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Corvette, BMW Hit With BoP Changes Ahead of Long Beach

Corvette C8.R GTD hit with weight increase, power reduction for Long Beach…

Photo: Chris duMond/IMSA

The Chevrolet Corvette C8.R GTD and BMW M4 GT3 are among the GTD spec cars hit with Balance of Performance adjustments ahead of next weekend’s Acura Grand Prix of Long Beach.

Confirmed in the latest technical bulletin from IMSA, the Mobil 1 Twelve Hours of Sebring GTD Pro class-winning Corvette has been given 10 kg of additional weight, a 0.4 mm smaller air restrictor — equating to an 8.3 horsepower decrease — as well as a 4 liter reduction in fuel capacity.

The Corvette is now running with a total of 50 kg of ballast compared to its previous specification in the GT Le Mans class.

The new-for-2022 BMW, meanwhile, will have a 17-horsepower reduction but slightly offset with a 20-kg reduced minimum weight and 8-liter fuel capacity reduction to coincide with the power cut.

Other changes in GTD Pro and GTD include a 2 mm larger air restrictor for the Porsche 911 GT3 R, which is roughly a 5 horsepower increase, while the Acura NSX GT3 Evo22 gets a turbo boost in the range of 8.3 horsepower.

Additionally, the McLaren 720S GT3 has been given a 15 kg reduction in minimum weight.

Fuel capacity adjustments have also been made for the Acura, Porsche and McLarens in the production-based ranks.

The DPi class also sees a BoP change with the Acura ARX-05 getting a 10 kg minimum weight reduction, bringing it down to 920 kg, compared to the Cadillac DPi-V.R, which remains at 945 kg.

It marks the first change in the top class since last year.

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

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