2018 Chang Super GT Race: BoP Tables

On May 30, the GT Association (GTA), promoter and sanctioning body of the Autobacs Super GT Series, released the Balance of Performance (BoP) tables for the upcoming fourth round of the season, the Chang Super GT Race at Chang International Circuit in Buriram, Thailand.

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.


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

No changes from Rounds 1 through 3.


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

No changes from Round 3.


FIA GT3

Vehicle Minimum Weight BoP weight Air restrictor Notes
Nissan GT-R NISMO GT3 (2018) 1285 kg +20 kg None
BMW M6 GT3 1290 kg +25 kg None
Porsche 991 GT3-R 1225 kg +30 kg 41.5 mm x 2
Honda NSX GT3 1240 kg +60 kg None
Lexus RC F GT3 1300 kg +25 kg 38.0 mm x 2
Mercedes-AMG GT3 1285 kg +40 kg 34.5 mm x 2
Lamborghini Huracán GT3 1230 kg +55 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

Very, very minor changes across the board.  Both the Lexus RC F GT3 and Mercedes AMG GT3 get a 10 kilogram weight increase from the last round at Suzuka.

The BMW M6 GT3 gets a 10 kilogram weight reduction, and there are 5 kilo weight reductions for both the Porsche 911 GT3-R and the Lamborghini Huracán GT3. All the other models remain unchanged.


Maximum Boost Pressure

JAF-GT300 FIA-GT3 2018
SUBARU BRZ NISSAN GT-R
NISMO GT3
BMW M6 GT3
Engine Speed
[rpm]
Boost Pressure[mbar]
4000 1930 mbar 1780 mbar
4250 1830 mbar
4500 1920 mbar 1860 mbar
4750 4110 mbar 1880 mbar
5000 4040 mbar 1900 mbar 1930 mbar
5250 3850 mbar 1930 mbar
5500 3640 mbar 1890 mbar 1930 mbar
5750 3450 mbar 1930 mbar
6000 3230 mbar 1850 mbar 1880 mbar
6250 3060 mbar 1830 mbar
6500 2930 mbar 1830 mbar 1730 mbar
6750 2850 mbar 1660 mbar
6900 1810 mbar
>/ 7000 2700 mbar 1510 mbar 1650 mbar
>/ 7250 2530 mbar
>/ 7500 2390 mbar
FIA-GT3 2017 FIA-GT3 2016 FIA-GT3 2015
HONDA
NSX GT3
Bentley
Continental GT3
NISSAN GT-R
NISMO GT3
Engine Speed
[rpm]
Boost Pressure [mbar]
4000 1870 mbar 2000 mbar 2020 mbar
4250
4500 1870 mbar 1900 mbar 2000 mbar
4750
5000 1980 mbar 1820 mbar 1970 mbar
5250
5500 2020 mbar 1760 mbar 1940 mbar
5750
6000 2040 mbar 1720 mbar 1930 mbar
6250
6500 2040 mbar 1630 mbar 1910 mbar
6750
6900
>/ 7000 2020 mbar 1530 mbar 1890 mbar
>/ 7250
>/ 7500 2000 mbar

Only very minor boosts of 20 mbar down for the BMW M6 GT3 at 6000-6250 rpm, and 20 mbar up for the Honda NSX GT3 at 5500-6000 rpm. All the other cars remain unaltered.

Feature image courtesy of Toyota

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