During the 2025 edition of the GP de São Paulo 1,000 Milhas, Sigma P1 Engenharia presented another chapter in the history of its prototype lineage: the Sigma P1 G5 Evo. Based on the knowledge acquired with the prototypes that compete in the P1 and P2 classes of the Brazilian Endurance, the new car is being developed for a single-make and single-team category that will be promoted by Interlagos Sport Marketing.
Tech Analysis
The Sigma P1 G5 Evo shares the same chrome-molybdenum steel chassis as its P1-spec siblings, designed to FIA SCC-2001 regulations. The design maintains a focus on safety with the presence of a carbon fiber front impact attenuator, and side and rear impact attenuators in aircraft-grade aluminum, as well as side anti-intrusion panels.
In addition, the new model uses a Chevrolet LT1 6.2-liter V8 engine with 450 HP, with FuelTech FT700 electronics. This engine is coupled to a Sadev SLR90-20 6-speed sequential transaxle, with paddleshift on the steering wheel, which is also new and was developed in partnership with Lotse.
By the way, the interior of the G5 Evo received special attention to detail, with carbon fiber and leather upholstery, as well as an electric on-board air conditioning system, with active defogging in races held in rainy conditions on the track.
Even with the improved internal trim and air conditioning system, the new prototype keeps the weight at 980 kg while being capable of generating 1000 kgf of downforce at just 200 km/h – for comparison purposes, this number is higher than that of Group C prototypes such as the Sauber C9 and Porsche 962.
The aerodynamics, in fact, bring several elements from the P1 class siblings, such as the repositioned splitter (1), which debuted at Cascavel de Ouro in 2023, but without the now famous front flaps. The wheel arches are ventilated through louvres (2), while the entire central section maintains a configuration similar to the other G5 models.
The side follows the G5 philosophy, but the sidepod has been redesigned: the main intakes (3) have been slightly enlarged and now feed the oil radiators, while the rear intakes (4) have been moved forward and are smaller, and only serve to cool the rear brakes. The engine cover has been presented without the dorsal fin, as in the P2-spec Sigma G5.
Moving to the rear section, the spoiler follows the P2 specification with two elements and lower support, but adopting a Hypercar-esque endplate solution (5), similar to the one that debuted in the P1 class during the 2024 Endurance Brasil season.
With this package, the Sigma P1 G5 Evo promises to have performance equal to that of a GT3, at a lower cost than a GT4, with a higher level of safety.
The diffuser and rear section also follow the 2024 P1 configuration, with a larger expansion area and the same geometry as the rear bodywork.
The Sigma P1 G5 Evo will undergo a development period with a view to the new championship, which aims to have 15 cars on the track in races contested in two sprint heats, which will be part of the Paulista Automobile Championship schedule from 2026.
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