Koenigsegg ECU or safety mechanisms would be the cause if the engine drops power, the engine has momentum and lack of surface traction going for it. it would just spin the tires watch this video starting 9:30 to get a glimpse of what I'm talking about https://www.youtube.com/watch?v=5Fe3ub76pb4
Estimated times based on my analasis the Nevada 0-400-0 run. 1/4 10.66 at 165.8 mph 1/2 15.77 seconds at 207.6 mph
1 mile 23.575 at 244.95 mph. It's amazing, but the Chiron is actually still ahead at the mile marker based on my calculations. Id estimate that it takes the Agera RS 2 kilometers from a standing start to catch the Chiron.