This weekend is the Roar Before the 24, a three-day test session held at the Daytona International Speedway in advance of the 2017 season opener, the Rolex 24 at Daytona, which runs January 28-29th.
IMSA issued its first Balance of Performance (BoP) tables to teams last week and further changes will be made once IMSA reviews the data following the Roar test.
The entire GTLM field including Corvette Racing will be participating in the Roar Before the 24 test.
In GTLM, the only new car in the ultra-competitive “manufacturers” class is the mid-engine Porsche 911 RSR. That car has been assigned a minimum weight of 1240 kg (2734 lbs). For the rest of the existing cars, the BMW M6 minimum weight is set at 1230 kg while the Corvette C7.R is 1240 kg, Ferrari 488 is 1250 kg and the Ford GTs are set at 1265 kg.
The Corvette C7.Rs have the best air-fuel ratio set at 0.88 while the Porsche is 0.89, Ford is at 0.90, the BMW is 0.96 and the leanest fuel supply goes to the Ferrari twin turbo V8s which is set at 1.10.
The Corvette C7.Rs and the Porsche 911 RSR both have restrictors on their naturally-aspirated engines. The Corvette C7.R has two 29.9 mm restrictors while the Porsche 911 has two 31.2 mm restrictors. The other turbo-charged GTLM race cars will have their own boost curves.
Finally, the C7.Rs will be running with 89 liters of fuel. Ferrari will have 84 liters, Ford GTs get 90 liters, the Porsche will get 92 liters and the BWM will start with 101 liters of fuel.
The full BoP tables from IMSA can be viewed here (PDF).
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