TDI (engine)

Turbocharged Direct Injection, or TDI, is a name Volkswagen and its partner companies use for a certain type of diesel engine. These engines use a highly-pressurized fuel rail (over 2,000 bar/29,000 PSI) and intercooler to enhance the power gained from turbocharging an engine.[1][2] These engines could be found in inline three, four, and five configurations, as well as V6, V8, and V10 configurations.[3][4][5][6]

TDI engines have become controversial recently. This is because some TDI engines used a system to under-report their emissions of harmful gases during testing (at the cost of some performance and fuel economy), but were not sold in the emissions-defeating mode, which was a more powerful and efficient fine-tuning of the engine at the cost of more harmful emissions. This meant that the engine could put out up to forty times more nitrogen oxides than was legally allowed.[7]

References

  1. ↑ "TDI | VW Diesel Engines | Volkswagen UK". www.volkswagen.co.uk. Retrieved 2025-07-29.
  2. ↑ "news: Volkswagen introducing new EA288 diesel engine". dieselnet.com. Retrieved 2025-07-29.
  3. ↑ "Volkswagen Phaeton V10 TDI". MotorTrend. 2003-09-29. Retrieved 2025-07-29.
  4. ↑ "List of VW/Audi Engines - Specifications, Problems, Maintenance Info". www.motorreviewer.com. Retrieved 2025-07-29.
  5. ↑ "4.2 TDI Engine - In-Depth Look at Design and Reliability". MotorReviewer - In-Depth Engine Reviews. Retrieved 2025-07-29.
  6. ↑ "2.5 R5 TDI Engine - In-Depth Look at Design and Reliability". MotorReviewer - In-Depth Engine Reviews. Retrieved 2025-07-29.
  7. ↑ Adeoti, 'Tosin (2025-05-29). "Dieselgate: How Volkswagen Engineered a Lie". Medium. Retrieved 2025-07-29.


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