s13 Sr20det turbo glowing red hot?

[twest7740]

Okay guy's I have been lurking in this thread for almost 2 years now but this issue finally got me to make an account as I cant find anybody with my same issue or someone who has posted a fix, and I kind of want an explanation of what is happening. So my car is an s13 with stock blacktop sr20, Basic swap stuff has been done but nothing other than that, yesterday at the track I made about 10 runs or so and I noticed my car was getting really close to the H, I pulled in and popped the hood to notice the exhaust housing of my turbo was glowing red hot, I am assuming that the turbo being so hot was what caused my cooling system to heat up and alert me of this, I let the car sit for awhile, removed my hood, checked the coolant, all was well, I go back out make I few runs and check it again, and it wasn't glowing, I probably made a good 20 runs after that and only noticed that the turbo got hot one more time, the coolant system did not, I let it cool down and did 1 more run, Figuring that we weren't going to make any more runs for the night I was sitting in a brake stand at maybe 1500rpms, and boom coolant skyrockets back to the H, I leave the car in 1st gear and it idle'd real slow back to the trailer and almost instantly the coolant temp dropped once I was moving, So now my car does have a huge exhaust leak right before the o2 sensor on the turbo outlet, so exhaust was coming into the bay (hence why I removed the hood) since it was leaking before the o2 I was getting a false reading which should have made the car run rich correct? I replaced my spark plugs today and they looked as if my car was running a tad bit lean, my main question is why is my turbo overheating! its confusing the hell out of me.