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This procedure is specifically designed to determine a fuel rate versus torque map for heavy-duty spark ignition and diesel engines as determined at the DOT/SAE Truck & Bus Fuel Economy Measurement Conference April 21–23, 1975. This engine performance map, when combined with accessory losses, transmission and driveline losses, vehicle aerodynamics, etc., can be used with vehicle operating profiles in a computer program to simulate vehicle fuel economy. Use of this procedure results in torque and fuel rate being measured at 30 data points, minimum, and friction torque, either measured or calculated, at five data points, minimum. Testing is accomplished using a procedure very similar to SAE J816b, but actually is quite different since this is a specific test for a specific purpose rather than a general test code as specified in J816b. It is recommended that the test be run at inlet air temperatures as near as possible to the standard specified in J816b so as to minimize correction.

This SAE Recommended Practice has been adopted by SAE to specify: a A standard procedure for chassis dynamometer testing of heavy-duty road vehicles for the purpose of determining power delivered through the drive tires. b A method of correcting observed power to reference test conditions. c A method of analyzing the test data to determine if the test results are within expected power ranges.

This SAE Standard has been adopted to provide a basis for dynamometer determination of gross engine power and torque under reference conditions. It is intended for use primarily by engine manufacturers who supply engines for installation by others in applications where the engine manufacturer may not control the induction and exhaust system design or the speed at which the engine is run.

This SAE Standard has been adopted to provide a basis for dynamometer determination of gross engine power and torque under reference conditions. It is intended for use primarily by engine manufacturers who supply engines for installation by others in applications where the engine manufacturer may not control the induction and exhaust system design or the speed at which the engine is run.

This standard test code has been adopted by SAE to specify: (a) A laboratory engine dynamometer test procedure. (b) A basis for engine power rating. (c) A method for correcting observed power to standard inlet air conditions. The pressure and temperature correction formulas contained herein should be used only within the specified range of conditions (see paragraph 8.4.1) and are not intended for altitude derating.

This standard test code has been adopted by SAE to specify: (a) A laboratory engine dynamometer test procedure. (b) A basis for engine power rating. (c) A method for correcting observed power to standard inlet air conditions. The pressure and temperature correction formulas contained herein should be used only within the specified range of conditions (see paragraph 8.4.1) and are not intended for altitude derating.

This standard has been adopted by SAE to specify: