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Well, max temp is a debatable topic but, for basic info. Aluminum(your pistons) melts around 1200 F(depending on alloy). I personally try to stay below 1150 on my pre turbo egt meter.

The tires are your problem, not your turbo! Other have just accepted the bigger tires kill it. Usually umo runs hotter than diesel. You need a bigger/different motor and better trans. A different turbo is not going to help you, and more boost or fuel will just over temp you.

How are you adding an effective inter-cooler? What did you do about the coolant controlled intake manifold? Did you make a custom intake manifold? How much boost do you make now? How much do you think you want? Is your max fuel rate turned up now? What's your max egt now?