Porsche 963 Given Weight Increase for Sebring

Photo: Brandon Badraoui/IMSA

The Rolex 24 at Daytona-winning Porsche 963 has been handed a weight increase ahead of next weekend’s Mobil 1 Twelve Hours of Sebring, which sees the Aston Martin Valkyrie as the biggest winner in terms of Balance of Performance.

Confirmed on Friday, the BoP table for the second round of the IMSA WeatherTech SportsCar Championship remains remarkably stable for the GTP class, with all four LMDh-based prototypes getting nearly identical reductions at both the first and second stage power levels.

The Porsche, Cadillac V-Series.R, BMW M Hybrid V8 and Acura ARX-06 will all face 1.9 percent power reductions at speeds below 230 km/h, while each getting a 1 percent less power at speeds over 240 km/h, except for the Cadillac, which gets a 0.9 percent reduction.

The outlier is the Aston Martin Valkyrie, which sees the LMH-based model return to a maximum power of 520 kW (+1.2 percent) and with no change to the V12-powered car’s second-stage levels.

Additionally, the Valkyrie remains at the base 1030 kg minimum weight, while all four LMDh models gain 10 kg, with the exception of the Porsche, which gets 20 kg of additional weight.

At 1055 kg, Porsche will head into the weekend as the heaviest car in the top class.

Every GT3 model, meanwhile, has received either weight and/or power adjustments for the second round of the WeatherTech Championship and Michelin Endurance Cup season.

Minimum and maximum rear wing angles have also been adjusted for every car.

The most sizable power changes come with the Rolex 24 GTD Pro-winning BMW M4 GT3 EVO, which gets a 4.4 percent reduction in first-stage power and a 3.5 percent cut in second stage.

Both the Ferrari 296 GT3 Evo and Ford Mustang GT3 EVO also 3 percent in the first stage, although the Prancing Horse is one of only three models that receives a marginal increase in the second stage, to the tune of 0.1 percent.

The Mustang GT3 EVO, meanwhile, gets a 2.8 percent decrease, compared to the Lexus RC F GT3, which gains 2.6 percent at the top-end.

The Porsche 911 GT3 R Evo, meanwhile, gets a slight 0.6 percent increase in second-stage power levels, as the only car running to 100 percent max power.

Ferrari is the heaviest hit in weight adjustments, with the 296 GT3 Evo getting 12 kg of additional weight, with both the Mustang GT3 EVO (-12 kg) and Aston Martin Vantage GT3 Evo (-13 kg) shedding considerable weight.

Chevrolet’s Corvette Z06 GT3.R, meanwhile, gets a 5 kg weight increase, with the Porsche having 6 kg of additional weight compared to the car’s configuration at Daytona.

The debuting Lamborghini Temerario GT3 will weigh in at 1351 kg and with 87.9 and 86.6 percent of the car’s maximum homologated power.

Compared to the Huracan GT3 EVO2, the Temerario GT3 is both lighter and with will have slightly more power.

John Dagys

John Dagys is the founder and Editor-in-Chief of Sportscar365. Dagys spent eight years as a motorsports correspondent for FOXSports.com and SPEED Channel and has contributed to numerous other motorsports publications worldwide. Contact John