Multiple GT Cars Hit With BoP Changes for Indy

Photo: Jake Galstad/IMSA

Multiple GT cars, including the GTD Pro and GTD class championship-leading entries, have been hit with Balance of Performance adjustments ahead of next weekend’s Battle on the Bricks at Indianapolis Motor Speedway.

Released in a technical bulletin on Thursday, IMSA has confirmed power reductions for the BMW M4 GT3, Lexus RC F GT3, and Chevrolet Corvette C8.R GTD.

The BMW, which currently leads the GTD standings with Paul Miller Racing, has received a power cut in the range of 6 horsepower, roughly the same as the Corvette, while the Lexus has been the hardest hit with an 8 hp reduction.

While the McLaren 720S GT3 Evo gets a 20 kg increase in minimum weight, the Mercedes-AMG GT3 Evo has received a 30 kg break and the Type-992 Porsche 911 GT3 R at a 10 kg increase but offset with a larger air restrictor for the second consecutive race.

Fuel capacity adjustments have been made to all of the adjusted cars except for the Mercedes, meanwhile.

IMSA has also declared the BoP for the final two races of the season for the GTP class, with separate tables for Indianapolis and Michelin Raceway Road Atlanta released.

As has been the case all season, only minor tweaks have been made to the four LMDh manufacturers.

The Acura ARX-06 has been given a 3 kg increase in minimum weight for Indy to bring it up to 1047 kg, although it will shed 1 kg for Motul Petit Le Mans, with the BMW M Hybrid V8 set at 1031 kg for the final two races.

Cadillac’s V-Series.R remains at 1030 kg for the championship stretch, with the Porsche 963 getting a 1 kg increase since Road America, and will now run at 1037 kg.

Power levels, meanwhile, have fluctuated by no more than 1 kW (1.3 hp) across the four cars.

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