Acura, Cadillac and BMW are amongst the manufacturers that have received BOP breaks for the upcoming IMSA round at Road America, while Lexus has seen its power reduced after a dominant weekend in the Cadillac Grand Prix of Sebring.
In the updated Balance of Performance bulletin, issued on Friday, the Acura ARX-05 and Cadillac DPi-VR have both seen their power levels increased.
The Acura has seen an increased boost ratio in the mid to high rev range, resulting in an increase of roughly 13 horsepower, while Cadillac’s 0.3mm restrictor diameter increase results in a gain of nearly 7 horsepower.
Acura and Mazda have both seen their minimum weight decreased by 10 and 20 kilograms respectively, while Cadillac and Mazda have seen their fuel capacity also decreased.
BMW gets a break
In GTLM, the BMW M8 GTE has seen both a reduction of minimum weight as well as increase in engine power. The car’s minimum weight has been reduced by 10 kilograms, while an increased boost ratio has seen the car’s power increased by 14 horsepower.
All GTLM cars have also all seen an increase in fuel capacity. The BMW gets an additional 12 litres, while the Corvette C8.R gets five litres and the Porsche 911 RSR-19 gets three additional litres.
GTD has seen fuel capacity increased across the board, while the Lexus and Ferrari have seen power reductions. The Lexus RC F GT3 was dominant at Daytona and Sebring, and has seen its restrictor diameter decreased by 1 millimeter, which results in a power reduction of over 9 horsepower, while the Ferrari 488 GT3 Evo has lost 6.8 horsepower.
The Audi R8 LMS GT3 Evo (13 horsepower) and Lamborghini Huracan GT3 Evo (12.6 horsepower) have both have their power increased.