As the leader of the race team, he oversees the construction and fine-tuning of a race car. Throughout race weekend he communicates what changes should be made to the race car and on race day he determines the race strategies.
Crew is a sub's workers. Chief is a head "mechanic", lead carpenter, job foreman etc.
Lead mechanic that makes decisions or implements changes to the car for racing conditions.
The race team leader at the racing venue. When the race team arrives at the track for an event, the crew chief is in charge of the car and mechanical crew. During the race the crew chief is in charge and makes the decisions regarding pit stops, tire changes, and chassis adjustments.