Exhaust gas runs through a turbine, hence 'Turbo'. Typically this cools exhaust. Whether or not the higher combustion temperature from the compressed inlet gas makes up for this is not known to me.
Exhaust gas is hotter on turbo engines. It’s why you have to watch exhaust gas temperature like a hawk when off road. High revs with little movement causes EGRs to melt down. 450-650C.
I acknowledged that this could still be true in my comment, but that I would have to actually do some analysis. However, what the parent comment said is wrong. Your gas is going to lose internal energy to shaft work as it moves through the turbine, which then compresses the inlet air.
Not saying its not hot or hotter, I'm saying the air is not moving through a compressor (which /would/ heat the gas as it does work on the gas to move it to higher pressure), it moving through a turbine, which is recapturing the internal energy of the exhaust gas to improve the efficiency of the engine.
>EGTs are usually measured close to the head. This provides a much quicker response time as well as a more accurate reading. In fact, the temperature of the exhaust gas following the turbocharger can be as much as 200 to 300 degrees lower than the temperature upstream of the turbo. Air resistance caused by the turbo itself can also cause increases in the temperature upstream that would not be detected past the turbo.
The comparison was originally EGT for turbocharged engines vs non-turbocharged engines.
Yes, the temps right out of the head are higher before the turbine vs after for sure, but temperatures going into the cat converter are still generally higher in a turbocharged application compared to an aspirated engine.
I was just salty I got down voted or 'Flagged' or whatever. I completely believe the turbo's higher combustion efficiency means higher temp downstream of the >Turbine<
'hot' vs 'hotter'. Unless I'm fundamentally misunderstanding physics, when flowing gasses do work, they decrease in temperature. They might increase in velocity, but they decrease in temperature.