Triumph Until the TR7′s debut, the TR series was always made up of convertibles. Many manufacturers were fearful that United States legislation would ban convertibles from its highways. While Triumph’s own Stag, for example, maintained a rag-top, it incorporated a roll-bar structure to get around this potential problem. Porsche, meanwhile, went so far as to introduce the famous Targa cars The TR7

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Whereas the TR7′s predecessor was driven by Triumph’s straight 6, a rather bland 2.0L inline four powered the new car (the same one found in early Saab 99s). Performance was lacking at best. The reasons for this engine choice, of course, being emissions and fuel economy. Furthermore, as many cars were being fitted with 5-speed gearboxes by this time, Triumph stuck with a 4-speed initially. Eventually a 5-speed would be offered, along with a 3-speed automatic. Acceleration from 0-60 could eventually achieved in a little over 10 seconds and top speed short of 110mph.