IMSA: Rolex 24 Balance of Performance tables released

............In GT Le Mans, no weight changes were made, and only one air restrictor change has been implemented. Corvette Racing's C7.Rs have smaller holes to feed air to its V8 engines, and lost a total of 0.4 mm from the twin restrictors, which now have 29.9 mm openings to breathe through. 

Turbocharged GTLM cars from BMW (sweeping boost reductions), Ferrari (sweeping boost reductions), and Ford (sweeping boost reductions) have had adjustments, except for peak RPM boost.

Fuel tank capacities and fuel flow restrictors for all five GTLM manufacturers have been set by IMSA for its big season-opening race. BMW's M6 (+9 liters to 104L, 33.5 mm), Corvette's C7.R (+6 liters to 92L, 32.0 mm), Ferrari's 488 (78L, 29.5 mm), Ford's GT (+3 liters to 98L, 35.0 mm), and Porsche's 911 RSR (+6 liters to 91L, 32.0 mm) represent the anticipated consumption and flow rates required to keep the cars on equal footing. BMW had the rear wing Gurney flap height increase (+10 mm to 15 mm total).............

IMSA Makes Significant BoP Changes for Rolex 24

By John Dagys

...........GT Le Mans:

***BMW M6 GTLM: Reduction in boost ratios, larger Gurney (5 to 15mm), larger fuel capacity (95 to 104 liters) and 33.5mm refueling restrictor

***Corvette C7.R: 0.2 mm smaller air restrictor (30.1 to 29.9mm), 6 liter increase in fuel capacity (86 to 92 liters) and 32mm refueling restrictor

***Ferrari 488 GTE: Slight reduction in boost ratios, confirmed 78 liters fuel capacity and 29.5mm refueling restrictor

***Ford GT: Reduction in boost ratios, 3 liter increase in fuel capacity (95 to 98 liters), 35mm refueling restrictor

***Porsche 911 RSR: 6 liter increase in fuel capacity (85 to 91 liters), 32mm refueling restrictor