General Motors has just been granted a patent by the United States Patent and Trademark office for a two stage turbo setup with variable geometry in an internal ...

Turbochargers are wonderful things, taking waste energy and using it to help an engine to produce more power. The variable-geometry turbocharger is an advanced version of this technology, which brings ...

Not to say that they’ve disappeared entirely, but 10 years ago they seemed to be one of the hottest bits of new engine tech on the market. Nowadays however, finding them on petrol-powered sports cars ...