• Parent company British Leyland
  • Manufacturer Triumph Motor Company
  • Production 1978–1981
  • Assembly Canley, West Midlands, England
    Speke, Merseyside, England
    Solihull, West Midlands, England
  • Body style(s) 2-door convertible
  • Class Sports car
  • Engine(s) 3528 cc V8
  • Transmission(s) 5-speed manual
  • Height 1,267 mm (49.9 in)
  • Length 4,067 mm (160.1 in)
  • Width 1,681 mm (66.2 in)
  • Wheelbase 2,160 mm (85.0 in)
  • Kerb Weight 1,203.9 kg (2,654 lb)
  • Layout FR layout
  • Predecessor Triumph TR6
  • Related Triumph TR7

The history of the Triumph TR8


The Triumph TR8 is an eight-cylinder version of the "wedge-shaped" Triumph TR7 sports car, designed by Harris Mann, and manufactured by British Leyland (BL), through its Jaguar/Rover/Triumph (JRT) division. Because of its outstanding performance, the TR8 was often dubbed the "English Corvette". The majority of TR8s were sold in the United States and Canada.
A more powerful V8-engined version of the TR7 was planned in the early stages of the TR7's development, a prototype being produced in 1972. However, British Leyland's financial state and labour problems delayed the project. By 1978 some 145 prototype cars were built with V8 engines (and usually automatic transmissions). These "anonymous" TR8s (no identifying badges, and all coupes) were evaluated for British Leyland by various dealers and then sold off as used cars.
The TR8 did not use Triumph's own single overhead cam V8 as found in the Stag due to an unreliable service record but instead shared its Rover V8 engine with the Rover SD1. The engine itself was derived from an early 1960s Buick/Oldsmobile all-aluminum 215 cu in (3.5 L) V8 unit that Rover acquired from General Motors in the mid-60s. History has shown this engine to be an extremely reliable, flexible, and robust powerplant. TR8s were initially fitted with twin Zenith-Stromberg carburettors. However, all 1980 models sold in California, all 1981 models (of which only 352 were produced including 20 cars for the UK market) and all 1982 models (of which all 69 went to Canada) featured a Bosch L-jetronic fuel injection system with a specially designed Lucas fuel injection computer (ECU). The carburettor model was rated at 133 bhp (at around 5000 rpm) and the fuel injected at either 137 or possibly 148 bhp delivering 0-60 mph times in the low 8 seconds. Other differences between the TR8 and TR7 are upgraded brakes, revised axle ratio (3.08:1 on the TR8), battery moved to the boot, alloy wheels, leather steering wheel and a few minor trim changes.
Pre-production TR8 coupes produced from 1978 to 1980 are quite rare; perhaps only 400 TR8 coupes ever existed (from records kept by members of the North America-based wedge club). In 1980, a Michelotti re-designed TR8 Drophead (convertible) was introduced, and all subsequent TR8s were convertibles. Total worldwide production, as best as can be determined throughout all the labour turmoil at the time, is only around 2750, give or take a "handful". Other estimates exist.  The TR7 and TR8 were made until October 1981 when production ceased.
Very few genuine TR8s exist outside of the United States and Canada. In other countries the TR7 is often converted to a "TR7V8" with the same ubiquitous Buick/Rover 3.5 litre V8 powerplant used in original factory TR8s. In Australia a popular TR7V8 conversion is to use the 4416 cc version of this engine that had been developed for the Leyland P76.
In North America, the TR8 originally sold for around $11,000. A current rough estimate of the number of these cars remaining (taken from the old TR8 Car Club of America's Registry of unique VINs), the World Wide TR7 TR8 Owners Club and the TR Drivers Club UK is around 750 convertibles and 190 coupes. Work is progressing on getting an even better estimate by the newly reformed Triumph Wedge Owners Association.

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