It is a good thing to get egt as high as possible before max torque point. This has the turbo working at its ability. Obviously there are still safe limits to all of this.
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Hodge this is kind of what you saw with the crd. Its not really about having the lowest egts. Like engine operating temperature what you want is stability. So a quick rise to temperature but then to maintain the temperature.
Remember the 500-550 max safe temp post turbo is for short periods not a point to slow down. If the egts get to 500 but plateau there while say climbing a hill or accelerating on to the highway then that is fine.