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2021.03.30
Balance of Performance (BoP) for Round 1 Okayama

Balance of Performance (BoP) for Round 1 Okayama の画像

GTA announced Balance of Performance (BoP) for each car to be applied for Round 1 of the 2021 AUTOBACS SUPER GT series, the “Takanokono Hotel OKAYAMA GT 300km RACE”.
Please note that the contents from the bulletin below are excerpts selected for ease of understanding and they should not be taken as the actually released official bulletin. In case of a need for a precise interpretation, be sure to check the original bulletin.

（Blue underlines：Changes from the 2020 Round 8 at Fuji Speedway）

 

 

 

■GT500 Class

The fuel flow restrictor set at 90.2kg/h and the re-fueling device flow restrictor (internal diameter: 25.0 mm) are the same as those of the previous specifications.

 

 

■GT300 Class

The BoP regulations for the GT300 class FIA GT3 cars have been decide based on consultations between GTA and SRO (organizers of GT3 World Challenge Powered by AWS, etc.).

 

○GT300

Car Minimum Weight Air Restrictor BoP Weight Special BoP Weight Notes
TOYOTA PRIUS #30 1200kg 29.67mm×2 +50kg +36kg HYBRID Weight：None (not mounted)
TOYOTA PRIUS #31 1200kg 29.67mm×2 +20kg +36kg HYBRID Weight：+51.0kg
SUBARU BRZ 1150kg None +50kg +35kg ＊See chart below for boost pressure
TOYOTA SUPRA 1200kg 29.67mm ×2 +50kg +36kg  
 

* Minimum ground clearance: a 15 mm spacer shall be fitted between the reference plane and the skid block with a thickness of 10mm (±2mm).

 

○GT300 Mother Chassis

Car Minimum Weight Air Restrictor BoP Weight Special BoP Weight Notes
TOYOTA 86 MC 1100kg 40.00mm x1 28.29mm x2 +70kg +33kg  
LOTUS Evora MC 1100kg 40.00mm x1 28.29mm x2 +80kg +33kg BoP Weight of 10 kg is positioned as designated by GTA

* Minimum ground clearance: a 15 mm spacer shall be fitted between the reference plane and the skid block with a thickness of 10mm (±2mm).

＊A re-fueling device flow restrictor (internal diameter: 31.2 mm) will be adopted.

 

○FIA-GT3

Car Minimum Weight BoP Weight Special BoP Weight Air Restrictor Notes
HONDA NSX GT3 EVO 1260kg +50kg +51kg None  
Ferrari 488 GT3 2018（new entry car） 1260kg +40kg +51kg None  
AUDI R8 LMS EVO 1235kg +75kg +38kg 40mm x2  
BMW M6 GT3 1290kg +20kg +52kg None  
Lamborghini HURACAN GT3 2019 1230kg +95kg +37kg 39mm x2  
LEXUS RC F GT3 1300kg +30kg +39kg 40mm x2  
Mercedes-Benz AMG GT GT3 1285kg +50kg +39kg 34.5mm x2 Lambda Min 0.93
NISSAN GT-R NISMO GT3 1285kg +35kg +52kg None  
Porsche 991 GT3-R 1235kg +45kg +38kg 41.5mm x2  
 

 

○Maximum boost pressure

  GT300 FIA-GT3
SUBARU BRZ Ferrari 488 GT3
（new entry car）		 HONDA
NSX GT3		 NISSAN GT-R
NISMO GT3		 BMW M6
GT3
Engine rpm
[rpm]
 Boost pressure ratio @Lambda
4000   1.47 @0.90 1.87 @0.88 1.94 @0.88 1.78 @0.92
4250   1.49 @0.90     1.83 @0.92
4500   1.51 @0.90 1.93 @0.88 1.93 @0.88 1.86 @0.92
4750 4.11 @0.92 1.53 @0.90     1.89 @0.92
5000 4.04 @0.92 1.55 @0.90 1.95 @0.88 1.92 @0.88 1.93 @0.92
5250 3.85 @0.92 1.57 @0.90     1.96 @0.92
5500 3.64 @0.92 1.59 @0.90 1.97 @0.88 1.865 @0.88 1.98 @0.92
5750 3.45 @0.92 1.60 @0.90     1.96 @0.92
6000 3.23 @0.92 1.59 @0.90 1.99 @0.88 1.825 @0.88 1.90 @0.92
6250 3.06 @0.92 1.58 @0.90     1.87 @0.92
6500 2.93 @0.92 1.57 @0.90 2.00 @0.88 1.795 @0.88 1.73 @0.92
6750 2.85 @0.92 1.55 @0.90     1.66 @0.92
6900       1.775 @0.88  
>/ 7000 2.70 @0.92 1.54 @0.90 1.98 @0.88 1.51 @0.88 1.62 @0.92
>/ 7250 2.53 @0.92 1.49 @0.90      
>/ 7500 2.39 @0.92 1.47 @0.90 1.94 @0.88    
8000   1.30 @0.90 1.50 @0.88    
8100          

The above boost pressure has a boost pressure ratio, and the pressure level is calculated by applying that ratio to the standard air pressure announced by GTA.
At each race event, the teams must adjust the maximum boost pressure in accordance with the local air pressure announced by GTA.
 

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