The IMSA WeatherTech SportsCar Championship’s visit to the streets of Long Beach this year features 19 cars across two classes, but the small number of entries weren’t able to escape Balance of Performance adjustments ahead of the season’s first sprint race.
The DPi class will hit the 1.986-mile temporary circuit with changes to each of the four prototypes. Acura’s ARX-05 will benefit from a minimum weight reduction of 20 kilograms and a boost pressure increase at the upper end of its rev range.
An average power delta increase of 9 kilowatts is balanced by a 5-liter fuel capacity reduction for the ORECA-based, Team Penske-run Acura DPi.
While the minimum weight and fuel capacity of the Ligier Nissan DPi didn’t change, its turbo boost was significantly increased, leading to a 12.5 kW increase in average power delta. Mazda’s RT24P was adjusted in the opposite direction, losing boost pressure and fuel capacity for a 9.4 kW decrease in average power delta.
Cadillac’s dominant DPi-V.R will enter the Long Beach weekend with no change in power output. Instead, it will contend with 10 kg of additional weight and 4 L less fuel.
In GT Le Mans, only two cars will be altered from their Sebring configurations. The pair of Ford GTs fielded by Chip Ganassi Racing will race with decreased boost pressure across the rev range, contributing to a 5.3 kW average power delta drop. The Fords will also carry 1 L less fuel.
Changes for the Porsche 911 RSR were mixed with a 10 kg decrease in minimum weight offset by 2 L less fuel capacity.
Both classes will hit the track for practice and qualifying April 12 in advance of the 100-minute race April 13.