IMSA revises Balance of Performance process for GTD

IMSA has released the Balance of Performance tables for the Mobil 1 Twelve Hours of Sebring, and compared to the configurations for the Rolex 24 at Daytona, the tables for Sebring include changes to every car in the GTP and GTD fields. The Sebring BoP tables are the result of a revised process after a new method of determining BoP for the GTD PRO and GTD classes was attempted at Daytona.

To better adjust new cars, and also to have a better Balance of Performance as the GTD cars switched to a new Michelin tire, IMSA conducted tests following the IMSA-sanctioned test at Daytona International Speedway in December. Working with the manufacturers, a representative car from each OEM was observed in a set of specific exercises to determine the BoP for the Rolex 24 at Daytona. However, Daytona being a unique circuit among IMSA WeatherTech SportsCar Championship tracks, and without the opportunity to conduct a similar test at Sebring or elsewhere, the decision was made for IMSA to take more control of the BoP process going forward.

“We’ve looked at some of what happened in the race, we looked at some of the data on the new tires from the race, and we’ve then worked with the OEMs on further evolution of the Balance of Performance process going into Sebring,” explained Matt Kurdock, IMSA’s senior technical director. “So we were able to leverage not only data from some select events in 2023, on cars that have returning year over year, but really have relied on data from the 24 hours of racing on the new Pilot Sport Pro tire, and particularly with the three new car models – the Corvette, the Mustang, and the Aston Martin Evo.

“We concluded a technical working group yesterday with the OEMs, discussing the process, discussing the performance targets for Sebring, and the OEMs felt that carrying on in a manner where working towards the common performance targets would prove to be difficult, particularly as there is no opportunity to conduct a Sebring sanctioned test. So what we’ve done is IMSA has taken some of the 2023 data in combination with some of the Rolex 24 data, and has since devised a BoP solution for Sebring that basically is a combination of those sources of data available with trying to hit a common performance target for the GTD and GTD PRO classes for the Sebring event.”