Asian Le Mans - 4H of Sepang 1

The 4H of Sepang 1 marks the opening round of the Asian Le Mans Series season at Sepang International Circuit in Malaysia. This endurance race brings together sports car competitors from around the globe to compete at one of Asia's premier racing venues. The event features two separate 4-hour races held over consecutive days, with both contests serving as championship rounds in the aslms calendar.

Asian Le Mans Series Competition

The 4H of Sepang 1 serves as a crucial season opener for the aslms championship. Teams compete across three distinct categories: LMP2, LMP3, and LMGT3. The stakes are high for competitors, as the championship-winning teams in both the LMP2 and GT categories earn an invitation to compete at the 24 Hours of Le Mans. This connection to endurance racing's most famous event adds significant value to the aslms series competition.

Sepang International Circuit Details

Sepang International Circuit measures 5.543 kilometers in length and features 15 turns that test driver skill and car performance. Hermann Tilke designed the circuit, which opened in 1999. The track sits approximately 45 kilometers south of Kuala Lumpur, near Kuala Lumpur International Airport. The venue can accommodate roughly 130,000 spectators.

Track Characteristics

The circuit layout includes sweeping corners and wide straights that measure between 16 and 22 meters across. A 0.927-kilometer back straight connects to the pit straight through a tight hairpin. The track surface uses a special bitumen compound suited to the Malaysian climate. This surface creates high tire degradation during races, and track temperatures can reach 60 degrees Celsius. These conditions challenge teams to manage tire wear and car setup throughout each 4-hour race.

Participating Teams and Drivers

The 2025 edition of the 4H of Sepang 1 featured a 48-car field. The entry list consisted of 16 LMP2 entries, 10 LMP3 entries, and 22 LMGT3 entries. The event attracted 144 drivers representing 35 teams from 35 different nationalities.

LMP2 Class

The LMP2 category included established teams such as Algarve Pro Racing, United Autosports, Proton Competition, Cetilar Racing, and Ponos Racing. All LMP2 cars use the Gibson GK428 V8 engine and compete on Michelin tires, creating a level playing field where team strategy and driver performance determine results.

LMGT3 Category

The GT category showcased diverse manufacturer representation. Aston Martin, BMW, Corvette, Ferrari, McLaren, Mercedes, and Porsche all fielded entries at Sepang International Circuit. This manufacturer variety creates close competition and demonstrates the global appeal of the aslms series.

Technical Specifications

The 2025 season marks an important technical milestone for the aslms series. The third-generation LMP3 cars made their debut at this event. These new machines use 3.5-liter twin-turbo V6 Toyota engines, representing the latest evolution in prototype racing technology. The updated specifications provide teams with modern equipment while maintaining the cost-effective nature of the LMP3 category.

Event History

Sepang International Circuit joined the Asian Le Mans Series calendar in 2013. The race initially ran as a 3-hour event before expanding to a 4-hour format in 2017. The COVID-19 pandemic prevented the race from taking place in 2021 and 2022. The event returned in 2023 with a new format featuring two 4-hour races held on consecutive days. This double-header format provides more track action and doubles the championship points available at this venue.

What Makes This Event Notable

The 4H of Sepang 1 combines several elements that make it significant for sports car racing fans. The hot and humid Malaysian climate tests both car reliability and driver endurance over each 4-hour race. The track layout at Sepang International Circuit rewards both aerodynamic efficiency on the long straights and mechanical grip through the technical corners. The multi-class racing format creates strategic complexity as faster prototype cars navigate through GT traffic.

The connection between aslms championship success and Le Mans entry gives every position in the championship standings real consequence. Teams must balance performance across both races at Sepang International Circuit while protecting their equipment for the remainder of the season. The debut of the new-generation LMP3 cars adds technical interest as teams learn to optimize these updated machines.

The diversity of the entry list brings together competitors from multiple continents, reflecting the international scope of the Asian Le Mans Series. This global participation ensures high-quality competition across all three racing categories at the 4H of Sepang 1.