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IMSA released on Friday the initial of balance of performance for next weekend’s Roar Before the 24 test, setting the stage for the 2018 WeatherTech SportsCar Championship procedures.
The first BOP arrives after extensive testing and analysis following the recent Daytona International Speedway IMSA open tests. According to an analysis by SportsCar 365, the GT Le Mans and GT Daytona classes remain relatively unchanged compared to the end-of-season BOP.
However, several adjustments have been made to several Prototype teams. Via SportsCar 365:
The Cadillac DPi.V-R, which features a smaller 5.5-liter V8 engine, has seen the biggest change, with a 10 kg minimum weight increase along with a 1.8 mm (x2) larger air restrictor.
Wayne Taylor Racing took part in the recent IMSA-sanctioned test with the updated powerplant, which was sent to NASCAR’s RD facility in Concord N.C. for further evaluation.
Both the Nissan Onroak DPi and the new-for-2018 Acura ARX-05 will also now run at 940 kg, compared to 930 kg for the LMP2-spec machinery and the Mazda RT24-P.
No power-related adjustments have been made to either of the turbocharged Nissan and Mazda powerplants, although IMSA has implemented aero-related changes for some P class cars.
Initial performance levels for both the Acura DPi and BMW M8 GTE, the two all-new cars for next year, have been established, with the BMW running at a 1,250 kg minimum weight and with a revised turbo boost curve than its M6 GTLM predecessor.
These adjustments are not final and are subject to revision following next weekend’s Roar test sessions. The complete BOP can be viewed below.