Scott Dixon has been putting on a masterclass in passing this season. It’s also a scenario he and the No. 9 Chip Ganassi Racing team would love to solve.

With a packed entry list of at least 27 cars for each of its 17 races, the NTT IndyCar Series will try to give its drivers more time to complete the multi-round knockout road and street course qualifying sessions. But the new approach to managing the clock for each round...