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Balance of Performance (BoP) for Round 4 Twin Ring Motegi

GTA announced Balance of Performance (BoP) for each car to be applied for Round 4 of the 2021 AUTOBACS SUPER GT series, the “MOTEGI 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 2021 Round 2 at Fuji Speedway）

■GT500 Class

The re-fueling device flow restrictor (internal diameter: 25.0 mm) is 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	Notes
TOYOTA PRIUS #30	1200kg	29.67mm×2	+50kg	HYBRID Weight: None (not mounted)
TOYOTA PRIUS #31	1200kg	29.67mm×2	+20kg	HYBRID Weight: +51.0 kg
SUBARU BRZ	1150kg	None	+50kg	＊See chart below for boost pressure
TOYOTA SUPRA	1200kg	29.67mm ×2	+50kg

＊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: 27.5 mm) will not be used.

○GT300 Mother Chassis

Car	Minimum Weight	Air Restrictor		BoP Weight	Notes
TOYOTA 86 MC	1100kg	40.00mm x1	28.29mm x2	+70kg
LOTUS Evora MC	1100kg	40.00mm x1	28.29mm x2	+80kg	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	Air Restrictor	Notes
HONDA NSX GT3 EVO	1260kg	+55kg	None
Ferrari 488 GT3 2018	1260kg	+35kg	None
AUDI R8 LMS EVO	1235kg	+65kg	40mm x2
BMW M6 GT3	1290kg	+25kg	None
Lamborghini HURACAN GT3 2019	1230kg	+80kg	39mm x2
LEXUS RC F GT3	1300kg	+15kg	40mm x2
Mercedes-Benz AMG GT GT3	1285kg	+45kg	34.5mm x2	Lambda Min 0.91
NISSAN GT-R NISMO GT3	1285kg	+35kg	None
Porsche 991 GT3-R	1235kg	+35kg	41.5mm x2

○Maximum boost pressure

Engine rpm [rpm]	Boost pressure ratio @Lambda
	GT300	FIA-GT3
	SUBARU BRZ	Ferrari 488 GT3 （new entry car）	HONDA NSX GT3	NISSAN GT-R NISMO GT3	BMW M6 GT3
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			1.91 @0.92
5000	4.04 @0.92	1.55 @0.90	1.96 @0.88	1.92 @0.88	1.94 @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	1.87 @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	1.83 @0.88	1.93 @0.92
6250	3.06 @0.92	1.58 @0.90			1.90 @0.92
6500	2.93 @0.92	1.57 @0.90	2.00 @0.88	1.80 @0.88	1.75 @0.92
6750	2.85 @0.92	1.55 @0.90			1.66 @0.92
6900				1.78 @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 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.

Balance of Performance (BoP) for Round 4 Twin Ring Motegi

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