The factory Porsche 911 RSR-19s will be carrying additional weight in next weekend’s TireRack Grand Prix at Michelin Raceway Road Atlanta, as one of several Balance of Performance adjustments confirmed by IMSA.
The pair of GT Le Mans class entries, which have yet to win a race this year in the WeatherTech SportsCar Championship, have been handed a 20kg increase in minimum weight for the six-hour Michelin Endurance Cup round.
The cars will now weigh in at 1320kg, as the heaviest GTLM machine by 40kg.
While no other changes have been made to the GTLM class since last weekend’s Michelin GT Challenge at VIR, the GT Daytona class will see a power increase for the Aston Martin Vantage GT3, in the range of 9.5 horsepower.
It will also come with a 2-liter increase in fuel capacity to compensate for the additional power.
The Lamborghini Huracan GT3 Evo, meanwhile, has been given a 2-liter reduction in fuel capacity, coming in the wake of Paul Miller Racing’s post-race technical infraction for having exceeded the 105-liter fuel capacity at the time.
No changes have been made to the DPi or LMP2 classes, which rejoin the GT ranks for the Sept. 5 enduro.