What are the differences between Audi B8 and Audi B9?

[EvelynFitz]

Audi B8 and Audi B9 differ in the following aspects: In terms of body dimensions, the Audi B8 measures 4716mm in length, 1826mm in width, and 1439mm in height; the Audi B9 measures 4818mm in length, 1843mm in width, and 1432mm in height. In terms of transmission, the Audi B8 uses an 8-speed continuously variable transmission, while the Audi B9 uses a 7-speed dual-clutch transmission. In terms of wheelbase, the Audi B8 has a wheelbase of 2869mm, and the Audi B9 has a wheelbase of 2908mm. In terms of engine power, the Audi B8 has a maximum power of 132kw, and the Audi B9 has a maximum power of 140kw. The differences between the Audi B8 and Audi B9 can also be identified by the chassis number: if the chassis number is 8Y, it refers to the Audi B8; if it is 8W, it refers to the Audi B9.

[PaulFitz]

As a seasoned Audi driver with a decade of experience, I've handled both generations. The B8, produced from 2008 to 2015, had a firm chassis but fell short in noise insulation. The most noticeable upgrade in the B9 was the interior—the entire dashboard was redesigned with a floating touchscreen and full digital instrument cluster, creating a futuristic vibe at night. With the new MLB Evo platform, the B9's chassis felt noticeably smoother over speed bumps, and tire noise was significantly reduced. Both used 2.0T engines, but the B9's third-gen EA888 had better thermal efficiency, saving me half a liter of fuel on my daily commute. The headlights were also upgraded; the B9's matrix LEDs automatically dim for oncoming traffic, making night drives much safer. Side by side, the B9's flatter, more aggressive hexagonal grille and stronger character lines stand out. However, be aware that the B9's complex electronics mean higher maintenance costs compared to the B8.

[VonDawson]

Last week I accompanied a friend to compare these two models at a used car market. The B8's cabin space is actually sufficient, but stepping into the B9 immediately feels different – the wheelbase is extended by 12mm, creating two extra fingers' width of knee room in the rear. What impressed me most was the noise insulation improvement; the B9 added double-layer soundproofing cotton to the firewall, reducing highway noise by 5-6 decibels. In terms of handling, the B9 offers more precise steering, and its newly developed five-link suspension provides better cornering support. The biggest gap lies in the infotainment system: the B8 still uses the old rotary knob controls, while the B9 already supports touchscreen and CarPlay. The lighting system has been upgraded from standard LED to 32-unit matrix headlights, significantly improving penetration in rainy or foggy conditions. Trunk capacity remains basically the same, both capable of holding three suitcases. As for drawbacks, the B9's maintenance costs are higher than the B8's – replacing a sensor can cost over 2,000 yuan.

[JosieLee]

At the last Audi brand event, the instructor gave a detailed comparison between these two generations. The B8 used the B8 platform, while the B9 switched to the MLB Evo, reducing the vehicle weight by 65 kg. Although both are equipped with a 2.0T engine, the B9 has better thermal management, with faster water temperature rise during cold starts. The transmission was upgraded from an 8-speed simulated CVT to a 7-speed dual-clutch, making gear shifts much crisper. Active safety was a key upgrade, with the B9 featuring a standard pre-collision system capable of detecting pedestrians. The most noticeable change is in the lighting units—the B9's daytime running lights now have an angular design, offering ultra-high visibility at night. The infotainment system was upgraded from MMI 3G to 4G, with the touchscreen responding three times faster. The air conditioning system now features fully digital controls, allowing independent temperature adjustment for the rear seats.

[StIris]

Just researched this while helping my cousin choose a car. The B9 body uses 18% aluminum alloy, with lightweight front suspension towers. Exterior changes focus on details: the rounded headlights of the B8 have been replaced by the B9's sharp hexagonal ones, and the side mirrors have been moved from the A-pillar to the doors. The interior quality is noticeably improved, with the B9's center console buttons featuring force feedback that produces a crisp clicking sound when pressed. The tech gap is significant—the B9 comes with a panoramic camera and heads-up display, while the older B8 didn't even have standard parking sensors. The B9 offers five driving modes compared to the B8, with three sets of customizable settings. Fuel efficiency is better by 0.8L per 100km in the B9, but maintenance intervals are shortened by 5,000km. In the used car market, the B9 holds its value 15% better, especially models equipped with matrix headlights.

[SanJohnny]

I work in automotive detailing and deal with these two generations of cars every day. The B9 has added Nardo Gray and Daytona Gray to its paint options, with finer metal particles. The exterior components have changed significantly, with sharper angled cuts on the air intakes on both sides of the B9's front bumper. The most challenging part is cleaning—the B9's matrix headlights have 35 cooling vents, requiring a special brush during car washes. The interior cleaning differences are noticeable too; the B9's touchscreen is particularly prone to fingerprints, and the piano black trim shows scratches more easily than the B8's. I recommend B9 owners opt for monthly ceramic coating, especially since the newly designed honeycomb grille tends to accumulate dust. On the upside, the B9 has good modification potential, as its MQB platform can directly support stage 3 ECU tuning. In terms of practicality, the B9's wipers now feature an integrated washer-blade design, which is less likely to freeze in winter.