Automotive Engineering - June 2016 - 17

TECHNOLOGY REPORT

TESTING

Ford upgrades dyno sleds to handle 2017 Super Duty diesel's might
What happens when the performance of your newly-developed
vehicle exceeds the capabilities of the test equipment used to
measure it? Ford Truck engineers faced that dilemma while
preparing for the SAE J2807 towing tests of the all-new 2017
F-Series Super Duty.
Their conclusion: "We need a new dyno."
The SAE J-standard, "Performance Requirements for
Determining Tow-Vehicle Gross Combination Weight Rating and
Trailer Weight Rating" (http://standards.sae.org/j2807_201602/)
replicates how a laden vehicle climbs the infamous Davis Dam
grade-a daunting 11.4-mi (18.3-km) section of Arizona State
Road 68 near the Colorado River. That long, tortuous pull starts
at sea level and climbs to above 3000 ft, and its maximum 7%
grade-a seven-foot incline per every 100 ft of linear distance-is
renowned among automotive test teams for overtaxing cooling
systems, frying brakes, and separating the champs from the
chumps in terms of towing and hauling capability.
During development of the 2017 F-250/350, Ford engineers
recognized that the increased torque of the 6.7-L diesel V8,
expected to exceed 900 lb·ft (1220 N·m) and top that of the
2016 Ram's Cummins diesel (Ford has yet to release its SAEcertified power and torque ratings), along with the new
truck's significantly stiffened chassis, would outpace the capability of their existing dyno sleds.
This is no real surprise, given the steady escalation of
American diesel pickup muscle. Consider that Ford's first 6.9-L
diesel V8 (Navistar-built) entered the fray in 1982 with 170 hp
(127 kW) and 315 lb·ft (430 N·m). The 2016 Super Duty's 6.7-L
V8 delivers 440 hp (328 kW) and 860 lb·ft (1166 N·m)-output
that not long ago would've qualified for Class-8 truck duty.
"In more than 25 years of doing this [tow testing] work, we
used the same dyno, which did the job," explained Jim
Sumner, Ford product development engineer. "But the new
truck is so powerful we needed new equipment to test out its
capability." The upgraded towing dynamometer is in service
at Ford's Arizona Proving Grounds, allowing engineers to simulate the actual Davis Dam road testing (as well as testing on
other U.S. mountain highways).
Engineers upload digitized map topography to the dyno
sled, which adjusts to the correct grade. The sled employs
an electric brake limiter to provide drawbar "pull" against
Ford test engineer
observes vehicle
towing performance
while undertaking
SAE J2807 testing at
the Arizona P.G.

2017 Super
Duty prototype
with new
Taylor RSL25K dyno sled
replicates the
Davis Dam
climb at Ford's
Arizona P.G.

Slick and
compact RSL25K Taylor
dyno sled
weighs 6173 lb,
has maximum
drawbar
capability of
5620 lb.
the vehicle, simulating a climb even while on level ground.
Designed and supplied by Milwaukee-based Taylor
Dynamometer (http://www.taylordyno.com/), the RSL-25K dyno
sled acquired by Ford is capable of a maximum drawbar pull of
5620 lb (2549 kg)-a 181% increase compared with the 2000 lb
(907 kg) from Ford's previous dyno. This enabled simulation of
steeper hills, Sumner noted. He said a common simulated grade
used for testing is approximately 7%, to replicate the Davis Dam
run, but the new towing dynamometer used at Ford's Arizona
Proving Grounds can simulate up to a 30% grade.
The SAE J2807 standard includes acceleration, climbing,
launching, and vehicle weight parameters. Vehicles with a gross
vehicle weight rating (GVWR) less than 8500 lb (3855 kg) must
carry a 150-lb (68-kg) driver and a 150-lb passenger. Vehicles
heavier than 8500 lb add an extra 100 lb of equipment.
For a given trailer weight, J2807 compliance means the tow
vehicle must accelerate to 30 mph in under 12 s, and accelerate to 60 mph in under 30 s. Roll-on acceleration 40 to 60
mph on a level surface must be accomplished in under 18 s.
Vehicles with dual rear wheels are permitted extra time to
complete this test. For the climb test that replicates Davis
Dam, tow vehicles must sustain a minimum 40 mph with their
A/C on its highest setting. "Duallies" again have a lesser (35
mph) minimum-speed bogie.
The J2807 launch test replicates a 12% grade, and requires
the tow vehicle to move 16 ft (4.9 m) uphill, from a standstill,
five times within five minutes in both forward and reverse.
Expect GM, FCA, and possibly Nissan to follow suit and upgrade to more-capable testing equipment-good news for
Taylor and other dyno makers-as the industry battle for
heavy-duty pickup hauling and towing bragging rights shows
no sign of abatement.
Lindsay Brooke

AUTOMOTIVE ENGINEERING

June 2016 17


http://standards.sae.org/j2807_201602/ http://www.taylordyno.com/

Automotive Engineering - June 2016

Table of Contents for the Digital Edition of Automotive Engineering - June 2016

Automotive Engineering - June 2016
Contents
Editorial
Technology Report
How Porsche met cooling challenges on the new 4-cylinder Boxster
Brembo brake-by-wire will be productionready before 2020
Powering up the new stop-start systems
Google talks self-driving vehicle development
Ford upgrades dyno sleds to handle 2017 Super Duty diesel’s might
A 24-hour battle of speed and efficiency
Pushing the ICE forward, gradually
Smile, you’re on Magna camera!
Multi-material body solutions: Possibilities and manufacturing challenges
Global Vehicles
Second time a charm for Honda’s unibody Ridgeline pickup?
Jaguar puts a brave Pace on testing its new crossover
Focus RS: Ford and GKN create an AWD masterpiece
Product Briefs
What’s Online
Companies Mentioned, Upcoming, Ad Index
Q&A
Automotive Engineering - June 2016 - Intro
Automotive Engineering - June 2016 - Automotive Engineering - June 2016
Automotive Engineering - June 2016 - Cover2
Automotive Engineering - June 2016 - Contents
Automotive Engineering - June 2016 - Editorial
Automotive Engineering - June 2016 - 3
Automotive Engineering - June 2016 - How Porsche met cooling challenges on the new 4-cylinder Boxster
Automotive Engineering - June 2016 - 5
Automotive Engineering - June 2016 - 6
Automotive Engineering - June 2016 - 7
Automotive Engineering - June 2016 - Brembo brake-by-wire will be productionready before 2020
Automotive Engineering - June 2016 - 9
Automotive Engineering - June 2016 - 10
Automotive Engineering - June 2016 - 11
Automotive Engineering - June 2016 - Powering up the new stop-start systems
Automotive Engineering - June 2016 - 13
Automotive Engineering - June 2016 - 14
Automotive Engineering - June 2016 - Google talks self-driving vehicle development
Automotive Engineering - June 2016 - 16
Automotive Engineering - June 2016 - Ford upgrades dyno sleds to handle 2017 Super Duty diesel’s might
Automotive Engineering - June 2016 - A 24-hour battle of speed and efficiency
Automotive Engineering - June 2016 - 19
Automotive Engineering - June 2016 - 20
Automotive Engineering - June 2016 - 21
Automotive Engineering - June 2016 - 22
Automotive Engineering - June 2016 - 23
Automotive Engineering - June 2016 - Pushing the ICE forward, gradually
Automotive Engineering - June 2016 - 25
Automotive Engineering - June 2016 - 26
Automotive Engineering - June 2016 - 27
Automotive Engineering - June 2016 - Smile, you’re on Magna camera!
Automotive Engineering - June 2016 - 29
Automotive Engineering - June 2016 - 30
Automotive Engineering - June 2016 - Multi-material body solutions: Possibilities and manufacturing challenges
Automotive Engineering - June 2016 - 32
Automotive Engineering - June 2016 - 33
Automotive Engineering - June 2016 - 34
Automotive Engineering - June 2016 - Second time a charm for Honda’s unibody Ridgeline pickup?
Automotive Engineering - June 2016 - 36
Automotive Engineering - June 2016 - Jaguar puts a brave Pace on testing its new crossover
Automotive Engineering - June 2016 - 38
Automotive Engineering - June 2016 - 39
Automotive Engineering - June 2016 - Focus RS: Ford and GKN create an AWD masterpiece
Automotive Engineering - June 2016 - 41
Automotive Engineering - June 2016 - Product Briefs
Automotive Engineering - June 2016 - 43
Automotive Engineering - June 2016 - 44
Automotive Engineering - June 2016 - 45
Automotive Engineering - June 2016 - What’s Online
Automotive Engineering - June 2016 - Companies Mentioned, Upcoming, Ad Index
Automotive Engineering - June 2016 - Q&A
Automotive Engineering - June 2016 - Cover3
Automotive Engineering - June 2016 - Cover4
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