This is our first opportunity to hear the 4.0-litre V12 at speed, and as Franchitti approaches the headline-bating 12,100rpm rev limit, the engine note has obvious echoes of the twelve-cylinder power units used in Formula 1 until 1996. As was the case with the McLaren F1 (also developed by Gordon Murray and widely regarded as the T50's spiritual forebear), this test mule, known as George, is based on an Ultima, which is usually powered by a Chevrolet-derived V8 and as such has had to be extensively modified to accomodate the larger engine. Three functioning XP cars are in operation, however, and one will star at the Goodwood Member's Meeting next week, lapping the Sussex circuit in anger in what will be the T50's public debut. The biggest mechanical difference between George and the final production car is that the early prototype goes without the T50's trademark downforce-enhancing fan technology. Inspired by the device used by Brabham's 1978 F1...
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