TOYOTA TF109

   The new Toyota TF109 represents the technical pinnacle of Toyota’s Formula 1 project, but it also coincides with the Japanese giant’s sudden withdrawal from the sport. The Panasonic Toyota Racing Team is still divided between the parent company’s headquarters in Japan and the European base, Toyota Motorsport GmbH (TMG) in Cologne, Germany. Team Principal Tadashi Yamashina serves as the direct link between the two structures and, unlike his predecessors, adopts a more hands-on approach, aiming to streamline the bureaucracy that had slowed the team in previous years. The team’s technical core is based in Cologne and reports to Technical Director Pascal Vasselon. The French engineer (formerly of Michelin) is the architect of the team’s technical resurgence. Thanks to him, the team pushes for an aggressive interpretation of the regulations, abandoning imitation and embracing innovation, as demonstrated by the double diffuser developed in parallel with Brawn GP. The German facility houses two of the most advanced wind tunnels of the era, and Mark Gillan (Head of Aerodynamics) and Jason Somerville (Deputy Head of Aerodynamics) are tasked with translating theoretical data into on-track performance.

TOYOTA TF109, Jarno Trulli
Hungaroring, Hungarian GP 2009 

   Despite the excellence of its individuals, the 2009 Toyota staff still suffers from psychological pressure exerted by the Tokyo management. Every technical decision must go through complex approval processes at the parent company. As a result, Mark Tatham (Chief Designer), Kevin Taylor (Chief Designer - Car Concept), Tim Milne (Double Diffuser Concept Lead), along with aerodynamics specialists Gillan and Somerville, must constantly report to Yoshiaki Kinoshita (Executive Vice President - Technical) and Noritoshi Arai (Director Technical Coordination), who are based in Japan. While smaller and more agile teams can make decisions in minutes, Toyota operates like a powerful but slow-moving battleship when it comes to strategic reactions during race weekends. This explains why, despite often having the fastest car in qualifying (thanks to the Cologne-based engineers), the team frequently loses direction during races under pressure from Japanese management.

TOYOTA TF109, Timo Glock
Montecarlo, Monaco GP 2009

   Under Vasselon’s technical leadership, Toyota engineers interpret the new 2009 regulations with a boldness rarely seen in previous years. The aerodynamic heart of the TF109 is the double diffuser. While the new rules aim to limit the height of the rear extractor to reduce downforce, Toyota (together with Brawn and Williams) finds a regulatory loophole: by exploiting the rear deformable structure and the openings required for the external starter, the designers create a second airflow channel above the main one. This allows a much greater volume of air to expand under the car’s floor, generating a low-pressure area that effectively “glues” the car to the ground. The entire car is aerodynamically refined, featuring one of the most effective front wings in managing vortices, thanks to a strong outwash effect that minimizes turbulence generated by tire rotation. The TF109 is also one of the few cars to effectively use the driver-adjustable flap system (introduced that year to encourage overtaking), allowing drivers to balance aerodynamic load between slow and fast corners during the race. Toyota chooses to forgo KERS, avoiding the additional radiators and the extra weight of around 30 kg associated with the system. The TF109 stands out for its extremely slim bodywork, with a high, narrow nose, deeply undercut sidepods to channel as much air as possible toward the rear and diffuser, and an extremely tapered rear end, a masterpiece of packaging that allows airflow to move unobstructed toward the rear wing.

TOYOTA TF109, Jarno Trulli
Interlagos, Brazilian GP 2009

   Mechanically, the TF109 is a tribute to solidity and pragmatism. Toyota opts for a conservative yet highly refined approach, prioritizing reliability and lightness over the radical innovation of KERS. The RVX-09 V8 engine, designed by Kazuo Takeuchi (Engine Director) and Hiroshi Yajima (Chief Designer, Engine), is among the best, on par with Ferrari and Mercedes, but with the advantage of being designed not to work in synergy with a hybrid system, instead functioning as a perfect structural element with minimal vibrations. This results in a stiffer rear end, improving driving precision. To make the double diffuser work, Toyota designs a much narrower gearbox to free up maximum space for the airflow channels feeding the rear extractor. The rear suspension is also completely redesigned with a pull-rod layout to lower the center of gravity and, once again, to keep the upper diffuser area clean, preventing suspension arms from disturbing airflow. At the front, a conventional push-rod setup is retained. However, the car’s “honest” mechanical nature proves difficult to set up: it excels on fast, flowing circuits with smooth asphalt, where aerodynamic platform stability is ensured by stiff suspensions, but struggles on street circuits or tracks with high curbs, where the suspension cannot effectively absorb bumps without destabilizing the aerodynamics, making the car nervous and prone to sudden grip loss. Paradoxically, the operating window of the tires is extremely narrow: the TF109 is mechanically sound but cannot compensate with mechanical grip for the loss of aerodynamic downforce when temperatures drop. On several occasions, the car goes from being the fastest on track to falling to the back of the field, sometimes within a single race weekend.

TOYOTA TF109, Kamui Kobayashi
Interlagos, Brazilian GP 2009

   The drivers for the 2009 season are once again Italian Jarno Trulli and German Timo Glock, with the latter replaced in the final three races by Japanese driver Kamui Kobayashi. Thanks to the double diffuser, the TF109 begins the season as the only real threat to Jenson Button’s Brawn GP. In Australia, despite being disqualified after qualifying due to a flexible wing, Trulli and Glock fight back from the rear to finish 3rd and 4th, demonstrating superior pace. In Malaysia, they again secure 3rd and 4th positions, albeit in reverse order. In Bahrain, after locking out the front row in qualifying, only a strategic error denies Trulli what seemed to be a certain victory. As the European summer arrives, the TF109’s mechanical limitations become apparent: a car that only works in perfect conditions, so aerodynamically efficient that it does not sufficiently stress the tires, a benefit in hot conditions but a disaster in the cold. In some races, the TF109s even find themselves unexpectedly fighting to avoid finishing last. After an aerodynamic update introduced in Singapore, the TF109 regains competitiveness, ending Toyota’s F1 journey with dignity by achieving two second-place finishes. Despite being technically superior to many rivals and finishing 5th in the Constructors’ Championship, the TF109 fails to secure the long-awaited first victory for the Japanese team. Due to the global economic crisis and results that no longer justify the enormous investment (estimated at over $300 million per year), Toyota announces its withdrawal from Formula 1 on November 4, 2009, despite the next season’s car (TF110) already being in an advanced stage of development. The car never sees the track, aside from very brief private tests, before ending up in a museum.