On Monday, the GT Association (GTA), promoter and sanctioning body of the Autobacs Super GT Series, released the Balance of Performance (BoP) tables for the upcoming sixth round of the season, the Sugo GT 300km Race at Sportsland Sugo.
These changes include an update to the minimum weight of the GT500 class Honda NSX-GT.
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.
Positive changes such as boost increases and weight reductions will be highlighted in GREEN. Negative changes such as weight increases and boost reductions will be highlighted in RED.
For the upcoming Sugo GT 300km Race, all five Honda NSX GT3s will receive a minimum weight increase of 10 kilograms, from 1034kg to 1044kg.
In May 2017, on the eve of the Super GT in Kyushu 300km at Autopolis, the Hondas had their minimum weight reduced to 1034kg to the previous benchmark of 1049kg. Honda have won two races and three pole positions in 2018.
|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|
No changes from Rounds 1 through 5.
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||+50 kg|
After receiving a 30 kilogram weight reduction for the Fuji GT 500 Mile Race, the JAF-GT Mother Chassis cars all have those 30 kilograms put back on for Sugo, giving them a total of 50kg in BoP weight.
|Vehicle||Minimum Weight||BoP weight||Air restrictor||Notes|
|Nissan GT-R NISMO GT3 (2018)||1285 kg||+15 kg||None|
|BMW M6 GT3||1290 kg||+35 kg||None|
|Porsche 991 GT3-R||1225 kg||+30 kg||41.5 mm x 2|
|Honda NSX GT3||1240 kg||+50 kg||None|
|Lexus RC F GT3||1300 kg||+20 kg||38.0 mm x 2|
|Mercedes-AMG GT3||1285 kg||+50 kg||34.5 mm x 2|
|Lamborghini Huracán GT3||1230 kg||+55 kg||39.0 mm x 2|
|Audi R8 LMS GT3||1225 kg||+50 kg||39.0 mm x 2|
|Bentley Continental GT3||1300 kg||+10 kg||38.0 mm x 2|
|Nissan GT-R NISMO GT3 (2015)||1290 kg||+10 kg||40.0 mm x 2|
The Mercedes-AMG GT3 receives a 25 kilogram BoP weight increase for Sugo, the largest in the field of GT3 cars, most of which get weight increases.
The BMW M6 GT3, Honda NSX GT3, Audi R8 LMS GT3, and Bentley Continental GT3 all receive 10kg weight increases, and the Porsche 911 GT3-R and Lamborghini Huracán GT3 both receive 5kg weight increases.
Meanwhile, the 2018MY and 2015 Nissan GT-Rs all get 10 kilogram weight reductions, as does the Lexus RC F GT3
Maximum Boost Pressure
|SUBARU BRZ||NISSAN GT-R
|BMW M6 GT3|
|4000||1890 mbar||1780 mbar|
|4500||1880 mbar||1860 mbar|
|4750||4110 mbar||1880 mbar|
|5000||4040 mbar||1870 mbar||1910 mbar|
|5250||3850 mbar||1930 mbar|
|5500||3640 mbar||1850 mbar||1930 mbar|
|5750||3450 mbar||1930 mbar|
|6000||3230 mbar||1850 mbar||1900 mbar|
|6250||3060 mbar||1830 mbar|
|6500||2930 mbar||1810 mbar||1730 mbar|
|6750||2850 mbar||1660 mbar|
|>/ 7000||2700 mbar||1510 mbar||1650 mbar|
|>/ 7250||2530 mbar|
|>/ 7500||2390 mbar||–|
|FIA-GT3 2017||FIA-GT3 2016||FIA-GT3 2015|
|Boost Pressure [mbar]|
|4000||1870 mbar||2020 mbar||2020 mbar|
|4500||1870 mbar||2000 mbar||2000 mbar|
|5000||1980 mbar||1900 mbar||1970 mbar|
|5500||2020 mbar||1820 mbar||1940 mbar|
|6000||2040 mbar||1720 mbar||1930 mbar|
|6500||2060 mbar||1620 mbar||1910 mbar|
|>/ 7000||2040 mbar||1520 mbar||1890 mbar|
|>/ 7500||2000 mbar|
The 2018 Nissan GT-R gets a significant boost reduction throughout the powerband, down as much as 40 mbar from 4000-5500 RPM. In the middle of the BMW’s powerband, comes a 10 mbar reduction from 5000-5750 RPM, but a 20 mbar increase at 6000 RPM.
The Honda NSX GT3 gets a 20 mbar increase at 5000 RPM, the Bentley receives 10-20 mbar decreases from 5000-7000 RPM, and the 2015 Nissan GT-R gets a boost throughout the powerband. The Subaru’s boost potential remains unaltered.
Feature image courtesy of Honda