As 7-year-old Ben Thiem climbed behind the steering wheel to test his skills with a real-life NASCAR race car Wednesday afternoon, there were really only four words that mattered: Go fast, turn left. Racing around a digital version of Texas Motor Speedway, Thiem seemed to be a fast study of the technique sitting inside a NASCAR simulator parked outside his family’s business, Outside Inn in Nevada City. Though he struggled to reach the gas pedal during the three-lap race, he did reach a top speed of 137 miles an hour before banging into the wall above the high banking of …