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SAE J2453 (SEP2011)

Current Revision

Manual Transmission and Transaxle Efficiency and Parasitic Loss Measurement

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Because of the intense focus on CAFE and fuel emission standards, optimization of the automobile drivetrain is imperative. In light of this, component efficiencies have become an important factor in the drivetrain decision-making process. It has therefore become necessary to develop a universal standard to judge transmission efficiency. This SAE Recommended Practice specifies the dynamometer test procedure which maps a manual transmission’s efficiency. The document is separated into two parts. The first compares input and output torque throughout a specified input speed range in order to determine “in-gear” transmission efficiency. The second procedure measures parasitic losses experienced while in neutral at nominal idling speeds and also churning losses while in gear. The application of this document is intended for passenger car and light truck. All references to transmissions throughout this document include transaxles.

SDO SAE: SAE International
Document Number J2453
Publication Date Sept. 2, 2011
Language en - English
Page Count 13
Revision Level 201109
Supercedes
Committee
Publish Date Document Id Type View
Sept. 2, 2011 J2453_201109 Revision
Aug. 30, 1999 J2453_199908 Revision