Heavy Duty Trucking

NOV 2014

The Fleet Business Authority

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48 HDT • NOVEMBER 2014 www.truckinginfo.com "This is our entry into the down-speeding realm," says Brad Williamson, DTNA's manager of engine and component marketing. "We offer a higher torque engine with a lower axle ratio, which allows you to operate at lower engine rpm for better fuel economy." The torque and horsepower curves show the engine produces its best torque between about 1,000 and 1,300 rpm, and close to peak horsepower between 1,300 and 1,625 rpm. Wil- liamson says customers who operate in rolling terrain will see the greatest ben- efit from this powertrain choice, while those running in flat or mountainous terrain may prefer a more traditional powertrain option. "DP15i uses preloaded terrain maps and GPS to look out about three miles ahead and then, with the help of load and grade sensors, fuels the engine according to need," he says. "Once you have the system engaged, the driver doesn't need to touch the brake or the accelerator. The system is managing everything as efficiently as possible." Williamson says the IPM will be standard on all DT12 packages begin- ning in 2015. At the launch event, Williamson said the new powertrain packages could net certain customers us- ing the 6x4 or 6x2 configurations efficiency gains of up to 5.2% and 7.6% respectively, compared to a baseline powertrain consisting of a DD15 455/1,550, a 10-speed manual transmission, and a Detroit 6x4 with a 2.53: ratio. As is usually the case, he wouldn't discuss pricing during his presentation, so it would remain with the buyer to hammer out the ROI potential at the time of purchase. Western Star has also added a few safety and driver convenience features. A new wood- and leather-wrapped steering wheel has thumb control functionality for navigating the driver display menus as well as headlamp and marker lamp interrupt (if anyone still does that little courtesy), cruise control, phone pickup and disconnect, volume control and mute. "It's not just a lapped on system," Jesus Gomez Director of Engineering at Western Star Trucks. "We worked with WABCO to calibrate their system for the particulars of the Detroit powertrain and our braking system, so it behaves as you'd expect a Detroit product to behave." First impressions You can't tell much from the inside about how the outside is doing from an aerodynamic perspective, except to observe the noise. Non-aero trucks test drive SPECIFICATIONS CAB Welded galvannealed steel with roped- in or bonded two-piece windshield BUMPER Modular four-piece bumper with under-valance panel and polished stainless steel fascia HEADLIGHTS Modular three-piece headlights with projector beam halogen bulbs and LED marker lights INTEGRATED POWERTRAIN Detroit DD15, 14.8L, 400 hp, 1,750 lb-ft, downsped Detroit DT12 Automated manual transmission Detroit tandem 6x4 or single drive 6x2 with tag axle @ 40,000 lbs ENGINE OPTIONS Detroit DD13, 12.8L, 350-470 hp, 1,250-1,650 lb-ft Detroit DD15, 14.8L, 455-505 hp, 1550-1750 lb-ft Detroit DD16, 15.6L, 475-600 hp, 1,850-2,050 lb-ft TRANSMISSION Detroit DT12 AMT Eaton Fuller manual (9, 10, 13, 15 and 18-speed) FRONT AXLE Detroit single 12,000-14,700 lbs Hendrickson single 12,500 lbs REAR AXLE Detroit single 23,000 lbs Detroit tandem 40,000-46,000 lbs Meritor tandem 40,000 lbs FRONT SUSPENSION Taperleaf 12,000-14,600 lbs Hendrickson AirTek 12.5k air suspension REAR SUSPENSION AirLiner 23,000-46,000 lbs BRAKES Available drum and disc Wabco 4S/4M, 6S/4M, 6S/6M ABS with and without traction control SAFETY Enhanced stability control Roll stability control Lane departure warning system Adaptive cruise control Wabco OnGuard radar collision avoidance/mitigation system That small raised corner of the hood helps guide air up the face of the windshield, and the sun visor helps direct the airflow over the roof. The cavernous West- ern Star interior hasn't changed, except for updated color schemes and LED lighting. It still boasts real wood cabi- nets and rich upholstery.

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