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- #261
The thought crossed my mind, after learning you're running a 160 thermostat. But you've a fuel/air/spark that is different than stock. In your case it makes sense, to run cooler. For one; Boost is safer with a loose engine, according to a machine shop I've been speaking with. A hot engine runs tighter. Additionally your TRD package likely runs richer to accommodate the forced air. I suspect you've a tweek to the ECU, to run rich. But really, TRD package and boost is above my pay grade.Have you ever thought about testing a 160* thermostat just to see what happens? The part is relatively inexpensive at about $35 and it would be interesting to see if it might help to keep the ECT temps to something that works better with the fuel temps.
I haven't ever had my 42 gallon tank boil over, but I have gotten some excessive venting before when I was at elevation in the San Juans. It was boiling, but just slightly. It tends to be the San Juans causing most of the issues because of all of the high mountain passes. Most of the trail leaders will warn people to just leave their trucks running when we stop for a few minutes to avoid a no start situation due to fuel problems. If I remember correctly, it is the 06-07 that seem to have the biggest issues with not restarting due to fuel problems at elevation.
It might also be worth it to pop into the Colorado Plans Silverton thread and see if anyone had any issues while it is fresh on their minds. Colorado plans Silverton July 22nd-26th
I do feel, your's (a heavy 99 with a "few miles") is additional anecdotal evidence, running cooler ECT is key. As you're not experaning fuel boiling pressure issues.