Current Requirements To Achieve Engine Operation in The "NTE Zone"
When all of the following conditions are simultaneously met for at least 30 seconds, and engine is considered to be operating in the NTE zone.
- Engine speed must be greater than 15% above idle speed
- Engine torque must be greater than or equal to 30% of maximum torque.
- Engine power must be greater than or equal to 30% of maximum power.
- Vehicle altitude must be less than or equal to 5,500 feet (1,700 m).
- Ambient temperature must be less than or equal to 100 °F (38 °C) at sea level to 86°F at 5,500 feet (1,700 m).
- Brake specific fuel consumption (BSFC) must be less than or equal to 105% of the minimum BSFC if an engine is not coupled to a multi-speed manual or automatic transmission.
- Engine operation must be outside of any manufacturer petitioned exclusion zone.
- Engine operation must be outside of any NTE region in which a manufacturer states that less than 5% of in-use time will be spent.
- For Exhaust gas recirculation (EGR) equipped engines, the intake manifold temperature must be greater than or equal to 86-100 degrees Fahrenheit, depending upon intake manifold pressure.
- For EGR-equipped engines, the engine coolant temperature must be greater than or equal to 125-140 degrees Fahrenheit, depending on intake manifold pressure.
- Engine after treatment systems’ temperature must be greater than or equal to 250 degrees Celsius.
Read more about this topic: Not-To-Exceed
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