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IMSA Sets Roar BoP; Wholesale Adjustments in GT Classes

Changes to 11 of 12 GT models compared to last year’s Rolex 24 Balance of Performance…

Photo: Barry Cantrell/IMSA

IMSA has established the Balance of Performance for next weekend’s Roar Before the Rolex 24.

Issued in a technical bulletin sent to teams on Thursday, the baseline BoP for Daytona sees a number of changes compared to last year’s tables for the Rolex 24, most notably in the production-based GT Le Mans and GT Daytona classes.

The two-time and defending GTLM class-winning BMW M8 GTEs will be 10 kg heavier and are set to run at a reduced turbo boost level for the Roar, while the Ferrari 488 GTE Evo has received an increase in boost pressures.

Both the Chevrolet Corvette C8.R and Porsche 911 RSR-19, meanwhile, have been given 0.3 mm increases in its naturally aspirated air restrictors, which will produce more power, although the Corvette has been handed a 10 kg weight addition. 

Seven of the eight GT3 models have received performance adjustments in GTD, headlined by a 20 kg increase in minimum weight and 3 mm reduction in air restrictor for the Porsche 911 GT3 R.

The 2020 class-winning Lamborghini Huracan GT3 Evo will have reduced power levels as will the Audi R8 LMS GT3 Evo, which has in addition received a 10 kg weight increase.

Both the Ferrari 488 GT3 Evo 2020 and Acura NSX GT3 Evo have received 5 kg weight breaks and increases in boost pressures, with the Lexus RC F GT3 and BMW M6 GT3 handed 5 kg of additional weight and the BMW losing boost pressures as well.

Aston Martin’s Vantage GT3, meanwhile, has received a 20 kg break in minimum weight, with the Mercedes-AMG GT3 Evo unchanged in weight and power compared to last year’s Rolex 24.

The only adjustment in DPi has come with a 10 kg increase in minimum weight for the Cadillac DPi-V.R, while all LMP2 cars have received an increase in maximum RPM levels, from 8250 to 8700 RPM.

The change should put the LMP2 machinery closer to DPis in terms of top speed and potentially lap times as well.

As has been the case in recent years, IMSA utilizes a standalone BoP system for Daytona due to the track’s unique characteristics.

It’s understood BoP changes could be made following the Roar in the build-up to the Rolex 24 on Jan. 30-31.

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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