The GT Association (GTA), promoter and sanctioning body of the Autobacs Super GT Series, has released the Balance of Performance (BoP) tables for the opening round of the 2018 season, the Okayama GT 300km Race at Okayama International Circuit.

The Balance of Performance for the GT300 class is administered by the GTA in association with the Stéphane Ratel Organisation (SRO) for the FIA GT3 category cars, with all other BoP adjustments handled by the GTA.

In the GT500 class, the minimum vehicle weight remains unchanged from the end of the 2017 season, with the mid-engined Honda NSX-GT starting at 1034 kilograms compared to the front-engined Lexus LC500 and Nissan GT-R (1020 kg).

New to the official bulletins this year is distinction between different model years of FIA GT3 cars with regards to Balance of Performance adjustments such as weight and maximum turbo boost pressure.

On April 3rd, the 2018 Nissan GT-R NISMO GT3 received a boost increase throughout the power band.

JAF-GT300

Vehicle Minimum Weight Air restrictor BoP weight Notes Toyota Prius 1150 kg 28.70 mm x 2 + 0 kg Hybrid Weight: + 51 kg Subaru BRZ 1150 kg 45.00 mm x 1 + 0 kg

JAF-GT300 Mother Chassis

vehicle Minimum Weight Air restrictor BoP weight Notes Toyota 86 MC Lotus Evora MC Toyota Mark X MC 1100 kg 40.00 mm x 1 28.29 mm x 2 + 20 kg

FIA GT3

Vehicle Minimum Weight BoP weight Air restrictor Notes Nissan GT-R NISMO GT3 (2018) 1285 kg + 10 kg None Lexus RC F GT3 (2018) 1300 kg + 15 kg 38.0 mm x 2 BMW M6 GT3 (2018) 1290 kg +35 kg None Porsche 991 GT3-R (2018) 1225 kg +35 kg 41.5 mm x 2 Honda NSX GT3 1240 kg +60 kg None Lexus RC F GT3 (2017) 1300 kg + 20 kg 38.0 mm x 2 BMW M6 GT3 (2016) 1290 kg +30 kg none Mercedes-AMG GT3 1285 kg +30 kg 34.5 mm x 2 Porsche 991 GT3-R (2016) 1220 kg +35 kg 41.5 mm x 2 Lamborghini Huracán GT3 1230 kg +60 kg 39.0 mm x 2 Audi R8 LMS GT3 1225 kg + 45 kg 39.0 mm x 2 Bentley Continental GT3 1300 kg + 0 kg 38.0 mm x 2 Nissan GT-R NISMO GT3 (2015) 1290 kg +10 kg 40.0 mm x 2

Maximum Boost Pressure

JAF-GT300 FIA GT3 (2018) FIA GT3 (2017) Subaru BRZ Nissan GT-R NISMO GT3 BMW M6 GT3 Honda NSX GT3 Engine Speed (RPM) Maximum Boost Pressure (mBar) 4000 1930 mbar 1780 mbar 1870 mbar 4250 1830 mbar 4500 1920 mbar 1860 mbar 1870 mbar 4750 4110 mbar 1880 mbar 5000 4040 mbar 1900 mbar 1930 mbar 1960 mbar 5250 3850 mbar 1930 mbar 5500 3640 mbar 1890 mbar 1930 mbar 2000 mbar 5750 3450 mbar 1930 mbar 6000 3230 mbar 1850 mbar 1880 mbar 2020 mbar 6250 3060 mbar 1830 mbar 6500 2930 mbar 1830 mbar 1730 mbar 2040 mbar 6750 2850 mbar 1660 mbar 6900 1810 mbar > / 7000 2700 mbar 1510 mbar 1650 mbar 2020 mbar > / 7250 2530 mbar > / 7500 2390 mbar – 2000 mbar

FIA GT3 (2016) FIA GT3 (2015) BMW M6 GT3 Bentley

Continental GT3 Nissan GT-R

NISMO GT3 Engine Speed (RPM) Maximum Boost Pressure (mbar) Maximum Boost Pressure (mbar) 4000 1780 mbar 2000 mbar 2020 mbar 4250 1830 mbar 4500 1850 mbar 1900 mbar 2000 mbar 4750 1880 mbar 5000 1910 mbar 1800 mbar 1970 mbar 5250 1940 mbar 5500 1940 mbar 1750 mbar 1940 mbar 5750 1940 mbar 6000 1890 mbar 1690 mbar 1930 mbar 6250 1830 mbar 6500 1730 mbar 1590 mbar 1910 mbar 6750 1660 mbar 6900 > / 7000 1600 mbar 1530 mbar 1890 mbar > / 7250 > / 7500 –

Feature image courtesy of OTG Motor Sports