At the end of the straight line, he goes into the corner at approximately 90km/h or slightly less. If you know the lenght of straight, I could tell you his approx top speed aswell. Also, you may take into account that this car goes from 0 to 200 km/h in just 5 seconds.
But damn, it was worth waiting for these videos. I could only imagine the fun you had - so so jealous right now, hehe. And congratulations for fulfilling your long time dream.