What speeds are typically tested in a two-speed idle test?

In a two-speed idle test, the typical speeds that are tested are 2500 rpm and idle. This approach is designed to assess the emissions at both a low and a higher engine speed, allowing for a comprehensive evaluation of the vehicle's emissions performance under different operating conditions.

During the idle portion of the test, the vehicle's engine is running at a low speed, allowing for the measurement of emissions when the vehicle is stationary and the engine is at rest. This can indicate how efficiently the vehicle idles and how well it controls emissions without additional load.

The higher speed, usually set at 2500 rpm, helps to simulate a more dynamic driving condition where the engine is operating under greater load and is revved higher, which can reveal behaviors and emission levels not captured at idle. Therefore, capturing these two specific speeds is critical for thorough analysis in emissions testing, ensuring compliance with environmental standards.