Quoted: about ms flight sim, the jet engine, how does the n1 and n2 and itt all interact?
why does the n2 turn red at 90?
also, why does the n2 drop as the plane reaches higher altitude, but the throttle never changes?
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ITT is Interstage Turbine Temperature, if I have that right. It's basically a reading of the temperature between the turbine stages at the exhaust part of the engine. Gives you a way to monitor engine health and performance. Other similar types you'll see are TIT (Turbine Inlet Temperature) and EGT (Exhaust Gas Temperature).
N1 is the Fan stage RPM measured in percent. The fan stage is the low pressure compressor on the front of the inlet part of the engine.
N2 is the Compressor stage RPM measured in percent. The compressor stage is the high pressure compressor after of the Fan stage, before the combustion chamber.
Why does N2 turn red above 90%? Dunno, guess it's just that aircraft you're flying.
N2 is dropping at altitude because of thinner air. One thing you'll notice the higher you get, is ITT (or TIT or EGT) will increase as well.
Most jets are flown via N2 and Fuel Flow. Some are flown by EPR (Engine Pressure Ratio), which is a ratio of the inlet air and the exhaust air.