2018 Motegi GT 250km Grand Final: BoP Tables

On Tuesday, the GT Association (GTA), promoter and sanctioning body of the Autobacs Super GT Series, released the Balance of Performance (BoP) tables for the upcoming eighth and final round of the season, the Motegi GT 250km Race Grand Final.

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.


GT500

All five Honda NSX-GT500s remain at 1044kg of minimum weight. This may very well be the last race for the mid-engined platform before Honda switches to a front-engined layout with the NSX silhouette, perhaps as early as 2019.


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

JAF-GT300 Balance of Performance remained unchanged all season long! Hooray!


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 the last two rounds at Sugo and Autopolis.


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 +25 kg 41.5 mm x 2
Honda NSX GT3 1240 kg +40 kg None
Lexus RC F GT3 1300 kg +30 kg 38.0 mm x 2
Mercedes-AMG GT3 1285 kg +40 kg 34.5 mm x 2
Lamborghini Huracán GT3 1230 kg +50 kg 39.0 mm x 2
Audi R8 LMS GT3 1225 kg +45 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

After remaining unchanged from Sugo to Autopolis, these parameters get some updates for Motegi.

The Lexus RC F GT3s receive a 10 kilogram weight increase, and the Nissan GT-R NISMO GT3 (MY2018) gets a 5kg weight increase.

Getting 10 kilogram weight reductions are the BMW M6 GT3, Mercedes-AMG GT3, and the Honda NSX GT3. The three VW-Audi Group cars (Audi R8 LMS GT3, Lamborghini Huracán GT3, Porsche 911 GT3-R) get 5 kilogram weight reductions.

The MY2015 Nissan GT-R and the Bentley Continental remain unchanged from Rounds 6 and 7.


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 1810 mbar 1730 mbar
6750 2850 mbar 1660 mbar
6900 1790 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 2060 mbar 1630 mbar 1910 mbar
6750
6900
>/ 7000 2040 mbar 1530 mbar 1890 mbar
>/ 7250
>/ 7500 2000 mbar

The 2018 Nissan GT-R NISMO GT3 gets a big boost increase, up 30-40 mbar in boost pressure at the mid-range of its powerband (4000-5500 RPM). Whereas the Bentley Continental GT3 gets a huge reduction in boost pressure in the mid-range (4000-5500 RPM), but a slight boost at the top (6500-7000 RPM).

The BMW M6 GT3 gets a bit of a boost increase at 5000 RPM, and a drop at 6000 RPM. From rounds 6 and 7, the boost on the Subaru BRZ R&D Sport, Honda NSX GT3, and 2015 Nissan GT-R remains intact.

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