How Ryuzi Koshikubi Keeps the Soul of JDM Alive in the Shadows of Goto Island

The Forza Horizon franchise has captured the ultimate automotive fantasy: a world where car culture is a sun-drenched, universally celebrated festival. With Forza Horizon 6 out now, which takes drivers directly into the breathtaking landscapes of Japan, players are fully immersed in the world’s most iconic JDM (Japanese Domestic Market) subculture. While the game spotlights this vibrant community on a grand scale, the foundational soul of JDM is rooted deeply in a quieter, more isolated reality. As highlighted in Forza Horizon 6’s The Art of Driving video series, where automotive photographer Larry Chen tracks down the roots of this movement, authentic Japanese tuning lives far from the mainstream.

Chen traveled by morning ferry across the water to Goto Island in Nagasaki, capturing the quiet, isolated reality of Ryuzi Koshikubi of Koshikubi Engineering, a legendary engine builder who has dedicated his entire life to the craft. For a gaming franchise that relies on the deep heritage of Japanese cars to anchor its virtual world, this specific, remote location bridges the gap between both worlds: Koshikubi guards the uncompromising roots of JDM but Forza Horizon 6 transforms that fierce spirit into a global excitement for millions to experience.

By shifting the focus to Goto Island, the narrative of Japanese car craftsmanship transforms from a glossy aesthetic into a monastic, high-stakes pursuit. In small, traditional rural communities, a builder dedicating his life to creating brutally fast machines is often misunderstood. Forza Horizon 6 masterfully offers a space of boundless imagination and experimentation. With Koshikubi’s workshop, he introduces us to the rawness of real-world mechanical tuning, grounding the virtual fantasy in a more humanly profound way. Reflecting on his life spent engineering legendary L-series and RB26 powerplants, Koshikubi says, “I build dangerous engines. Terrifyingly fast engines. When I confront that reality, I don’t think in terms of beautiful words like ‘aesthetics.’ Instead, I feel grateful to exist within this brutal world called tuning.” It is precisely this raw intensity that Forza Horizon 6 honors; by translating the terrifying, edge-of-your-seat physics of Koshikubi’s real-world masterpieces into a digital sanctuary, the game allows players to safely experience the thrill of limits that few dare to push in reality.

While modern gaming brilliantly shines a spotlight on car tuning as an inclusive, universally praised art form, Koshikubi’s daily life beautifully preserves the culture’s historic roots as a bold rebellion against the status quo. Rather than being deterred by a hostile environment, his intense focus is actually sharpened by it. By gracefully tuning out the noise of critics, he elevates his craft into a pure expression of personal conviction rather than a search for external validation.

Yet, it’s precisely this geographic and social exile that breeds the ultimate prestige. True JDM isn’t a mass-market product you can find at a local dealership; it is a destination you must suffer to reach. Koshikubi recalls a turning point five or six years ago when Akira Nakai, the world-famous mind behind RAUH-Welt BEGRIFF (RWB) Porsches, visited his remote shop. Nakai challenged the builder’s isolation not as a disadvantage, but as his greatest asset: “Isn’t the fact that this place is Goto itself part of the branding? People from overseas can’t easily come here. But the ones who absolutely want to meet you and have you build their engine will travel any distance to get here. A place visited only by people who think, ‘It has to be you’ — that’s something incredibly special.”

This relationship offers a wonderful perspective for players exploring Forza Horizon 6. The digital world serves as a canvas of instant gratification, inviting players of all skill levels to customize and upgrade dream cars in the blink of an eye. In contrast, Koshikubi’s workshop preserves the sacred, slow-paced tradition of the master builder, where time is measured in precision and patience rather than seconds. He grounds this duality by shedding light on the quiet dedication required in his shop, pointing out that, “many people in Japan and overseas may imagine this place as a glamorous and lively factory. But in reality, it’s the complete opposite. Day after day is filled with quiet, meticulous work, matching the weight of intake and exhaust valves, measuring and refining piston clearances, cutting pipes for welding, and countless other painstaking tasks.”

To understand why this grueling isolation is necessary, one must look at the history of the engines themselves. In the digital universe of Forza Horizon 6, an inline-six engine like the Nissan RB26 is regarded as a high-performance masterpiece, meticulously rendered so players can feel its legendary power. This virtual tribute honors the real-world masters of the craft, for whom these platforms represent a lifetime of absolute dedication, obsession, and fierce rivalry. “For me, the L-series and the RB26 engines were, in one word, ‘the beginning of hell,’” he says. Driven by the frustration of losing to his friends’ GT-Rs, he also poured everything financially into his craft. It was a relentless pursuit born from defeat and it was an authentic, high-stakes origin story that Forza Horizon 6 mirrors, translating a lifetime of mechanical grit into an exhilarating campaign that sheds light on the determination it takes to be the best.

This relentless struggle informs a philosophy that treats engineering not as an artistic lifestyle choice, but as a rigid submission to the laws of nature. Koshikubi frames his relationship with horsepower as a humbling confrontation with the absolute. He notes that, “there are laws of physics in this world that cannot be bent. I call them ‘God’s convenience.’ If God built an engine, it would surely be perfect. But can a human create an engine that surpasses God’s? That’s nearly impossible.” This showcases how both mediums celebrate the laws of physics in their own unique ways. While Forza Horizon 6 optimizes its mechanics to give players the pure, unadulterated joy of flawless performance, Koshikubi finds his fulfillment in the endless journey of real-world engineering, honoring the laws of nature through a lifetime of dedicated craftsmanship.

Consequently, as modern media helps JDM culture flourish into a widely appreciated art form, Koshikubi reminds us of the discipline that built its foundation. For this creator, the essence of a car—much like the legendary Japanese swords that fascinated him as a youth—is defined not by trends or visual appeal, but by its uncompromising performance and pure intent. “Their true purpose was to cut. Their overwhelming sharpness was their essence,” he reflects. “And it was precisely in that raw functionality that I found beauty.”

The arrival of Forza Horizon 6 marks an incredible milestone in honoring Japan’s automotive legacy, and Koshikubi’s life work provides the profound heartbeat beneath that pixelated surface. His insights remind us how a virtual experience can spark a lifetime of curiosity, elevating the excitement of the game in the deep reverence required by real machinery.

The legacy he champions transcends a sacred state of mind. “I want to pass on a philosophy of one that faces both the brilliance and cruelty of cars head-on, never forgetting a sense of fear and respect for life itself while seriously confronting machines,” he concludes.

As players embark on their virtual journeys, they are participating in a living global festival, one deeply enriched by the solitary, uncompromising artisans who preserve the culture’s authentic soul.