Turbocharged direct injection - wikipedia Turbocharged direct injection TDI badge TDI embossed on the engine cover Volkswagen Marine 3.0 - litre V6 TDI 265 - 6 marine engine Volkswagen Group products which feature a TDI engine display a TDI badge Turbocharged direct injection or TDI is a design of turbodiesel engines featuring turbocharging and cylinder - direct fuel injection that was developed and produced by the Volkswagen Group ( VW AG ). These TDI engines are widely used in all mainstream Volkswagen Group marques of passenger cars and light commercial vehicles made by the company ( particularly those sold in Europe ). They are also used as marine engines in Volkswagen Marine and Volkswagen Industrial Motor applications. TDI engines installed in 2009 to 2015 model year Volkswagen Group cars sold through 18 September 2015 had an emissions defeat device, which activated emissions controls only during emissions testing. The emissions controls were suppressed otherwise, allowing the TDI engines to exceed legal limits on emissions. VW has admitted to using the illegal device in its TDI diesel cars. In many countries, TDI is a registered trademark of Volkswagen AG. The TDI designation has also been used on vehicles powered by Land Rover - designed diesel engines. These are unrelated to Volkswagen Group engines. Contents 1 Overview 2 History 2.1 Emissions testing falsification 3 Motor racing 4 Fuel 5 See also 6 References 7 External links Overview The TDI engine uses direct injection, where a fuel injector sprays atomised fuel directly into the main combustion chamber of each cylinder, rather than the pre-combustion chamber prevalent in older diesels which used indirect injection. The engine also uses forced induction by way of a turbocharger to increase the amount of air which is able to enter the engine cylinders, and most TDI engines also feature an intercooler to lower the temperature ( and therefore increase the density ) of the ' charged ', or compressed air from the turbo, thereby increasing the amount of fuel that can be injected and combusted. These, in combination, allow for greater engine efficiency, and therefore greater power outputs ( from a more complete combustion process compared to indirect injection ), while also decreasing emissions and providing more torque than the non-turbo and non-direct injection petrol engined counterpart from VAG. Similar technology has been used by other automotive companies, but `` TDI '' specifically refers to these Volkswagen Group engines. Naturally aspirated direct - injection diesel engines ( those without a turbocharger ) made by Volkswagen Group use the Suction Diesel Injection ( SDI ) label. Because these engines are relatively low displacement and quite compact, they have a low surface area. The resulting reduced surface area of the direct injection diesel engine reduces heat losses, and thereby increases engine efficiency, at the expense of slightly increased combustion noise. A direct injection engine is also easier to start when cold, because of more efficient placing and usage of glowplugs. Direct injection turbodiesel engines are frequent winners of various prizes in the International Engine of the Year Awards. In 1999 in particular, six out of twelve categories were won by direct injection engines : three were Volkswagen, two were BMW, and one Audi. Notably that year, the Volkswagen Group 1.2 TDI 3 L beat the Toyota Prius to win `` Best Fuel Economy '' in its class. The TDI engine has won `` Green Car of the Year '' award in the years 2009 ( Volkswagen Jetta 2.0 - litre common - rail TDI clean diesel ) and 2010 ( Audi A3 TDI clean diesel ) beating other various electric cars. History The Fiat Croma The first passenger car to be powered by direct injection was the 1986 Fiat Croma 2.0 TD i.d. ( The Turbo Diesel iniezione diretta pump was developed by Bosch in accordance with Fiat 's engineering specifications ). Rover introduced its MDI turbocharged direct injection diesel developed with Perkins, ( also known as the Perkins Prima ) in 1988 in the Rover Montego. It was also sold in marine form by Volvo. It used a Bosch VE injection pump. The engine had been launched in naturally aspirated form for commercial vehicles in 1986. The first Volkswagen Group TDI engine was the Audi - developed 2.5 - litre R5 TDI -- an inline five - cylinder engine ( R5 ), introduced in the Audi 100 in 1989 -- and this variant is still used today in Volkswagen Marine applications. The TDI arrangement has been enhanced through various stages of development -- by improving the efficiency of the turbocharger, increasing the pressure at which fuel can be injected, and more precisely timing when the injection of fuel takes place. There have been a few major ' generations ', starting with what are known as `` VE '', and `` VP '' ( German : VerteilerPumpe ) engines, which use a distributor - type injection pump. In 2000, the Pumpe Düse ( PD, variously translated `` pump nozzle '', `` unit injector '', `` pump injector '' ) TDI engine began to appear in Europe, eventually coming to North America a few years later. The Pumpe Düse design was a reaction to the development of high - pressure common rail fuel injection systems by competitors -- an attempt by Volkswagen Group to create an in - house technology of comparable performance that would not require any royalties to be paid. While Pumpe Düse engines had a significantly higher injection pressure than older engines, they are slightly less refined when compared to the very latest common rail and, with the original solenoid - operated unit injectors, were not able to control injection timing as precisely ( a major factor in improving emissions ). Some current PD TDI engines now use piezoelectric unit injectors, allowing far greater control of injection timing and fuel delivery. From the 2009 model year onwards, TDI engines using the common rail ( CR ) technique, again with piezoelectric injectors, are now used in various Volkswagen Group models. The CR engines are available in many sizes, including 1.2, 1.6, 2.0, 2.7, 3.0, 4.2 and 6.0 litres, with outputs from 55 to 368 kW ( 75 to 500 PS ) from these engines. Emissions testing falsification Main article : Volkswagen emissions scandal On 18 September 2015 the US EPA and California Air Resources Board served notice to VW that approximately 480,000 VW and Audi automobiles equipped with 2.0 TDI engines sold in the US between 2009 and 2015 had an emissions compliance defeat device installed. The defeat device, in the form of specially crafted engine management unit firmware, detects emissions testing conditions, and in such conditions will cause the vehicle to comply with emissions regulations by properly activating all emissions controls. However, under normal driving conditions, the emissions controls are suppressed, allowing the engine to produce more torque and get better fuel economy, at the expense of emitting up to 40 times more nitrogen oxides than allowed by law. Such NOx emission levels are not in compliance with US regulations. VW has since admitted to these allegations, and said that the illegal software was in use in its diesel cars worldwide, affecting some 11 million vehicles. Audi R10 TDI LMP race car SEAT León Mk2 TDI race car Motor racing A motor racing version of the common rail TDI engine made an impact in March 2006 when it was used in the Le Mans Prototype ( LMP ) Audi R10 TDI, and made its debut win in the 12 Hours of Sebring race. This victory was followed three months later by another one in the 24 Hours of Le Mans race, becoming the first diesel - powered car to win these prestigious endurance races. Fuel economy was a significant factor, as the car did not have to refuel as often as petrol engined race cars in the race. The car was fueled with a special synthetic V - Power diesel from Shell. The Audi R10, R15 and R18 TDIs have won at Le Mans seven times in eight years, from 2006 to 2011, with only the 2009 race being won by Peugeot 's 908 HDi FAP, which is also a diesel powered car. In 2007, SEAT -- with the León Mk2 TDI at the Motorsport Arena Oschersleben in Germany -- became the first manufacturer to win a round of the World Touring Car Championship ( WTCC ) series in a diesel car, only a month after announcing it will enter the FIA World Touring Car Championship with the León TDI. SEAT 's success with the León TDI was continued, and resulted in winning consecutively 2008 World Touring Car Championship and 2009 World Touring Car Championship both titles ( for drivers as well as for manufacturers ). In 2008, SEAT -- with the León Mk2 TDI at Donington Park in England -- became the first manufacturer to win a round of the British Touring Car Championship ( BTCC ) in a diesel - powered car. Jason Plato won race 1 of the weekend and Darren Turner won race 3. Fuel The fuels required for TDI engines include diesel fuel ( also known as petrodiesel ), or B5, B20, or B99 biodiesel, depending on emissions equipment, location dependent. A 2007 Volkswagen Jetta Mk5 with a 1.9 TDI engine and a five - speed manual transmission achieves 5.2 litres per 100 kilometres ( 54 mpg ; 45 mpg ) on the European combined - cycle test ( a US EPA test of the same vehicle would achieve around 34 MPG ), while a six - speed direct - shift gearbox ( DSG ) automatic version reaches 5.9 litres per 100 kilometres ( 48 mpg ; 40 mpg ). Newer TDI engines, with higher injection pressures, are less forgiving of poor - quality fuel than their 1980s ancestors. Volkswagen Group 's warranty does not cover damage due to bad fuel ( diesel or bio ), and has in the past recommended that only mixtures up to 5 % biodiesel ( B5 ) be used. Volkswagen Group has recently permitted mixes up to B20, and has recommended B5 be used in place of 100 % petroleum - based diesel because of biodiesel 's improved lubricating properties. In North America, No. 2 diesel fuel is recommended, since it has a higher cetane number than No. 1 fuel, and has lower viscosity ( better ability to flow ) than heavier fuel oils. Some owners in North America, where cetane levels are generally poor ( as low as 40 ), use additives, or premium diesel, to get cetane numbers closer to the standard levels found in the European market ( at least 51 ) where the engine is designed. Improved cetane reduces emissions while improving performance, and may increase fuel economy. New ultra low - sulphur petroleum - only diesels are known to cause some seals to shrink, and may cause fuel pump failures in TDI engines used in 2006 to 2009 models. TDI engines from 2009 on and before 2006 are designed to use ULSD exclusively ; biodiesel blends are reported to prevent that failure. See also SDI ( engine ) Diesel engine Turbodiesel Common rail Diesel automobile racing List of Volkswagen Group diesel engines References ^ Jump up to : `` Technology -- TDI -- Super-efficient diesel engines for power with economy ''. Volkswagen.co.uk. Volkswagen UK. 2010. Retrieved 4 March 2010. ^ Jump up to : `` Volkswagen AG -- TDI Technical Glossary ''. Volkswagen.com. Volkswagen AG. Retrieved 5 November 2009. Jump up ^ `` TB 20 addendum -- Technical Bulletin for Volkswagen Group timing belt renewal intervals '' ( PDF ). Gates.com. Retrieved 4 November 2009. Jump up ^ `` Volkswagen Marine > Engines < ''. www.vw-m.de. Volkswagen Group. 2009. Archived from the original on 19 July 2011. Retrieved 4 November 2009. Jump up ^ `` Boat engines from Volkswagen Marine -- Self - study programme M001 -- Design and function '' ( PDF ). www.vw-m.de. Volkswagen Marine. April 2001. Archived from the original ( PDF ) on 19 July 2011. Retrieved 18 February 2010. Jump up ^ `` Boat engines from Volkswagen Marine -- Self - study programme M002 -- Design and Operation '' ( PDF ). www.vw-m.de. Volkswagen Marine. August 2006. Archived from the original ( PDF ) on 19 July 2011. Retrieved 18 February 2010. Jump up ^ `` The SDI 1.9 Industrial Engine '' ( PDF ), www.mi-uk.com, Volkswagen AG, March 2005, archived from the original ( PDF ) on 14 July 2011, retrieved 4 November 2009 ^ Jump up to : Phillip A. Brooks ( 18 September 2015 ). `` VW Notice of Violation, Clean Air Act ( 18 September 2015 ) '' ( PDF ). US Environmental Protection Agency. Retrieved 20 September 2015. ^ Jump up to : `` EPA, California Notify Volkswagen of Clean Air Act Violations ''. US Environmental Protection Agency. 18 September 2015. Retrieved 20 September 2015. ^ Jump up to : Jack Ewing and Coral Davenport ( 20 September 2015 ). `` Volkswagen to Stop Sales of Diesel Cars Involved in Recall ''. New York Times. Retrieved 21 September 2015. ^ Jump up to : `` Volkswagen Says 11 Million Cars Worldwide Are Affected in Diesel Deception ''. The New York Times. 22 September 2015. Retrieved 22 September 2015. Jump up ^ TDI engines - Operation of these engines. Jump up ^ `` Self - study programme 316 The 2.0 ltr. ( sic ) TDI engine '' ( PDF ). Volkswagen AG. Jump up ^ `` 12 Hours of Sebring ''. Audi Canada website. Audi Canada. Retrieved 11 January 2013. Jump up ^ `` 2006 Audi R10 ''. topspeed.com car reviews. TopSpeed.com. Retrieved 11 January 2013. Jump up ^ `` Bosch Clean Diesel Helps Audi Dominate American Le Mans Series ''. Bosch website. Bosch NA. Retrieved 11 January 2013. Jump up ^ Richards, Giles ( 17 June 2012 ). `` Audi is first manufacturer to take Le Mans 24 Hours race with hybrid ''. guardian.co.uk website. London : The guardian. Retrieved 11 January 2013. Jump up ^ `` Audi R10 TDI -- a history maker ''. Audi UK website. audi.co.uk. Retrieved 11 January 2013. Jump up ^ `` Audi on course for a 10th victory ? ''. Auto News -- Site officiel du Mans. Lemans.org. Retrieved 11 January 2013. Jump up ^ `` 2006 Audi R10 ''. Stories by Audi, edited by Supercars.net. Supercars.net. Retrieved 11 January 2013. Jump up ^ `` Shell V - Power Diesel race fuel takes Audi R10 TDI to historic victory at Sebring ''. Shell website. Shell. Retrieved 11 January 2013. Jump up ^ `` ROUNDS 15 & 16 -- OSCHERSLEBEN, GERMANY RACE 1 REPORT '' ( PDF ). WTCC Beru Race of Germany -- Motorsport Arena, Oschersleben -- 25 / 26 August 2007. FIA World Touring Car Championship. Retrieved 12 January 2013. Jump up ^ `` First victory for SEAT León TDI ''. SEAT motorsport. www.volkswagen-group-motorsport.info. Retrieved 12 January 2013. Jump up ^ `` SEAT Leon TDI : A double - double world champion ''. WTCC season review. London : The guardian. 18 December 2009. Retrieved 12 January 2013. Jump up ^ `` Year by year SEAT 's racing history ''. SEAT sport website. SEAT sport. Archived from the original on 13 March 2012. Retrieved 12 January 2013. Jump up ^ `` BTCC race reports 04 / May / 2008 ''. BTCC Donington Park. BTCC. Retrieved 12 January 2013. Jump up ^ `` Jetta engines ''. Volkswagen Passenger Cars. Retrieved 2007 - 06 - 04. Jump up ^ `` Biodiesel FAQ ''. Retrieved 2008 - 01 - 28. Jump up ^ Chevron paper Archived February 29, 2008, at the Wayback Machine. External links Wikimedia Commons has media related to Volkswagen engines. VolkswagenAG.com -- Volkswagen Group corporate website Volkswagen Group Ownership Porsche SE State of Lower Saxony Qatar Holding LLC Capital Group Companies Divisions and subsidiaries Passenger cars Audi ( 99.55 % ) Audi Sport Bentley Motors Bugatti Lamborghini Porsche SEAT Škoda Volkswagen Commercial vehicles MAN Truck & Bus Navistar International ( 16.6 % ) Scania Volkswagen Caminhões e Ônibus Volkswagen Commercial Vehicles Motorcycles Ducati Engines MAN Diesel & Turbo Services Italdesign Giugiaro Geographic Volkswagen Group of America ( Electronics Research Laboratory ) Volkswagen do Brasil Volkswagen Group China Volkswagen Group Sales India Shareholdings FAW - Volkswagen ( 40 % ) Here ( 33.3 % ) IAV ( 50 % ) MAN ( 75.56 % ) Navistar International ( 16.6 % ) SAIC Volkswagen ( 50 % ) Products and technologies Platforms Vehicles Engines Diesel : current / discontinued Petrol : current / discontinued North America Technologies BlueMotion Digifant DSG ETKA FSI Pumpe Düse SDI TDI VAG - COM Discontinued brands Auto Union DKW Horch NSU Wanderer Places Autostadt Ehra - Lessien Factories People Ferdinand Porsche ( founder ) Carl Hahn ( Chairman Emeritus ) Ivan Hirst ( former Managing Director ) Rudolf Leiding ( former CEO ) Kurt Lotz ( former CEO ) Heinrich Nordhoff ( former Managing Director ) Ferdinand Piëch ( Chairman of the Supervisory Board ) Bernd Pischetsrieder ( former CEO ) Toni Schmücker ( former CEO ) Martin Winterkorn ( former Chairman of the Board of Management ) Porsche family ( owner ) Motorsport Teams : Rally teams Series : Formula Volkswagen Germany Jetta TDI Cup Scirocco R - Cup Other Volkswagen emissions testing scandal Commons Retrieved from `` https://en.wikipedia.org/w/index.php?title=Turbocharged_direct_injection&oldid=839437007 '' Categories : Volkswagen Group engines Diesel engines Turbochargers Engine technology Fuel injection systems Marine engines Hidden categories : All articles with dead external links Articles with dead external links from November 2009 Webarchive template wayback links All articles with unsourced statements Articles with unsourced statements from April 2012 Articles containing German - language text Articles with unsourced statements from April 2008 All articles lacking reliable references Articles lacking reliable references from September 2012 Articles with unsourced statements from September 2012 Articles with unsourced statements from October 2015 Talk Contents About Wikipedia Български Čeština Dansk Deutsch Español Français Bahasa Indonesia Italiano Nederlands Polski Português Slovenčina Slovenščina Српски / srpski Türkçe Українська 7 more Edit links This page was last edited on 3 May 2018, at 12 : 23 ( UTC ). 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Question: what does tdi stand for in vw jetta
Answer: Turbocharged direct injection