Ginetta Cars announced in November 2010 that they were going to be building a new sports car, and named it as the G55. In February 2011, the car was released, as a more powerful evolution of the G50. The G55 featured a Ford-sourced 3.7 litre V6, producing 370 hp, in addition to a 6-speed sequential manual gearbox, built by Hewland. The new car did not replace the G50; instead, it supplemented it, and the Ginetta G50 Cup was rebranded as the Ginetta GT Supercup. The G55 was available for sale for £75,000, or as an upgrade from the G50 for £25,000.
The car made its British GT debut in the Oulton Park rounds of the 2011 season, with four separate entries competing; the best result of the event came courtesy of Century Motorsport, whom took a ninth-place finish at the second race of the day. Century Motorsport were also responsible for the car's best finish of the season; a fourth place at Rockingham Motor Speedway, in the first race of the day. A GT3 test mule was run by Rollcentre Racing (using the Cup engine with some GT3-specification components) in the 2011 Britcar 24 Hours; however, the car failed to finish the race.
In 2012, Ginetta introduced a full GT3 version of the G55, which featured a Ginetta Racing-built 4.35 litre V8 engine in place of the Cup's 3.7 litre V6. Previously, they had used the Cup-spec car in GT3 races. Like the Cup car, it used a Hewland-sourced gearbox; however, it features wider wheels than the Cup car. The G55 GT3 made its first appearance at a Donington Park test session. The GT3 car made its competitive debut at the Silverstone round of the Britcar GT series, with Optimum Motorsport entering it; they finished eighth overall, and third in Class 1. The car's first win came at the Donington Park round of the Britcar series; with Team LNT and Optimum Motorsport taking a G55 one-two.
The Ginetta G55 is also running in the 2020 ADAC GT4 championship: with a naturally aspirated 3.7L engine, delivering 380 PS and weight of 1085 kg. The Ginetta G55 GTA is being sold in North America as part of a campaign to interest people in American sports-car racing. This model is also suitable for people who want a track day car for weekend time trials and high-performance driving education events.
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