at low rpm to provide extra boost
at takeoff
– EVRT changes the position of the turbine blades based on
engine demand
– As rpm increase, the larger fixed low-pressure turbo kicks
in to boost power through the middle of the torque curve
– Fixed low-pressure turbo takes over at optimum speed
A CLOSER LOOK: Dual Sequential Turbo
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