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Felipe Nasr and Eric Curran stormed to victory for Action Express Racing in the Belle Isle IMSA race, out-strategizing Team Penske, but Acura got a major consolation prize with an NSX 1-2 in GT Daytona.
A red flag meant a truly strange ending to the IMSA Prototype qualifying session at Belle Isle in which Pipo Derani took pole, while Bryan Sellers was sensational in the GT Daytona class.
Helio Castroneves, an ace at Belle Isle in Indy cars, topped FP2 for the Detroit round of the IMSA WeatherTech SportsCar Championship, but incidents for a prime rival and a GTD car lost teams a lot of track time.
A sensational late lap from Ricky Taylor clinched top spot in the 90-minute opening IMSA practice session in Detroit, but the Action Express Cadillacs prevented an Acura 1-2.