Overview

• The GT World Challenge America grid dropped to 15 cars at Road America after LAB Motorsport’s No. 92 Porsche no-showed following crashes at VIR.
• All GT3 and GT4 entries began their North American competition on Pirelli’s P Zero DHG tyre, marking the compound’s first race outing outside Europe.
• SRO America maintained 26kg of ballast on Justin Rothberg’s Turner Motorsport BMW and added a five-place GT America grid penalty plus a five-second pit-stop time penalty in GT World Challenge races.
• A Balance of Performance adjustment now allows the Chevrolet Corvette Z06 GT3.R to run a reduced 6.6-degree rear wing angle to boost its straight-line speed.
• Regulator Racing’s Philip Ellis topped Thursday’s test session at Road America with a 2:04.678 lap in the No. 91 Mercedes-AMG GT3 Evo.