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I run the 250 tune and had my temps hit close to that range in the desert at 110* called the vendor where I got the Spartan and was told not to worry to much about that temperature until 160 so I moved the alert to 160. Don't know what the importance is of it or what to do if it gets that hot but I assume it must have some impact on something important. Don't know if it has anything to do with the tuner though.
I do know that there is a fuel cooler that coolant flows throw to keep the temps down and it sometimes fails or gets air in it. My coolant and EOT will heat up if I get on it. Think its pretty normal since you are working the engine harder. I havent had any problems in 4K miles and I have been through some serious heat driving to Vegas.
2010 F250 CC, long bed, 4x4 Lariat with DPF/CAT delete and Spartan tuning, 2.5" leveling kit, 20x10 Fuel Kranks on Toyo AT II Xtremes.
2003 Harley Davidson Ultra Classic