IMSA has made significant changes to the Balance of Performance tables that adjust the competitive abilities of each chassis in the TUDOR United SportsCar Championship’s GT Daytona class for next week’s event at Mazda Raceway Laguna Seca.
All six manufacturers with cars in the GTD class have received adjustments to the weight, engine air restrictor, engine RPM, aerodynamics, fuel tank capacity, or refueling tank flow rates ahead of the Continental Tire Monterey Grand Prix Powered By Mazda. Furthermore, the changes have been made under IMSA’s new approach to BoP alterations where a panel, led by IMSA technical boss Geoff Carter, which now includes the manufacturers, arrives at the final specifications for each chassis. The previous process, by comparison, was far less inclusive and was conducted without direct manufacturer input.
Aston Martin’s V12 Vantage will lose 10 kilos, dropping its minimum weight to 1255kgs. It will also lose 2 liters of tank capacity, racing with a maximum of 96 liters of fuel.
Audi’s challenged R8 LMS will lose 25 kilos, dropping its minimum weight to 1305kgs. Its V10 engine will breathe easier thanks to a total 4.6mm increase of airflow through its twin restrictors. It will also gain 7 liters of tank capacity, racing with a maximum of 110 liters of fuel.
BMW’s struggling Z4 will lose 25 kilos, dropping its minimum weight to 1260kgs. Its V8 engine will breathe much easier thanks to a 19mm increase of airflow through its single restrictor. The use of dual dive planes will also be permitted.
Dodge’s rapid Viper will gain 30 kilos, raising its minimum weight to 1405kgs.
Ferrari’s flagging F458 Italia has received the highest volume of BoP adjustments. The Italian coupe will lose 20 kilos, dropping its minimum weight to 1320kgs, and gain 150RPMs, raising the redline to 8300. Fuel capacity moves up 5L to 100 liters, and its refueling will take less time, thanks to a 1mm improvement in flow restriction.
Porsche’s 911 GT America will lose airflow to its flat-6 engine by 10.5mm through its lone restrictor.
Practice for Round 4 of the TUDOR Championship starts Friday, May 1.