G4500

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Goshen Coach Inc., A Thor Company submitted a model G4500, diesel-powered 17 seat (including the driver) 26-foot bus, for a partial STURAA test in the 7 yr/200,000 mile category.  The Federal Transit Administration determined that the following tests would be performed; 1.2 Servicing, P.M., Repair & Maintenance, 2. Reliability, 3. Safety, 4. Performance, 5.7 Structural Durability Test, 6. Fuel Economy, 7.1 Interior Noise Tests and 7.2 Exterior Noise Tests.  Testing started on June 2, 2009 and was completed on August 28, 2009.  The Check-In section of the report provides a description of the bus and specifies its major components.

 

The primary part of this Partial Test was the Structural Durability Test, which also provides the information for the Maintainability and Reliability results.  The Structural Durability Test was started on June 3, 2009 and was completed on August 21, 2009.

 

The interior of the bus is configured with seating for 17 passengers including the driver plus 1 wheelchair position.  Free floor space will accommodate 12 standing passengers resulting in a potential load of 29 persons plus 1 wheelchair position.  At 150 lbs per person and 600 lbs per wheelchair position, this load results in a measured gross vehicle weight of 15,260 lbs.  In order to avoid exceeding the GAWR (4,600 lbs) of the front axle and (9,600 lbs) of the rear axle, ballast for 8 standing passengers was eliminated.  This reduction from full capacity resulted in an adjusted measured gross vehicle weight of 14,160 lbs and was used for all dynamic testing.  The middle segment was performed at a SLW of 13,510 lbs and the final segment was performed at a CW of 10,380 lbs.  Durability driving resulted in unscheduled maintenance and failures that involved a variety of subsystems.  A description of failures, and a complete and detailed listing of scheduled and unscheduled maintenance is provided in the Maintainability section of this report.

 

The Reliability section compiles failures that occurred during Structural Durability Testing.  Breakdowns are classified according to subsystems.  The data in this section are arranged so that those subsystems with more frequent problems are apparent.  The problems are also listed by class as defined in Section 2.  The test bus encountered no Class 1 or Class 2 failures.  Of the four reported failures, three were Class 3 and one was a Class 4.

 

The Safety Test, (a double-lane change, obstacle avoidance test) was safely performed in both right-hand and left-hand directions up to a maximum test speed of 45 mph.  The performance of the bus is illustrated by a speed vs. time plot.  Acceleration and gradeability test data are provided in Section 4, Performance.  The average time to obtain 50 mph was 15.81 seconds.

 

A Fuel Economy Test was run on simulated central business district, arterial, and commuter courses.  The results were 7.39 mpg, 7.45 mpg, and 13.31 mpg respectively; with an overall average of 8.49 mpg.

 

A series of Interior and Exterior Noise Tests was performed.  These data are listed in Section 7.1 and 7.2 respectively.

Number: 0908-P
Model: G4500
Manufacturer: GOSHEN COACH
Vin Number: 1GBKG316591136242