Toyota 7

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Toyota 7 "415S"
Toyota New 7 "474S"
Toyota Turbo Charged 7 "578A"
Toyota 7 1970.jpg
Auto racing Can-Am
Constructor Toyota and Yamaha Motor Company
Automotive design Jiro Kawano
Technical Specifications
Chassis Fiberglass body on Aluminium tubular chassis
Suspension (front) Double wishbone suspension, coil springs over dampers, anti-roll bar.
Suspension (rear) lower wishbones, upper links, trailing arms, coil springs over dampers, anti-roll bar.
Internal combustion engine 3000 Cubic centimetre / 4986 Cubic centimetre[1] V8
Naturally aspirated / Turbocharged
Mid-engine, Longitudinal engine
Transmission (mechanics) Aisin 5-speed Manual transmission
Weight 620 kg / 1366.9 lb
Tire Firestone Tire and Rubber Company Indy[1]
Competition History
Notable entrants Toyota
Notable drivers Minoru Kawai,
Hiroshi Fushida,
Tetsu Ikuzawa,
Shihomi Hosoya
Toshiaki Takahashi
Vic Elford
Hiroyuki Kukidome
Sachio Fukuzawa
Debut 1968 Japanese Grand Prix
 Races   Wins    Pole position     Fastest lap   
4

The Toyota 7 was a Auto racing developed by Toyota Motor Company and subsidiary Yamaha Motor Corporation.[2] Designed primarily for use in the Japanese Grand Prix, the cars were Toyota's first custom-built racing car, competing under the FIA's Group 7 rules, similar to the Can Am series in North America and Interserie in Europe.[3]

The 7, known by the internal code 415S[4] was developed by Jiro Kawano, who had also developed the 2000GT that Toyota had previously entered in the Japanese Grand Prix.[2] Yamaha constructed the chassis while the new 5.0 litre V8 engine was built by Toyota. The V8 that powered the 7 replaced the Straight-6 engine used in the 2000GT due to the increase power potential of the larger engine. This engine was capable of producing up to 300 Horsepower, thanks to the addition of a Dual overhead cam design.[2] However, the 3.0 litre V8 which was used in the early years was not powerful enough to compete with the Chevrolet and Porsche-powered competitors. This led to the development of a 5.0 litre version, capable of 600 Horsepower. The initial bodywork was similar to other Group 7 cars, with an open two-seater cockpit and large intakes behind the doors. Exhaust pipes were placed directly on top of the engine, exiting straight off the tail of the car. A simple rollhoop protected the driver.

The 7s made their debut at the 1968 Japanese Grand Prix, four entries starting and two of those finishing, taking eighth and ninth places.[2][5] Although the 7s finished, they were well behind their main competitor, Nissan Motors, who had not only two new Nissan R381, but also three older Prince R380 finish in the top six.[5] Porsche also managed to finish ahead of Toyota with their Porsche 906. Toyota entered the 7s in several other Japanese events that year, including the 1000 km Suzuka, where the cars took the top four positions.[2] A 200-mile (320 km) event was held at Fuji Speedway against invited contenders from the Can Am series, with five 7s entered; the Toyotas finished fourth, fifth, sixth, eighth, and ninth.[5]

The 7's V8 engine in its twin-turbocharged form.

For 1969, the 7s were evolved in order to adapt to problems on the original cars. The bodywork was completely redesigned, shaped similar to a large broad wedge for increased front downforce. For the rear of the car, the exhaust pipes were placed within the bodywork, while an intake scoop was mounted over the rollbar. These new 7s were referred to internally as the 474S, while press material referred to it as the New 7.[4] The revised New 7s continued to show their potential, winning the 100 km Suzuka once again.[6] For the New 7s main event, the Japanese Grand Prix, Nissan arrived with their revised Nissan R382. Although Toyota was able to outperform Porsche, including a factory-run squad in a new Porsche 917, the Nissans once again proved too daunting, taking the top two spots by a lap over the Toyota.[6]

Toyota made plans to revise the car once again for 1970, most notably by the addition of two Turbocharger to the V8 engine.[2] These additions boosted power to 800 hp.[7] A large rear wing was also added to the 7, helping to increase rear downforce and traction. This car was known by the name 578A[4]

However, the Japanese Automobile Federation (JAF) announced that the Japanese Grand Prix was to be revised for use by Open wheel car from 1970 on.[2] This forced Toyota to cancel the 7 program, although at least one turbocharged 7 had been completed prior to the announcement.

Toyota planned to move the cars to North America and enter Can-Am, however drivers Ja:福澤幸雄[8] and Minoru Kawai[9] were killed in separate testing accidents in February 1969 and August 1970.[3] Sachio was in fact testing the only Coupé version of the car that was especially built when he fatally crashed.[1] This would be the last Sports prototype built by Toyota until the 1980s.

References


  1. 1.0 1.1 1.2 "THE YOUNG SOLDIERS and TOYOTA-7 vol.2" (in Japanese). 26 September 2000. http://www.mmjp.or.jp/60srace/TOYOTA7andSOLDIERS2.html. Retrieved on 2007-12-29. 
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 "Legend of the Little Monster: Toyota 7". Toyota F1 Team. http://www.toyota-f1.com/public/en/motorsports/toyota7/index1.html. Retrieved on 2007-12-23. 
  3. 3.0 3.1 "Toyota 7". Ultimatecarpage.com. http://www.ultimatecarpage.com/car/1420/Toyota-7.html. Retrieved on 2007-12-29. 
  4. 4.0 4.1 4.2 Tomica Limited No.11: Toyota 7, Car Magazine Edition booklet, ISBN 4777001598
  5. 5.0 5.1 5.2 "Non Championship Races 1968". World Sports Racing Prototypes. 2 October 2005. http://wsrp.ic.cz/nonchamp1968.html. Retrieved on 2007-12-23. 
  6. 6.0 6.1 "Non Championship Races 1969". World Sports Racing Prototypes. 18 November 2007. http://wsrp.ic.cz/nonchamp1969.html. Retrieved on 2007-12-23. 
  7. "Grand Prix Cars". Toyota Automobile Museum. http://www.toyota.co.jp/Museum/data_e/a03_11_2.html. Retrieved on 2007-12-23. 
  8. "アクシデント 福沢幸雄 1969年" (in Japanese). All For Win!. http://afw.fc2web.com/ziko/1969FukuzawaSachio.htm. Retrieved on 2007-12-29. 
  9. "アクシデント 川井稔 1970年" (in Japanese). All For Win!. http://afw.fc2web.com/ziko/1970kawai.htm. Retrieved on 2007-12-29. 

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