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IMSA Releases GTP BoP for Roar

All four LMDh models begin on nearly equal Balance of Performance ahead of next weekend’s Roar Before the Rolex 24…

Photo: Mike Levitt/IMSA

IMSA has released the initial Balance of Performance table for the GTP era, confirming the technical configurations for all four LMDh models that will take part in next weekend’s Roar Before the Rolex 24.

Issued on Thursday, the table has defined a car’s minimum weight, engine power, maximum rpm, maximum stint length energy and stint energy replacement rate as part of the new BoP process undertaken by the sanctioning body.

All four LMDh models will weigh in at 1030 kg and run to the same maximum stint energy (combined between R80 fuel and electric power) and stint energy replenishment rate (refueling time).

Additionally, the maximum power output has been confirmed at 500 kW (670 horsepower), although there are variations between the cars at certain engine speeds.

The Acura ARX-06, featuring a 2.4-liter twin-turbocharged engine, will be the highest revving at 9512 rpm, with the 4.0-liter BMW V8 turbo the lowest at 8000 rpm. The Porsche 963 will have a 8158 rpm limit, while the Cadillac V-LMDh pegged at 8800 rpm.

The BoP’s determination came following each cars’ homologation as well as the recent IMSA-sanctioned test at Daytona International Speedway where data was gathered on the new-for-2023 prototype platform.

IMSA holds the right to make adjustments to the BoP prior to the WeatherTech SportsCar Championship season-opening Rolex 24 at Daytona.

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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