Welcome to the site!!
This is the first time I have heard about the IS-F getting really hot real quick during race time. I have no idea why this would be, it is designed for higher speeds. Perhaps the temp you were at was a little high for the car. I have no idea what the ideal temperature to run these engines is (according to a friend, it is between 55-70 degrees, but I have no idea how accurate that is). It could just be a combination of the altitude and heat....
It's funny you mention your engine getting hot though, I recently did one lap around a track here in Texas with my IS-F in muggy, 98 degree weather. As I was slowing down the car towards the end of the lap, the oil temp. gauge had risen one bar, which I found interesting. I'm just going to guess its because it was so hot and muggy as it hasn't happened before
I hope someone can help you better, in face I'm sure someone can
Welcome again 
This is the first time I have heard about the IS-F getting really hot real quick during race time. I have no idea why this would be, it is designed for higher speeds. Perhaps the temp you were at was a little high for the car. I have no idea what the ideal temperature to run these engines is (according to a friend, it is between 55-70 degrees, but I have no idea how accurate that is). It could just be a combination of the altitude and heat....
It's funny you mention your engine getting hot though, I recently did one lap around a track here in Texas with my IS-F in muggy, 98 degree weather. As I was slowing down the car towards the end of the lap, the oil temp. gauge had risen one bar, which I found interesting. I'm just going to guess its because it was so hot and muggy as it hasn't happened before
I hope someone can help you better, in face I'm sure someone can