GT500 Class

GT500 Class

Definition and Core Status
The GT500 class is the premier racing category in Japan's Super GT championship, forming the series' dual-class multi-tier grid alongside the GT300 class. The GT500 moniker originated from its initial target output of around 500 hp; although current outputs have far exceeded this figure, the class name remains in use to this day. Long dominated by Japan's 'Big Three' carmakers—Toyota, Honda, and Nissan—the category serves as the core platform for Japanese manufacturers to showcase their pinnacle engineering prowess, widely acknowledged in motorsport as the "world's fastest touring car series".

Technical Specifications and Chassis Architecture
While GT500 race cars retain the exterior silhouette of showroom models, their underlying construction shares virtually no commonality with road-going production cars. The race machines are built around a standardised carbon-fibre monocoque tub manufactured by Toray, which is shared across Toyota, Honda, and Nissan. Body dimensions are strictly governed by technical regulations: an overall length of 4,725 mm, width of 1,950 mm, height of 1,150 mm, and a wheelbase of 2,750 mm, with a minimum weight of 1,020 kg and a front-engine, rear-wheel-drive (FR) layout. Crucial components such as the transmission, clutch, ECU, and fuel cell are also common-spec hardware across all three manufacturers.

Powertrain
GT500 race machines are powered by a 2.0-litre inline-four direct-injection single-turbocharged engine collectively known as the "NRE" (Nippon Race Engine), independently developed by each manufacturer within a strictly unified formula. These power units deliver in excess of 550 hp and over 50 kg·m of torque. From the 2026 season onwards, each car is restricted to just one engine for the entire season—a significant tightening from the previous two-engine quota—aimed at driving durability engineering and curbing racing costs.

2026 Season Technical Changes
The 2026 season marks a major turning point in GT500 technical regulations. With the aerodynamic development freeze concluded, manufacturers are permitted to introduce substantial aero revisions. Honda has replaced the outgoing Civic Type R-GT with the all-new HRC Prelude GT, focusing on increasing downforce to elevate cornering performance; Toyota and Nissan have updated key aero components on the GR Supra GT500 and Z NISMO GT500 respectively, including front fender louvres, side skirt ducting, and wing mirrors. On the fuel front, the championship has transitioned from synthetic carbon-neutral fuel to a domestically produced E10 blend co-developed with ENEOS. Furthermore, the success ballast system now introduces a "success refuelling restrictor"; when ballast exceeds 50 kg, the car's performance is additionally handicapped by narrowing the fuel filler nozzle diameter alongside fuel flow restrictor adjustments.

2026 Season Grid and Competitive Landscape
A total of 14 cars will contest the GT500 class for the 2026 season, reduced by one entry following a consolidation in the Nissan camp. Toyota fields the largest presence on the grid with six GR Supra GT500 entries; Honda campaigns four HRC Prelude GT cars run by frontline squads including ARTA MUGEN and Team Kunimitsu; Nissan fields three Z NISMO GT500 challengers spearheaded by TEAM IMPUL, NISMO, and KONDO RACING. Defending champions Sho Tsuboi and Kenta Yamashita return behind the wheel of the No. 36 au TOM'S GR Supra GT500, setting a blistering pace for their title defence right from the season-opening round at Okayama.