The Audi TT Roadster (8J) 1.8 TFSI, produced from June 2008 to 2010, represented a compelling entry point into the second-generation TT range. Positioned as a more accessible alternative to the higher-performance 2.0 TFSI and 3.2 V6 models, this variant offered a blend of sporty styling, reasonable performance, and improved fuel efficiency. It was built on the Volkswagen Group’s A5 (or B7) platform, also known as the 1HX0 for the Roadster, and aimed to broaden the TT’s appeal to a wider customer base. This model catered to buyers seeking the TT’s iconic design and open-top driving experience without the higher price tag and running costs associated with the more powerful engines.
Technical Specifications
| Brand | Audi |
| Model | TT |
| Generation | TT Roadster (8J) |
| Type (Engine) | 1.8 TFSI (160 Hp) |
| Start of production | June, 2008 |
| End of production | 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Roadster |
| Seats | 2 |
| Doors | 2 |
| Fuel consumption (urban) | 9.1 l/100 km (25.8 US mpg, 31 UK mpg, 11 km/l) |
| Fuel consumption (extra urban) | 5.6 l/100 km (42 US mpg, 50.4 UK mpg, 17.9 km/l) |
| Fuel consumption (combined) | 6.9 l/100 km (34.1 US mpg, 40.9 UK mpg, 14.5 km/l) |
| CO2 emissions | 161 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 7.4 sec |
| Acceleration 0 – 62 mph | 7.4 sec |
| Acceleration 0 – 60 mph | 7 sec (Calculated) |
| Maximum speed | 223 km/h (138.57 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 8 kg/Hp, 124.5 Hp/tonne |
| Weight-to-torque ratio | 5.1 kg/Nm, 194.6 Nm/tonne |
| Power | 160 Hp @ 4500-6200 rpm |
| Power per litre | 89 Hp/l |
| Torque | 250 Nm @ 1500-4500 rpm (184.39 lb.-ft. @ 1500-4500 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | CDAA |
| Engine displacement | 1798 cm3 (109.72 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 82.5 mm (3.25 in.) |
| Piston Stroke | 84.1 mm (3.31 in.) |
| Compression ratio | 9.6:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 4.6 l (4.86 US qt | 4.05 UK qt) |
| Coolant capacity | 8.1 l (8.56 US qt | 7.13 UK qt) |
| Kerb Weight | 1285 kg (2832.94 lbs.) |
| Max. weight | 1605 kg (3538.42 lbs.) |
| Max load | 320 kg (705.48 lbs.) |
| Trunk (boot) space – minimum | 250 l (8.83 cu. ft.) |
| Fuel tank capacity | 55 l (14.53 US gal | 12.1 UK gal) |
| Length | 4178 mm (164.49 in.) |
| Width | 1842 mm (72.52 in.) |
| Height | 1358 mm (53.46 in.) |
| Wheelbase | 2468 mm (97.17 in.) |
| Front track | 1572 mm (61.89 in.) |
| Rear track | 1558 mm (61.34 in.) |
| Drag coefficient (Cd) | 0.32 |
| Minimum turning circle | 10.96 m (35.96 ft.) |
| Drivetrain Architecture | Front wheel drive |
| Number of gears | 6 gears, manual transmission |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 225/55 R16 |
| Wheel rims size | 7.5J x 16 |
Powertrain & Engine Architecture
The heart of the TT Roadster 1.8 TFSI is the CDAA engine code, a 1.8-liter inline-four cylinder engine. This engine utilizes direct fuel injection (FSI) and a single turbocharger with an intercooler to deliver a balance of power and efficiency. The direct injection system allows for precise fuel delivery, improving combustion efficiency and reducing emissions. The turbocharger provides a boost in power, compensating for the relatively small displacement. The engine features a dual overhead camshaft (DOHC) valvetrain with four valves per cylinder, optimizing airflow for increased performance. The 6-speed manual transmission was standard, offering precise gear changes and a more engaging driving experience. While an automatic transmission (specifically a 7-speed S tronic dual-clutch transmission) was available as an option, the manual was more common in this trim level.
Driving Characteristics
The 1.8 TFSI engine, producing 160 horsepower and 184 lb-ft of torque, provided adequate performance for the TT Roadster. Acceleration from 0 to 60 mph took around 7 seconds, making it a reasonably quick car for its class. However, it wasn’t as exhilarating as the 2.0 TFSI or V6 models. The turbocharger did provide a noticeable boost in power, but turbo lag was present, particularly at lower engine speeds. The manual transmission’s gear ratios were well-matched to the engine’s powerband, allowing for spirited driving on winding roads. Compared to the 2.0 TFSI, the 1.8 TFSI felt less urgent in its acceleration, but it offered a more relaxed and fuel-efficient driving experience. The front-wheel-drive configuration provided good traction in most conditions, but could exhibit some torque steer under hard acceleration.
Equipment & Trim Levels
The 1.8 TFSI Roadster typically came with a respectable level of standard equipment. This included features like air conditioning, power windows and locks, a multi-function steering wheel, and a basic audio system. Upholstery was typically cloth, although leather options were available. Optional extras included a premium audio system, navigation system, heated seats, and parking sensors. The interior design was minimalist and driver-focused, characteristic of Audi’s design philosophy at the time. The dashboard featured a clean layout with easy-to-read gauges. The trim level was generally considered the entry-level TT Roadster, offering a more affordable way to experience the TT’s styling and open-top driving experience.
Chassis & Braking
The TT Roadster 1.8 TFSI utilized an independent suspension system, with McPherson struts at the front and a multi-link setup at the rear. This provided a comfortable ride while maintaining good handling characteristics. Stabilizer bars were fitted to both axles to reduce body roll during cornering. The braking system consisted of ventilated discs at the front and solid discs at the rear, providing adequate stopping power. Anti-lock braking system (ABS) was standard. The chassis was relatively lightweight, contributing to the car’s agility and responsiveness.
Market Reception & Comparison
The Audi TT Roadster 1.8 TFSI was generally well-received by automotive critics. It was praised for its stylish design, comfortable ride, and reasonable fuel economy. However, some critics noted that the engine lacked the outright performance of the more powerful TT models. Compared to the 2.0 TFSI, the 1.8 TFSI offered better fuel economy but less power. The 1.8 TFSI was also more affordable than the 2.0 TFSI, making it a more attractive option for budget-conscious buyers. Its fuel economy figures of around 34 mpg combined were competitive for a sports car of its era.
Legacy
The 1.8 TFSI engine proved to be relatively reliable, although regular maintenance is crucial. Common issues include carbon buildup on the intake valves (a characteristic of direct injection engines) and potential turbocharger wear. Today, the TT Roadster 1.8 TFSI represents an affordable entry point into Audi ownership. Well-maintained examples are still relatively common on the used car market. Its combination of stylish design, reasonable performance, and relatively low running costs makes it a popular choice for enthusiasts seeking a fun and engaging roadster experience. The CDAA engine, while not the most powerful in the TT lineup, has proven to be durable and capable when properly maintained, ensuring that these early 8J Roadsters continue to provide driving enjoyment for years to come.
