The Green-Car-Guide e-book focuses on the most economical cars in 10 different categories. However there are some models that may not be the most economical in each category, but that are still worthy of a mention because of their blend of performance and economy. The Volkswagen Golf TSI is one of these rare cars.
The engine features twin-charging with a supercharger and turbocharger. The 1.4-litre TSI 170 PS engine claimed two accolades at the International Engine of the Year Awards 2006. The twincharger won in the 1-litre to 1.4-litre category and it was voted the Best New Engine of 2006.
So we have a small capacity engine – a 1.4 litre – which provides good economy (a combined mpg of 39.2mpg for the 140PS Golf Sport) – with a supercharger for better response at low revs, and a turbocharger for better response at high revs. A 170 PS version of the 1.4-litre TSI is also available in the GT model, which is only 1mpg behind at 38.2mpg.
The TSI uses an FSI engine, which uses direct injection to improve combustion efficiency and hence reduce fuel consumption and emissions, which is then dual-charged through a combination of an engine-driven supercharger and an exhaust gas turbocharger arranged in series.
The belt-driven supercharger operates at lower engine speeds, with the turbocharger coming in as the engine speed increases. The result of this is excellent driveability and performance throughout the range with no turbo lag, and high maximum torque from 1,750 through to 4,500 rpm.
The combination of these technologies enables a small capacity engine with a high compression ratio to cruise at part load on high gearing, to combine good performance with excellent fuel consumption for a petrol engine.
Two models are available in the Golf range, the 140PS and the 170PS, both available in 3 or 5 doors. TSI engines are also available in the Touran and Golf Plus with 140 PS only.
Volkswagen Golf Hatchback 1.4 TSI 140 Sport (3dr)
Urban mpg 29.7
Extra Urban mpg 47.9
Combined mpg 39.2
CO2 rating (g/km) 169
Green rating E
Volkswagen Golf Hatchback 1.4 TSI 170 GT (3dr)
Urban mpg 28.8
Extra Urban mpg 46.3
Combined mpg 38.2
CO2 rating (g/km) 175
Green rating E