Polo Driver

Following our recent first drive of the turbocharged Polo SEL and in the first of a new series of articles, Victoria Stubbs from Volkswagen retailer group Vindis explains the technology behind the company’s TSI engines, as used in the new Polo GTI

If you’re looking into buying a new Volkswagen you might have wondered what a TSI engine is, and what the difference is between a TSI and TDI. Simply put, TSI are Volkswagen’s petrol engines and the TDIs are diesel. However there’s a bit more to it than that; the TSI engines actually take features from the diesel TDIs and normal petrol direct injection engines and mix them together.

The 1.4-litre TSI unit is a ‘hybrid’ engine that combines petrol direct injection with what VW call ‘twincharging’ – a turbocharger and supercharger working together. The result is a compact yet powerful engine that scores highly for both performance and economy, runs smoothly and quietly, and produces less CO2.

The following features are at the heart of the TSI formula:

First, a smaller and lighter engine. Decreasing engine size means less power is lost through friction, and reducing weight means the engine has less to move.

Second, direct petrol injection and twincharging. Engines run by burning fuel (combustion). The more efficient the combustion, the higher the power output and the lower the fuel consumption. VW’s twincharging system means a turbocharger and supercharger working together. The supercharger is powered via belt drive from the crankshaft, giving optimum pulling power even at very low revs. At higher speeds the turbocharger (a system that uses the energy from exhaust gases to power the air intake that is essential for combustion) joins in, making the system more energy-efficient.

Volkswagen have used a number of design tricks to make the TSIs even more efficient. These include redesigning moving parts to use less materials (and therefore be lighter) and optimising the fuel injection. This second point needs a little more explanation.

Two of the key factors in engine design are pressurising and cooling air in the cylinder (because oxygen is needed for combustion and air is only 21% oxygen), and pressuring fuel so that it can be injected into the cylinder as a fine spray and mix as quickly and evenly as possible with the compressed air prior to combustion. The TSI’s turbocharger has its own separate air cooler, which means that the volume of air held in the system to charge the cyclinder with has been halved. The pressure required for combustion can build up far more quickly, meaning further efficiency savings all round.

The TSI engine has been well-received by motor critics worldwide, and the 1.4-litre twincharger unit has won the International Engine of the Year award in the 1.0-1.4 litre category every year since 2005. It also won Best Green Engine in 2009. A 1.2-litre TSI engine is also available, fitted with a turbocharger only.

Victoria Stubbs, Vindis
Vindis are retailers for all Volkswagen models including the ever-popular secondhand VW Golf

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It’s the news we’ve not been waiting for. While the Polo GTI with 178bhp will be speeding into the junior hot hatch market later this year, the much-rumoured Polo R will not be following it. At least that’s the story according to UK motoring weekly Auto Express, which states that bosses at the German giant’s new performance division have vetoed a new 200bhp-plus Polo to take on the Renaultsport Clio 200, the current junior hot hatch king. We’d heard it rumoured, but didn’t want to believe it.

The confirmation comes as VW launches its new performance division, Volkswagen R GmbH. Set to be what M Division is to BMW and AMG to Mercedes-Benz, the new company will focus on producing the hottest versions of regular models. The new engineering-focused division already bears fruit; the 269bhp Golf R and 264bhp Scirocco R (pictured above) are both products of the R team. R-Line models with cosmetic upgrades but no mechanical tweaks will also originate from the newly-created division.

Based not far from Volkswagen’s huge Wolfsburg corporate headquarters at Warmenau, Volkswagen R GmbH has more than 350 staff, meaning that super-performance-focused cars can be developed and built from the ground up. Future projects include a production version of the Detroit 2009 motor show wowing BlueSport roadster, but not, it would seem, an ultimate performance Polo.

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Lower consumption and emissions combine with higher driving dynamics

Currently the Polo’s most powerful engine until the GTI comes along in the summer, the 1.2-litre TSI unit is one of the family of Volkswagen’s TSI powerplants that have been awarded the environmental commendation certified by TÜV Nord. The Life Cycle Assessment on which the commendation is based confirms that the TSI engines have significantly improved environmental characteristics compared with the predecessor models throughout their life cycle thanks to their smaller engine size and lower fuel consumption – while at the same time evidencing higher driving dynamics.

It’s not the first time Volkswagen has won awards for its engine and gearbox technology; last year the automotive giant won three prestigious ‘Engine of the Year Awards’. After the DSG dual-clutch transmission, the TSI engine tech, the second of the three basic technologies in the BlueMotion Technologies brand, has confirmed its outstanding Life Cycle Assessment. BlueMotion Technologies is the Volkswagen umbrella brand for all environmentally-friendly, energy-efficient products and technologies. Thanks to a reduction in engine capacity, the TSI engines significantly lower fuel consumption and CO2 emissions.

For commendation, a 1.4 TSI engine with 120bhp was compared with a 1.6 FSI engine with 114bhp, while a second test compared the Polo’s 1.2 TSI unit with 104bhp and a 1.6 MPI engine with 100bhp. The environmental commendations, which are based on Life Cycle Assessments pursuant to ISO 14040/44, investigate the environmental characteristics of vehicles or technologies throughout their entire life cycle, from manufacture through use to recycling. The environmental commendation is only issued if the overall performance of the new development is better than that of the respective predecessor.

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Environmental protection is the top priority for Volkswagen: new campaign for efficient driving and environmental awareness

Volkswagen launched its new ‘Think Blue’ campaign on 27 February, using and building on its BlueMotion tag for its greenest and lowest-polluting models. The company says that ‘protecting the environment is simple and everyone can help in their everyday lives,’ and that along with BlueMotion, it is ‘sending out a new signal for sustainable mobility.’ Marketing puff maybe, but the newest incarnation of the Polo BlueMotion is set to play a major part in the Think Blue marketing campaign.

Fielding press and TV advertisements, brochures, web specials and the Think Blue Challenge game for both the iPhone and iPod Touch, all the marketing strands feature a focus on potential savings, sustainability and environmental awareness. The popular interactive Volkswagen Polo Challenge game for example, seems to have been adapted to become the Think Blue Challenge app, where gamers drive more environmentally to use less fuel. In all materials for the campaign, the predominant colour is – ironically for a green campaign – blue, again underpinning the BlueMotion philosophy. The company’s goal is to establish Think Blue as an expression of its corporate mindset and a firm feature of its ecologically sustainable activities.

Linking its future with its past, Volkswagen is pillaging its archives to come up with the launch advertisement, featuring the infamous ‘Think Small’ strapline, which trumpeted the international success of the Beetle in the 1960s. ‘The “Think Small” slogan symbolises Volkswagen’s achievement in democratising mobility the world over. The challenge of the future lies in achieving efficient and sustainable mobility for everyone. This is expressed by the campaign: “Think Small” has become “Think Blue”,’ Luca de Meo, Head of Marketing at Volkswagen Passenger Cars explains.

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While Polos are obviously our main interest here at PoloDriver, we do have a roving eye for most other Volkswagen models, too. So, last summer, we took a 1.2-litre Fox Urban to the North York Moors for a 1200-mile road test to see if Volkswagen’s city car can do most of what the Polo can do, but for £2000 less. Can the smaller, Brazilian-built town tiddler be a true cut-price Polo alternative, and is there character busting to get out under all that functional practicality? For answers to these questions and more about the global Fox family, read our digital mini-mag (previewed below) here.

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