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CUMMINS 6.7L Turbo Diesel

DIESEL POWER MAGAZINE
dieselpowermag.com


Diesel Power stamp of approval: Best Improved Ride Quality, Best Value, Excellent Low-Speed Hauler. In years past, the Ram was known for its harsh ride quality and its rear end skipping across bumps. All of that has been solved-and was accomplished with the addition of rear hydraulic body mounts. The mounts consist of fluid (similar to hydraulic oil) flowing through small, internal chambers, which soften frame-to-body inputs and greatly help with vibration damping. The '11 GMs feature hydraulic body mounts as well, but the ride improvement was much more noticeable in the Ram.

Of the six diesel-powered trucks we tested, the Ram proved to be the best. With the improved ride quality mentioned above, a very capable engine well suited for towing, integrated brake controller, and the strongest exhaust brake available, the Ram had all the bells and whistles the other 3/4-ton trucks had-but for nearly $10,000 less.

Specs:
  • Engine: 6.7L I-6 Cummins
  • Transmission: 68RFE, six-speed auto
  • Horsepower: 350 hp at 3,013 rpm
  • Torque: 800 lb-ft at 1,500 rpm
  • Configuration: Crew Cab, four-wheel drive
  • Color: Deep Water Blue
  • Axle Ratio: 3:73
  • Curb Weight: 7,420 pounds (full fuel tank, no driver)

Likes:

  • Most effective exhaust brake
  • Driving coach helps drivers control their fuel economy strategy (we suspect the GM trucks would do even better in fuel economy testing if this simple technology was added)
  • Better rear seat room than Ford or Chevy



DIESELDIG.COM

For 2011, the Ram Heavy Duty diesel gets a sweeping package of upgrades and improvements to help it keep up in the red hot towing race between Ford and Chevrolet. While horsepower is always a top notch, with diesels, torque and towing capability are king.

Now boasting the ability to pull a 22,700-lb. trailer, the one-ton Ram 3500 Heavy Duty gets a power boost to its venerable 6.7-liter Cummins turbo-diesel engine increasing its torque to 800 lb.-ft. The power increase is combined with other upgrades that raise the Ram's gross combined weight rating (GCWR) to 30,000 lbs.

The power comes courtesy of new programming. A revised performance calibration allows what Chrysler now calls the "High-Output" 6.7-liter, six-cylinder Cummins Turbo Diesel to reach peak torque at 1,600 rpm and exceed the previous model's output from 1,200 through 2,800 rpm. While peak horsepower remains unchanged (350 @ 3,000 rpm), the engine's new calibration delivers more than 40 additional horsepower at typical highway cruising speeds.

Getting that power to the wheels is a new higher-rated torque converter to improve engine/transmission integration for better towing capability on grades and optimizes engine performance. In addition to the new PCM and torque converter, the 800 lb.-ft. High Output Cummins-powered Ram Heavy Duty trucks receive a new crankshaft damper, reducing engine noise and vibration (NVH).

On thing that sets this diesel apart from Ford and Chevrolet is that it meets 2010 EPA emissions regulations without the need for Diesel Exhaust Fluid (DEF). While many diesel car and truck owners have come accustomed to having to keep DEF on hand, it's nice not to have to worry about it.


Torques news
torquenews.com

In addition to offering class-leading torque and towing capacities, Ram wanted the new Cummins to be more convenient to own so the new 6.7L High Output Cummins is the only heavy duty diesel truck on the market that does not require the regular checking and filling of diesel exhaust fluid. The HO Cummins Ram does not use a modern urea system, as the Cummins does not create the high levels of contaminants found in the General Motors or Ford diesel exhaust ? making the new Cummins High Output the logical choice for today's "green" heavy duty truck owner.