A number of notable updates to IMSA’s Balance of Performance tables were revealed on Monday ahead of next month’s 12 Hours of Sebring, which serves as Round 2 for the TUDOR United SportsCar Championship.
High-downforce bodywork will be required for the entire Prototype class after one-off, low-downforce specifications were utilized at the high-speed Rolex 24 at Daytona season opener in January. The only vehicle adjustment in Prototype for Sebring will see Dinan BMW-powered Rileys lose 3 liters of fuel capacity. No changes are listed for the spec PC class.
Sweeping changes to GT Le Mans between Daytona and Sebring will see Aston Martin add 15kgs to its V8 Vantage, now 1190kg, and add a 15mm Gurney to the rear wing. AMR’s high downforce kit will also replace its low-drag Le Mans kit. BMW will remove 10kg from its Z4s, now 1220, and will add an additional 15mm of Gurney height to their rear wings, now up to 25mm.
The Rolex 24-winning Corvette C7.Rs will lose a bit of power with tighter air restrictors, as they decrease the opening size by 0.3mm to 29.8mm. The Corvettes will also add an additional 15mm of Gurney height to their rear wings, now up to 25mm. Ferrari’s F458 Italia will lose 1 liter of fuel capacity, down to 94L, and Porsche’s 911 RSRs will lose 4 liters, down to 98L.
GT Daytona has even more BoP changes than GTLM, starting with Aston Martin’s V12 Vantage gaining 20kgs, now 1265 kilos, add an additional 15mm of Gurney height to their rear wings, now up to 25mm, and lose 6 liters of fuel capacity, down to 98 liters. Audi’s R8 LMS also gains 20kg, up to 1330 kilos, and BMW’s Z4 gains 40kg, up to 1285 kilos, and has a big restrictor change coming as the 84mm orifice it breathed through at Daytona has been reduced by 19mm to 65mm.
The class-winning Dodge Vipers have received the most BoP changes for Sebring. They’ll gain 40kg, up to 1375 kilos, lose 200rpm, down to a maximum of 6300rpm, gain a half-inch of ride height, up to a minimum static ride height of 2.5 inches, gain 5mm of Gurney height on the rear wing, bringing it to 15mm, and lose 1 liter of fuel capacity, bringing it to 100 liters.
Ferrari’s F458 Italia gains 35kg, up to 1340 kilos, loses 250rpm with a new maximum of 8150rpm, and loses 4 liters of fuel tank capacity, bringing it down to 95L. Completing the GTD changes for Sebring, Porsche’s 911 GT America will add an additional 5mm of Gurney height to their rear wing, increasing the value to 25mm.