Yes, my friend with a 750ºC (1400ºF) EGT is doing very well, I was racing with him yesterday, but that high EGT won’t necessarily give you more power than let’s say an IAME X30 with the usual 650ºC (1200ºF) EGT.
Both engines, Rotax and IAME, are working it their maximum power at different EGTs, Rotax DD2 34hp at 750ºC EGT, IAME X30 30hp at 650ºC EGT, or for that matter, IAME Super Shifter 175cc 49hp at 650ºC EGT.
So basically, if I’m not mistaken, we are all trying to reach the highest EGT possible without seizing the engine, in order to get the maximum power out of each engine.
Now, I understand the value of an EGT, but I’ve seen engines seizing at low EGTs and I’ve seen engines not seizing at very high EGTs, in order words, there are many things that can cause an engine to seize, other than a very high EGT.
And yes, You are absolutely right, when an EGT starts to go down at the end of a straight, that’s when you have to worry, or it will cost you.
Maybe we should all forget about an EGT sensor and only rely on a Lambda sensor, wouldn’t that be better, more precise, easier to keep an eye on… ?