Voisin made his car racing debut in 2019 in the Ginetta Junior Championship with Douglas Motorsport. The season proved difficult; he finished thirteenth overall from twenty-three races with a best result of seventh at Thruxton. He also entered the Ginetta Junior Winter Championship that year with R Racing as a guest driver, recording one podium but ineligible to score points.
He returned to Ginetta Junior in 2020 with R Racing and immediately found form. He won the season opener at Donington Park and added victories at Brands Hatch, Knockhill, Thruxton, and a double at Silverstone. Seven wins, nine pole positions, and thirteen podiums from twenty-one races brought him into title contention, but he fell twelve points short of champion Tom Lebbon at the Brands Hatch finale, finishing third overall with 516 points.
In 2021 Voisin joined United Autosports in the GT4 European Series Silver Cup class, paired with Charlie Fagg in a McLaren 570S GT4. The partnership opened with back-to-back victories at the Monza season opener, immediately taking the championship lead. A third place at Paul Ricard and points finishes at Zandvoort temporarily allowed the Nr.8 CMR entry to lead the standings, but Voisin and Fagg responded with pole position and a race win at Spa-Francorchamps and two further podiums at the Nürburgring. The title was clinched at the final round in Barcelona: a fifth-place finish in Race 1 created an unreachable points margin. Over twelve races they accumulated three wins, two pole positions, one fastest lap, and six podiums, finishing with 191 points in first place.
Voisin stepped up to the European Le Mans Series in 2022, continuing with United Autosports in the LMP3 class alongside Josh Caygill and Finn Gehrsitz, driving a Ligier JS P320 powered by a Nissan VK56DE 5.6-litre V8. After leading at Monza for over half the race before a hit and spin dropped the car to fifth, a second place at Le Castellet (elevated from third after a disqualification ahead) and a second place at the Algarve finale gave the trio two podiums. They finished eighth in the championship with 48 points.
In 2023 Voisin moved to GPA Racing for a partial GT4 European Series Silver Cup campaign, scoring two points from eight starts. He also entered the GT World Challenge Europe Endurance Cup at the 24 Hours of Spa-Francorchamps with Walkenhorst Motorsport's BMW GT3 team, completing a driving stint of six hours including four hours at night before the car was retired in the twenty-first hour with an oil pump failure. Later that year, competing in the Nürburgring Nordschleife Licence (NLS) series with Walkenhorst Motorsport, Voisin secured a class victory at Round 9 — a result that earned him the full Nordschleife racing licence.
Voisin returned to ELMS LMP3 in 2024 with RLR MSport, again in a Ligier JS P320/Nissan alongside James Dayson and Daniel Ali in the number five car, finishing thirteenth in the championship with 21 points over six rounds. For 2025 he entered the Le Mans Cup GT3 class with Code Racing Development.
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