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2024.04.02
Requirements (BoP etc.,) for each car for Round 1 Okayama

Requirements (BoP etc.,) for each car for Round 1 Okayama の画像

GTA announced requirements (Balance of Performance (BoP), etc.,) for each car to be applied for the OKAYAMA GT 300km RACE, Round 1 of the 2024 AUTOBACS SUPER GT series. These requirements will be announced in a bulletin before each round of the series and competitors will have to prepare their cars accordingly.
Please note that the contents from the bulletin below are excerpts selected for ease of understanding and they should not be taken as the actual contents in the officially released bulletin. In case of a need for a precise interpretation, be sure to check the original bulletin.

（Blue underlines: Changes from the 2024 Official Test at Fuji）

 

 

 

■GT500 Class

A fuel flow restrictor with a capacity of 95.0kg/h must be fitted to each car, and a re-fueling device flow restrictor (internal diameter: 25.0 mm) is also applied.

 

 

■GT300 Class

The BoP regulations for the GT300 class FIA-GT3 cars have been decide based on consultations between GTA and SRO (organizers of IGTC, GTWC, etc.).

 

○GT300

Car Minimum Weight Air Restrictor BoP　Weight Additional Weight
(speed control measure)		 Car weight Notes
SUBARU BRZ 1200kg None +65kg +36kg 1301kg See attached chart for boost pressure
LEXUS LC500h 1250kg 29.67mm ×2 +90kg
(Including HYBRID weight)		 +38kg 1378kg  
TOYOTA SUPRA 1250kg 29.67mm ×2 +53kg +38kg 1341kg  
TOYOTA GR86 1250kg 29.67mm ×2 +53kg +38kg 1341kg  
NISSAN FAIRLADY Z 1250kg None +53kg +50kg 1353kg See attached chart for boost pressure

*A fuel supply restrictor device (internal diameter: 33.0mm) will be adopted in accordance with the 2024 JAF National Competition Vehicle Technical Regulations Chapter 3, Art. 10 10.3.2.

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

*A re-fueling device supply hose restrictor (internal diameter: 27.5 mm) must be adopted.

 

○GT300 Mother Chassis

Car Minimum Weight Air Restrictor BoP　Weight Additional Weight
(speed control measure)		 Car weight Notes
TOYOTA 86 MC 1100kg 40.00mm x1 28.29mm x2 +75kg +33kg 1208kg  

*A fuel supply restrictor device (internal diameter: 33.0mm) will be adopted in accordance with the 2024 JAF National Competition Vehicle Technical Regulations Chapter 3, Art. 10 10.3.2.

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

*A re-fueling device supply hose restrictor (internal diameter: 27.5 mm) must be adopted.

*The fuel capacity carried on-board is limited to 110 liters.

 

○FIA-GT3

Car Minimum Weight BoP　Weight Additional Weight
(speed control measure)		 Car weight Air Restrictor Notes
HONDA NSX GT3 2022 1260kg +60kg +51kg 1371 None  
Aston Martin AMR Vantage GT3 EVO 1265kg +40kg +51kg 1356 None  
BMW M4 GT3 1265kg +40kg +51kg 1356 None  
Ferrari 296 GT3 1275kg +45kg +51kg 1371 None  
Lamborghini HURACAN GT3 2019 1230kg +80kg +37kg 1347 39mm x2  
Lamborghini HURACAN GT3 EVO2 1250kg +70kg +38kg 1358 51mm x1  
Lexus RC F GT3 1300kg +0kg +39kg 1339 38mm x2  
Mercedes AMG GT3 2020 1285kg +45kg +39kg 1369 34.5mm x2 Lambda Min 0.91
Nissan GT-R NISMO GT3 1285kg +65kg +52kg 1402 None  
 

 

○Maximum boost pressure

  GT300 FIA-GT3
SUBARU BRZ Nissan
FAIRLADY Z		 HONDA
NSX GT3		 NISSAN GT-R
NISMO GT3		 BMW M4 GT3 Aston Martin
Vantage GT3 EVO		 Ferrari
296 GT3
Engine rpm
[rpm]
 Boost pressure ratio @Lambda
4000   1.88 @0.88 1.87 @0.88 1.90 @0.88 2.33 @1.10 1.56 @0.91 1.78 @0.90
4250         2.38 @1.10   2.06 @0.90
4500   1.85 @0.88 1.91 @0.88 1.87 @0.88 2.44 @1.10 1.66 @0.91 2.22 @0.90
4750 3.95 @0.92       2.47 @1.10   2.50 @0.90
5000 3.88 @0.92 1.81 @0.88 1.93 @0.88 1.83 @0.88 2.50 @1.10 1.73 @0.91 2.48 @0.90
5250 3.70 @0.92       2.55 @1.10   2.46 @0.90
5500 3.49 @0.92 1.75 @0.88 1.95 @0.88 1.77 @0.88 2.60 @1.10 1.75 @0.91 2.43 @0.90
5750 3.31 @0.92       2.63 @1.10   2.42 @0.90
6000 3.10 @0.92 1.72 @0.87 1.97 @0.88 1.74 @0.88 2.67 @1.10 1.78 @0.91 2.38 @0.90
6250 2.94 @0.92       2.71 @1.10   2.36 @0.90
6500 2.81 @0.92 1.69 @0.84 1.98 @0.88 1.71 @0.88 2.61 @1.10 1.76 @0.91 2.34 @0.90
6750 2.74 @0.92       2.51 @1.10   2.32 @0.90
6900   1.65 @0.83   1.67 @0.88      
>/ 7000 2.59 @0.92 1.49 @0.88 1.95 @0.88 1.51 @0.88 2.38 @1.10 1.73 @0.91 2.30 @0.90
>/ 7250 2.43 @0.92       2.23 @1.10 1.40 @0.91 2.28 @0.90
>/ 7500 2.27 @0.92   1.93 @0.88   2.10 @1.10   2.25 @0.90
8000     1.50 @0.88       2.10 @0.90
8100             1.00 @0.90

The maximum boost pressure level is calculated by applying the above boost pressure 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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