IMSA released late Friday the latest Balance of Performance adjustments ahead of next week’s TUDOR United SportsCar Championship Winter Test at Sebring International Raceway.
Changes have been made in all four categories but primarily in the production-based GT ranks.
The GTLM class sees a 15kg weight increase for both the BMW Z4 GTE and SRT Viper GTS-R cars, while also a 0.3mm reduction in the diameter of the Viper’s air restrictor.
Aston Martin’s Vantage V8, meanwhile, has been given a 20kg weight reduction and a 0.3mm increase in air restrictor size.
Fuel capacity has been reduced class-wide, with the Vantage now carrying the least amount at 87 liters, while the Viper will be allowed to run at 105 liters. The Ferrari F458 Italia has seen a significant reduction to 94 liters.
In GTD, both the Ferrari 458 Italia GT3 and Audi R8 LMS cars have been handed a 20kg weight increase, while the Rolex 24 class-winning Prancing Horse will have a 5mm smaller air restrictor, compared to the Audi’s 2mm reduction.
Rear wing heights and placements have been equalized, while the fuel capacity has also been reduced for all competitors, the Porsche 911 GT America taking the biggest hit with a 17-liter reduction.
Additionally, the SRT Viper GT3-R will be allowed to run a 20mm Gurney instead of the 10mm allowed at Daytona.
The full extent of adjustments in the Prototype class have yet to be revealed, with the air restrictor sizes for the DP engines in the latest technical bulletin not yet defined.
The P2 cars, however, remain unchanged from Daytona, aside from a 3-liter increase in fuel capacity.
Finally, the spec Prototype Challenge class will see the elimination of the mandated rear wing position, which had reduced the car’s top speed around the Florida high banks.
IMSA’s VP of Competition and Technical Regulations, Scot Elkins, told Sportscar365 last month that he hopes for these latest round of adjustments to also be in place for next month’s Twelve Hours of Sebring.