The Audi A4 (B8 8K) 1.8 TFSI, generating 160 horsepower, was a significant variant within the fourth generation of Audi’s popular compact executive car. Introduced in May 2007 and continuing through 2011, this model held a key position in the A4 lineup, offering a balance between performance, fuel efficiency, and affordability. It was positioned as an upgrade from the base engine options, appealing to buyers desiring a more refined driving experience without the higher cost of the more powerful models like the 2.0 TFSI or the S4. The B8 generation A4 represented a substantial evolution in Audi’s design language and technology, and the 1.8 TFSI played a crucial role in its market success.
Technical Specifications
| Brand | Audi |
| Model | A4 |
| Generation | A4 (B8 8K) |
| Type (Engine) | 1.8 TFSI (160 Hp) |
| Start of production | May, 2007 |
| End of production | 2011 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (economy) – urban | 9.9 l/100 km (23.8 US mpg, 28.5 UK mpg, 10.1 km/l) |
| Fuel consumption (economy) – extra urban | 5.5 l/100 km (42.8 US mpg, 51.4 UK mpg, 18.2 km/l) |
| Fuel consumption (economy) – combined | 7.1 l/100 km (33.1 US mpg, 39.8 UK mpg, 14.1 km/l) |
| CO2 emissions | 169 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.6 sec |
| Acceleration 0 – 62 mph | 8.6 sec |
| Acceleration 0 – 60 mph | 8.2 sec |
| Maximum speed | 225 km/h (139.81 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 8.8 kg/Hp, 113.5 Hp/tonne |
| Weight-to-torque ratio | 5.6 kg/Nm, 177.3 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, Longitudinal |
| Engine Model/Code | EA888 / CDHB |
| 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 | 7 l (7.4 US qt | 6.16 UK qt) |
| Kerb Weight | 1410 kg (3108.52 lbs.) |
| Max. weight | 1960 kg (4321.06 lbs.) |
| Max load | 550 kg (1212.54 lbs.) |
| Trunk (boot) space – minimum | 480 l (16.95 cu. ft.) |
| Trunk (boot) space – maximum | 962 l (33.97 cu. ft.) |
| Fuel tank capacity | 65 l (17.17 US gal | 14.3 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (8%) | 1500 kg (3306.93 lbs.) |
| Permitted trailer load with brakes (12%) | 1300 kg (2866.01 lbs.) |
| Permitted trailer load without brakes | 740 kg (1631.42 lbs.) |
| Permitted towbar download | 80 kg (176.37 lbs.) |
| Length | 4703 mm (185.16 in.) |
| Width | 1826 mm (71.89 in.) |
| Height | 1427 mm (56.18 in.) |
| Wheelbase | 2808 mm (110.55 in.) |
| Front track | 1564 mm (61.57 in.) |
| Rear (Back) track | 1551 mm (61.06 in.) |
| Drag coefficient (Cd) | 0.27 |
| Minimum turning circle (turning diameter) | 11.4 m (37.4 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the front wheels of the vehicle. |
| Drive wheel | Front wheel drive |
| Number of gears and type of gearbox | 6 gears, manual transmission |
| Front suspension | Independent multi-link suspension |
| 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 | Electric Steering |
| Tires size | 225/55 R16; 225/50 R17 |
| Wheel rims size | 7.5J x 16; 7.5J x 17 |
Powertrain & Engine Architecture
The heart of the A4 1.8 TFSI is the EA888 engine, specifically the CDHB variant. This 1.8-liter inline-four engine utilizes direct fuel injection (FSI) and a single turbocharger with an intercooler. Direct injection allows for precise fuel delivery, improving efficiency and power output. The turbocharger boosts performance by forcing more air into the engine, increasing horsepower and torque. The engine’s DOHC (Dual Overhead Camshaft) valvetrain, with four valves per cylinder, further enhances breathing and contributes to its responsive nature. The EA888 engine family was known for its relatively lightweight construction and compact dimensions, aiding in the A4’s balanced handling. The 1.8 TFSI produced 160 horsepower at 4500-6200 rpm and 184 lb-ft of torque between 1500-4500 rpm. The engine was typically paired with a six-speed manual transmission, although a multitronic continuously variable transmission (CVT) was also available as an option.
Driving Characteristics
The 1.8 TFSI-equipped A4 offered a comfortable and refined driving experience. While not as overtly sporty as the higher-powered variants, the 1.8L engine provided adequate acceleration for everyday driving. The turbocharger provided a noticeable boost in power, making overtaking maneuvers relatively effortless. The six-speed manual transmission offered precise shifts, while the optional CVT provided smooth, seamless acceleration. Compared to the 2.0 TFSI, the 1.8 TFSI felt less urgent off the line, but the difference in real-world performance was often minimal for typical commuting and highway driving. The 1.8 TFSI’s lighter weight compared to the 2.0 TFSI also contributed to slightly improved fuel economy and handling balance.
Equipment & Trim Levels
The A4 1.8 TFSI was typically offered in base and Premium trim levels. Standard equipment generally included automatic climate control, power windows and locks, a multi-function steering wheel, and an audio system with CD player. Premium trims added features such as leather upholstery, sunroof, upgraded audio system, and parking sensors. Optional extras included navigation system, Bluetooth connectivity, and advanced driver-assistance systems. Interior upholstery was typically cloth on the base model, with leather available as an upgrade. The dashboard layout was clean and functional, with a focus on ergonomics and ease of use.
Chassis & Braking
The B8 A4 featured a fully independent suspension system, with multi-link setups at both the front and rear. This provided a comfortable ride while maintaining good handling characteristics. The front suspension utilized coil springs and stabilizer bar, while the rear suspension also incorporated a stabilizer bar to reduce body roll. Braking duties were handled by ventilated disc brakes at the front and solid disc brakes at the rear. ABS (Anti-lock Braking System) was standard, providing enhanced braking performance in emergency situations. The A4’s chassis was designed to provide a balance between comfort and handling, making it a capable and enjoyable car to drive on a variety of road surfaces.
Market Reception & Comparison
The Audi A4 1.8 TFSI was generally well-received by automotive critics. It was praised for its refined engine, comfortable ride, and well-appointed interior. Critics noted that the 1.8 TFSI offered a good balance between performance and fuel efficiency, making it a practical choice for everyday driving. Compared to the 2.0 TFSI, the 1.8 TFSI was often seen as a more sensible option for buyers who prioritized fuel economy and affordability. However, some critics felt that the 1.8 TFSI lacked the outright performance of its more powerful sibling. Fuel economy figures were competitive for its class, averaging around 33 mpg combined.
Legacy
The EA888 1.8 TFSI engine proved to be a relatively reliable powertrain, although some owners have reported issues with carbon buildup on the intake valves over time. Regular maintenance, including oil changes and fuel system cleaning, is essential to ensure long-term reliability. Today, the B8 A4 1.8 TFSI remains a popular choice in the used car market, offering a good value proposition for buyers seeking a comfortable, refined, and fuel-efficient compact executive car. Its relatively simple engine design and readily available parts contribute to its continued appeal. While not the fastest or most technologically advanced A4 variant, the 1.8 TFSI represents a sweet spot in the lineup, offering a compelling combination of performance, efficiency, and affordability.
