OK.... It was quite hot today so that might have added to the problem, but I've never had this happen before. First session was around 4:15 PM and it was hot and humid. I rolled out and warmed up the tires as usual on the first lap and then started to increase speed in successive laps. BTW - I tried some new tires on my track wheels today and was very pleased: Firestone Firehawk Indy 500's. They were only $170 a tire for 285/35/19 and after I scrubbed them in they performed beautifully. Anyway.... halfway through the first session, my supercharger overflow tank starting spitting coolant on my windshield every time I got into the boost. I pitted and lifted the hood, but couldn't see anything wrong so I went back out on track. Towards the end of the session, it was pretty bad and was basically spewing coolant at that point so I came in and parked the car with it running, popped the hood, and pulled my fan in front of the car to assist in cooling everything off. The aftermarket over flow tank was bulging and I carefully removed the cap only to see the coolant boiling in the tank. After a few minutes, everything returned to normal.
Second session presented the issue again, but much sooner this time and the computer also threw a code halfway through the session. The engine temps/oil pressure and temps were fine so I kept running, but slowed down and tried to stay out of the boost. As long as I did that, I didn't get the coolant shower on my windshield. I checked the code when I got back to the pits and it said, "Intake air temp too high". Yeah... No shit Sherlock! Tell me something I don't know. Third session was more fun as I was learning to manage the situation better and basically was focusing on braking points, entry speed and corner exit. The Indy 500's were doing their job well so I found some enjoyment, but it really sucked when I was getting passed by every car on track down the straights because I was having to ease on the throttle.
With all the mods I did to combat heat issues, the only thing I have not done (which I really don't want to do at this point) is change the supercharger. One guy was running a TVS on his GT500 and he had the same problem. In addition, that dreaded engine intermittent tick seems louder now? Call me crazy. Lastly, I got home and changed the wheels back to my street set up. When I started the car again, there was a short high pitched squeal which presented itself a couple of times when I revved the engine and then went away. I'm going to see if it does it again in the morning. The engine tick was also present and then went away after I drove the car for a few minutes to get the TPMS back online.
I have already replaced my supercharger pulley bearing in 2016 and wonder if the excessive heat today may have created another issue. Thoughts anyone?