It's different than Madhouse, but still not 100 percent truthful.
(Preface: I attended all the races at Bowman Gray this season while they filmed, and use a 2 scanner set -up to listen to the teams/drivers).
The sound effects they have added to the show are terrible. Like a poorly done video game. They also have spliced made up radio communications in with real ones.
FYI....spotters almost never, ever say the car number at Bowman Gray when talking to a driver. They use the driver's name or nickname. So, when you hear on the tv show :car 79, or car 4, or car 83....that's post production added dialogue to help with the story. Some of it is real, Tim did say right after the wreck in the 200 he thought he had broke both his thumbs.
They could have had a much better show if they did the Sportsman division there and wouldn't have to make up anything.