Bremerton Motorsports Park, address 7500 Southwest Old Clifton Road. Port Orchard, WA 98367, is about a 1.5 hour drive from Seattle.
Ferry vs Driving
It takes about the same amount of travel time (1.5 hours) to drive from Seattle across the Tacoma-Narrows bridge to the racetrack vs. taking the ferry. The Seattle-Bremerton ferry ride is about an hour, and the Bremerton Ferry terminal is about 25 minutes from the racetrack.
Please check the Washington State Ferry Website for details.