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Optimal Gearing for Customer Satisfaction

When it comes to maximizing customer satisfaction with a drivetrain, vehicle gearing and parameter settings are important aspects to consider. Multiple factors can affect the gearing, such as tires, transmission and axle ratios and electronic engine parameters such as Vehicle Acceleration Management (VAM), Load-Based Speed Control (LBSC), Gear-Down Protection (GDP) and Idle Shutdown. Besides those settings, you need to understand your customer’s expectations in order to provide a product that satisfies the needs of the owner as well as the driver.

2013 ISX15 – 400-450 hp

 Application
Max Fuel  Economy (rpm) Balance (rpm) Performance (rpm)
 Linehaul  1250-1400  1350-1500  1500-1700
 Vocational/ Heavy Haul  1500-1580  1550-1650  1600-1700

2013 ISX15 – 451-600 hp

 Application  Balance (rpm)  Performance (rpm)
 Linehaul  1400-1550  1500-1800
 Vocational / Heavy Haul  1400-1600  1550-1800

ISX15 400 hp to 450 hp ratings have three gearing ranges: “Max Fuel Economy,” “Balance” and “Performance.”

“Max Fuel Economy” gearing range is for customers who are fuel economy-focused, and involves spec’ing the driveline for intended cruise speeds towards the lower rpm range. The best-in-class low-end torque of the 2013 ISX15 enables downspeeding for Max Fuel Economy.  Customers hauling up to 110,000 lb gross combined vehicle weight (GCVW) and looking for fuel economy with performance should consider a 2013 ISX15 450 ST rating.

“Balance” gearing range provides an acceptable level of fuel economy and power.

“Performance” gearing range delivers higher power, and is desirable only in certain situations, such as for a truck with a very heavy load operating on steep roads; fuel efficiency will be affected.

Vocational and heavy-haul ratings provide more power to get the job done. Gearing at higher RPMs will enable the engine to operate closer to peak power band for balance and performance.

2013 ISX15 engines rated at 485 hp to 600 hp are ideal for vocational and heavy-haul duty cycles. The ISX15 achieves peak torque at 1200 rpm. These ratings are designed for applications and drivers looking for application-specific performance.

2013 ISX15 engines rated at 485 hp to 600 hp are ideal for vocational and heavy-haul duty cycles. The ISX15 achieves peak torque at 1200 rpm. These ratings are designed for applications and drivers looking for application-specific performance.

2013 ISB6.7

 Application/GCVW  Max Fuel Economy (rpm)  Balance (rpm)  Performance (rpm)
 Linehaul: Up to 33,000 GCVW  1700-1900  1850-2150  2150-2400
 Linehaul: Up to 50,000 GCVW  1800-1950  1950-2200  2200-2400
 Vocational  2000-2100  2100-2300  2300-2400

The ISB6.7 engine has two on-highway gearing recommendations, depending on the combined gross vehicle weight. It is possible to gear down to 1700 rpm when a truck is spec’d to carry up to 33,000 lb. However, when your customers are pulling loads between 33,001 lb and 50,000 lb GCVW, the gearing recommendation for maximum fuel economy increases by 100 rpm, and the band narrows. For balanced operation, the band is broader, with recommended gearing starting 100 rpm lower (compared with 50,000 lb) than spec’ing a truck up to 30,000 lb GCVW. Gearing for performance starts at the same rpm range, regardless of weight.

Vocational applications have an operating range from 2000 rpm to 2400 rpm. When spec’ing for maximum fuel economy in vocational applications, you want to gear for 2000 rpm to 2100 rpm. Balanced gearing starts at 2100 rpm, and expands until 2300 rpm. Gearing for performance ranges from 2300 rpm to 2400 rpm.

2013 ISL G
ISL G natural gas engines are designed to deliver a balance of fuel economy and performance.

 Application  Fuel Economy (rpm)  Balance (rpm) 
 Linehaul, up to 66,000 lb  1700-1800  1800-2000
 Vocational  1750-1900  1800-2000
 Refuse, Mixer  N/A  1800-2000

The ISL G can be selected for trucks that will be operating up to 66,000 lb GCVW and up to 60,000 miles per year.

Cummins PowerSpec can also help you identify the correct axle ratio, gearing recommendations and specifications for the equipment you run, and can set programmable features. For more details, visit powerspec.cummins.com.

Contact your Cummins representative for additional gearing information to make sure that your customers’ trucks deliver the optimum combination of driveability, fuel economy and power to meet their performance objectives and deliver the best possible customer satisfaction.

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