VW 3 Cylinder diesels
Short summary:
VW 3-cylinder diesels. Freduce weight and ensure ultimate mechanical efficiency. The use of aluminium, plastics, even magnesium in the body and chassis has produced a formidable weight saving ...
Long summary:
VW 3-cylinder diesels Car test R0027A See also R9612 and R9959 VW 3-cylinder diesels Featuring Polo 1.4 TDi and Lupo 3L T HIS ISNT THE FIRST THREE-CYLINDER diesel in modern times Daihatsu had one under the bonnet of the Charade in the early eighties. However, this state-of-the-art VW diesel has come to fruition as part of a project to demonstrate how frugal and environmentally considerate future motoring can be. In 1.2 litre/61bhp guise, installed in a special version of the Lupo (not yet on sale here in the UK), VW claims that its fuel consumption will average 3 litres per 100km (i.e. 94½ mpg) in the official tests hence the title Lupo 3L(itre). To achieve such frugality, VW has virtually reconstructed the model, so that although it looks similar to any other Lupo, in fact it bristles with ingenious (and expensive) solutions to reduce weight and ensure ultimate mechanical efficiency. The use of aluminium, plastics, even magnesium in the body and chassis has produced a formidable weight saving, compared with an equivalent, regular-series Lupo 1.7SDi, and its aerodynamic efficiency has improved from a Cd value of .32 to .29. However, its the under-bonnet wizardry that plays a major role. As well as the direct-injection three-pot turbo-diesel, the conventional five-speed synchromesh gearbox is also electronically controlled, it uses hydraulics to do the shifting, so it finishes up behaving like an automatic, with an additional Tiptronic manual shift facility when required. Even the automatic shift sequence has dual modes for ultimate fuel economy, an Eco button on the facia is depressed, which results in very early upshifts (1800rpm on half-throttle compared with 2800rpm in non-Eco mode), plus two other features. These are a freewheel on the overrun (like being in neutral) and the engine switching off a few seconds after coming to a traffic halt if the footbrake stays depressed. The traffic-lights turn green, you release the brake and the engine starts again, with gentle creep (just like a conventional automatic) in gear. We found the early upshifts embarrassing at times (when it changed from first to second half way across the traffic, emerging from a junction, for instance) and the shift quality can be rather ponderous, especially when taking off from rest. In non-Eco automatic guise, these special effects dont occur and if you prefer a clutchless manual car, May 2000 TEST UPDATE Continued on 2 PERFORMANCE 1.4 TDi Acceleration time in seconds Type of use with air conditioning off* mpg Urban (17mph average/heavy traffic) 39½ Suburban (27mph average/6.4 miles from cold start) 55 Motorway (70mph cruising) 55½ Cross-country (brisk driving/20 miles from cold start) 64½ Rural (gentle driving/20 miles from cold start) 76 Typical mpg overall 62 Realistic tank range (not nominal tank capacity) 37 litres/500 miles *with air conditioning switched on, consumption will increase by 24% in winter and 48% in summer FOR THE TECHNICAL Polo 1.4TDi ENGINE Type ...
Source: www.theaa.com
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