How IMSA Sorts Out Close Calls At the Finish Line Wild Mazda MX-5 Cup finishes has put IMSA timing and scoring to the test. By IMSA Wire Service IMSA In the very first Mazda MX-5 Cup race under IMSA sanction at Daytona International Speedway in January, the top seven finishers finished less than four-tenths of a second apart. The primary tool for deciding results comes from the electronic timing and scoring system. All competing cars carry a transponder, and every track has a series of timing loop wires embedded into the surface at various locations around the circuit, including the start/finish line.