The GT6 Mk I
The new car was introduced in 1966 and called the Triumph GT6. The new body was a sleek fastback design with an opening rear hatch (This gave the GT6 the nickname "Poor man's E-Type".) It was really a 2-seater, but a small extra rear seat could be ordered if required and was large enough for small children. The family resemblance to the Spitfire Mk II was strong, the longer 6-cylinder engine necessitated a new bonnet top with a power bulge and the doors were provided with opening quarter light windows and squared-off glass in the top rear corner. The 6-cylinder engine was tuned to develop 95 bhp (71 kW) at 5000 rpm, and produced 117 lb·ft (159 N·m) of torque at 3000 rpm. The increased power necessitated certain changes to the Spitfire mechanics; the radiator was new and mounted further forward in the car and the gearbox was the stronger unit from the Vitesse, with optional overdrive. Front springs were uprated to cope with the extra weight from the new engine. The overall vehicle weight unladed was 1,904 lb (864 kg). The interior of the GT6 was well equipped; a wooden dashboard housed a full complement of instruments, with carpets and heater included as standard.
The new car had some very strong selling points. The new engine provided a 106 mph (171 km/h) top speed and 0–60 mph in 12 seconds, a little better than the MGB GT. Moreover, the unit was comparatively smooth and tractable, in marked contrast to the MG's rather harsh 4-cylinder motor. Fuel economy was very reasonable for the period at 20mpg, and the interior well up to the competition. The only major criticism was of its rear suspension; the GT6 inherited the swing-axle system from the Spitfire, which in turn was copied from the Herald small saloon. In the saloon it was tolerated, in the little Spitfire it was not liked and in the powerful GT6 it was heavily criticised. Triumph had done nothing to improve the system for the GT6 and the tendency to break away if the driver lifted off the power mid-corner was not helped at all by the increased weight at the front of the car. The handling was most bitterly criticised in the USA, an important export market for Triumph, where they were traditionally very strong. Similar criticism was being levelled at the Vitesse saloon, which shared the GT6's engine and its handling problems.
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