High egt

More fuel = higher egt. Bigger windmill will solve that

 

Was this a factory setting turn up or a custom tune?

 

So the tune up included adjustment of valves (overhead)? Or just a give it more fuel tune? Air filter(s) clean? Turbo was mentioned already. Do you have a boost guage? Is it really pulling better? If boost is higher and pulling better, run it by the boost and exhaust temp. May have to drop a gear or a half gear to keep exhaust temps down. Don't pull it very long at 1200 deg. Or at least i wouldn't.

 

Yea don't hold it at 1200 for very long. 1100-1125 to be on the safe side

 

Since the probe is post turbo anything over 1000* is in the piston melting range for an engine with aluminum pistons. Turbo will normally take 3-500 degrees out of the exh temp depending on how efficient the turbo is. Guessing the easy fix is a slightly larger exh housing on the turbo to help with getting the hot air out of the engine. Not sure if I would push much more then 35-40psi of boost.

 

VGT is helping it not hurting it.. VGT works better then a non VGT.. Sounds like all they did was set the timing high to give you more HP... Im at 475 and only hit 800 with 80k gross going up a hill if i get into it.. Also running 1200 on the turbo u must really not want it to last.. Keep that thing under 900