IMSA has confirmed the Balance of Performance for next weekend’s Rolex 24 at Daytona, with minimal changes having been made to the new-for-2017 Prototype class and wholesale adjustments for the GT Daytona contenders since the Roar Before the 24.
The sanctioning body issued the BoP to teams on Thursday evening, more than a day after a draft version was sent between manufacturers internally prior to official approval.
The Nissan Onroak DPi has been given an increase in boost ratio, across all power levels, while also gaining 5 liters in fuel capacity. While power levels were not adjusted for the Mazda RT24-P, it will have a 2 liters of additional fuel as well.
Aero adjustments, meanwhile, have been made for all cars except the Gibson-powered Ligier JS P217 and Oreca 07s. The changes mainly deal with the rear wings.
GT Le Mans competitors have also faced only minor adjustments, with the Ferrari 488 GTE car given a slight boost reduction and changes in the minimum rear wing angle for the BMW M6 GTLM, Ford GT and Porsche 911 RSR.
The BMW has lost 2 liters of fuel capacity, with both the Ferrari and Ford gaining 2 liters and the Porsche adding 1 liter.
The most changes have been made in the GT Daytona class, with every car except the BMW M6 GT3 having been adjusted in some form.
The Acura NSX GT3 has lost 20kg of minimum weight, plus an 8-liter increase in fuel capacity, while the Aston Martin V12 Vantage GT3 loses 10kg and gets a 0.8mm larger air restrictor.
Audi’s R8 LMS has been slowed with a 1.0mm air restrictor reduction, while the Ferrari 488 GT3 has been handed 10kg of additional weight but a slight increase in boost ratio, across all power levels.
Both the Lamborghini Huracan GT3 and Porsche 911 GT3 R will also have 1.0mm smaller air restrictors, with the Lexus RC F GT3 getting a 1.0mm increase, but with 10kg of additional weight.
The Mercedes-AMG GT3 will have a 1.5mm reduction in air restrictor for the race as well.
Prototype Challenge cars, meanwhile, have been given a 5-liter reduction in fuel capacity and a smaller refueling restrictor.