NHTSA releases advanced notice of proposed rulemaking on V2V, supporting research report
JBEI researchers develop “bionic” liquids: ionic liquids derived from lignin and hemicelullose; towards closed-loop biorefineries

3rd generation Audi TT reduces full lifecycle GHGs by 11% compared to predecessor

Lifecycle greenhouse gas emissions for 2nd and 3rd generation TTs. Click to enlarge.

Audi’s new third-generation TT reduces life-cycle greenhouse gas emissions by 11% compared to its predecessor. This results in a reduction of around 5.5 tonnes of GHGs—CO2, methane, nitrous oxide and halogenated organic emissions—over its entire lifecycle. At the same time, Audi has increased the power output in the new TT by up to 14%.

A number of technologies have contributed towards the positive life cycle assessment of the Audi TT, including lightweight construction. Using an intelligent combination of materials, Audi engineers have, for the second time in a row, succeeded in reducing the car’s unladen weight.

The first model change in 2006 saw weight savings of up to 90 kilograms (198.4 lbs). With the 2.0 TFSI engine variant of the new TT now weighing in at 1,230 kilograms (2,711.7 lbs), this means that the car is once again around 50 kilograms (110.2 lbs) lighter than its predecessor.

Click to enlarge.

The Coupé’s underbody structure has optimized axle loads and is made of modern, high-strength and ultra high-strength steel alloys. In sections of the passenger cell that are subject to high structural stress, form-hardened steel panels are used that are ultra strong and at the same time light—these constitute 17% of the body’s weight.

The side sills and roof frame are made of extruded aluminum profiles, which are integrated into the structure using cast aluminum nodes. This construction principle creates a very rigid and safe bodyshell. The aluminum side sections and roof complete the structure. The hood, doors and tailgate are also made of aluminum.

Top: The materials that are used have a major influence on the results of the life cycle assessment. For example, more energy is consumed when producing light metals such as aluminum and magnesium than for steel; this has the effect of increasing greenhouse gas emissions during their production phase.

Bottom left: MY 2014. Steel and iron materials account for 46% of the second-gen vehicle’s total weight. Light metals, primarily aluminum, make up the second largest proportion, at 26%.

Bottom right: MY2015. The third-generation reduced the percentage of light metals by 6%. The percentage of steel and iron materials has increased accordingly by 4%. The remaining 2% was replaced by polymer. Click to enlarge.

Weight reduction and intelligent lightweight construction measures also have an impact on the vehicle manufacturing process. Here, it has been possible to reduce greenhouse gas emissions by around 9%, or 800 kilograms (1,763.7 lbs).

Audi TT Coupé fuel consumption and GHG comparison
  MY 2014 (Gen 2) MY 2015 (Gen 3)
Model 2.0 TFSI quattro 155 kW S tronic 2.0 TFSI quattro 169 kW S tronic
City 9.9 l/100 km
23.8 mpg US
8.4 – 8.3 l/100 km
28 - 28.3 mpg US
Highway 5.7 l/100 km
41.3 mpg US
5.5 – 5.4 l/100 km
42.8 - 43.6 mpg US
Combined 7.2 l/100 km
32.7 mpg US
6.5 – 6.4 l/100 km
36.2 - 36.8 mpg US
CO2 (comb.) 169 g/km 151-149 g/km



Interesting to see them going back to steel and reducing the amount of light alloys, due to build energy concerns and the availability of ultra high strength steels.

Verify your Comment

Previewing your Comment

This is only a preview. Your comment has not yet been posted.

Your comment could not be posted. Error type:
Your comment has been posted. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.


Post a comment

Your Information

(Name is required. Email address will not be displayed with the comment.)