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Message: <blockquote data-quote="Purple97GT" data-source="post: 200644" data-attributes="member: 9882">I noticed my car does this after the PI longblock swap, too. At the end of the 1/4 mile at Beech Bend in June, my temp gauge was 3/4 the way up after nearly every run (I hot lapped lol), but would cool back down on the return road back to the staging lanes. I also noticed it did this on the interstate in the summer a few times running 70+mph.My coolant is good, my thermostat is good, no air in the system, etc. This leads me to believe that maybe the radiator just can't keep it cool with the PI. Maybe we need a bigger radiator, or maybe just running a cooler t-state and program the fan to come on earlier would do it?I haven't felt my car ping, so I don't think it's going lean.Is there a way to get the SCT Xcal2 to turn on the fan earlier, or will I have to get Dynospeed to add that in my tune?With the weather cooling down, I'll probably not work on this until next summer, though. :hammer:</blockquote>