Compare the2024 BMW 4 Series ConvertibleVS 2023 Audi TT

Safety
Warranty
Reliability
Engine
Fuel Economy and Range
Environmental Friendliness
Transmission
Brakes and Stopping
Tires and Wheels
Suspension and Handling
Passenger Space
Cargo Capacity
Servicing Ease
Ergonomics
Model Availability
Recommendations

Safety

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The 4 Series Convertible’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The TT doesn’t offer pre-crash pretensioners.

The 4 Series Convertible has standard front and rear seat tall, head-protecting side-impact airbags, which act as a forgiving barrier between the passengers and the door. Combined with high-strength steel door beams this system increases protection from broadside collisions. The TT doesn't offer rear-seat side-impact airbags, only ones for front seat occupants.

The 4 Series Convertible has standard City Collision Mitigation, which use forward mounted sensors to warn the driver of a possible collision ahead. If the driver doesn’t react and the system determines a collision is imminent, it automatically applies the brakes at full-force in order to reduce the force of the crash or avoid it altogether. The TT doesn't offer collision warning or crash mitigation brakes.

Over 200 people are killed each year when backed over by motor vehicles. The 4 Series Convertible offers an optional Active Park Distance Control that uses rear sensors to monitor for objects to the rear and automatically applies the brakes to prevent a collision. The TT doesn’t offer backup collision prevention brakes.

The 4 Series Convertible’s lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane and gently nudges the vehicle back towards its lane. The TT doesn’t offer a lane departure warning system.

The 4 Series Convertible offers an optional Surround View to allow the driver to see objects all around the vehicle on a screen. The TT only offers a rear monitor and front and rear parking sensors that beep or flash a light. That doesn’t help with obstacles to the sides.

To help make backing out of a parking space safer, the 4 Series Convertible’s standard Cross Traffic Warning uses sensors in the rear to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The TT doesn’t offer a rear cross-path warning system.

The 4 Series Convertible’s driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The TT doesn’t offer a driver alert monitor.

Both the 4 Series Convertible and the TT have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front and rear seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, post-collision automatic braking systems, daytime running lights, blind spot warning systems, rearview cameras and available all wheel drive.

The BMW 4 Series Convertible weighs 523 to 1095 pounds more than the Audi TT. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.

Warranty

BMW pays for scheduled maintenance on the 4 Series Convertible for 3 years and 36,000 miles. BMW will pay for oil changes, tire rotations, air filter replacements, cabin filter replacement, brake fluid replacement, inspections, and any other required maintenance. Audi only pays for the first scheduled maintenance visit on the TT.

There are over 15 percent more BMW dealers than there are Audi dealers, which makes it easier should you ever need service under the 4 Series Convertible’s warranty.

Reliability

A reliable vehicle saves its owner time, money and trouble. Nobody wants to be stranded or have to be without a vehicle while it’s being repaired. Consumer Reports rates the 4 Series Convertible’s reliability 28 points higher than the TT.

J.D. Power and Associates rated the 4 Series Convertible third among compact premium cars in their 2023 Initial Quality Study. The TT isn’t in the top three in its category.

J.D. Power and Associates’ 2023 Initial Quality Study of new car owners surveyed provide the statistics that show that BMW vehicles are better in initial quality than Audi vehicles. With 29 fewer problems per 100 vehicles, JD Power ranks BMW higher than Audi.

J.D. Power and Associates’ 2022 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that BMW vehicles are more reliable than Audi vehicles. J.D. Power ranks BMW above average in long-term dependability. With 5 more problems per 100 vehicles in the first three years of ownership, Audi is rated below average.

From surveys of all its subscribers, Consumer Reports’ January 2023 Auto Issue reports that BMW vehicles are more reliable than Audi vehicles. Consumer Reports ranks BMW third in overall reliability. Audi is ranked 6th.

Engine

The 430i Convertible’s standard 2.0 turbo 4-cylinder produces 27 more horsepower (255 vs. 228) and 37 lbs.-ft. more torque (295 vs. 258) than the TT 45 TFSI’s standard 2.0 turbo 4-cylinder. The 430i Convertible’s 2.0 turbo 4-cylinder produces 15 lbs.-ft. more torque (295 vs. 280) than the TTS’ standard 2.0 turbo 4-cylinder. The M440i Convertible’s standard 3.0 turbo 6-cylinder hybrid produces 94 more horsepower (382 vs. 288) and 89 lbs.-ft. more torque (369 vs. 280) than the TTS’ standard 2.0 turbo 4-cylinder.

Fuel Economy and Range

On the EPA test cycle the 4 Series Convertible gets better mileage than the TT:

			MPG
4 Series Convertible
	RWD	2.0 turbo 4-cyl.	25 city/34 hwy
		3.0 turbo 6-cyl. Hybrid	23 city/31 hwy
	AWD	2.0 turbo 4-cyl.	23 city/33 hwy
TT
	AWD	TTS 2.0 turbo 4-cyl.	23 city/31 hwy
		2.0 turbo 4-cyl.	23 city/30 hwy

Regenerative brakes improve the 4 Series Convertible’s fuel efficiency by converting inertia back into energy instead of wasting it. The TT doesn’t offer a regenerative braking system.

Regardless of its engine, the 4 Series Convertible’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. If the conditions warrant or the driver wishes, the system can be manually disabled at any time for the duration of a trip. The TT RS doesn’t offer an automatic engine start/stop system.

The 4 Series Convertible has 1.1 gallons more fuel capacity than the TT (15.6 vs. 14.5 gallons), for longer range between fill-ups.

Environmental Friendliness

In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the BMW 4 Series Convertible higher (5 to 7 out of 10) than the Audi TT (3 to 7). This means the 4 Series Convertible produces up to 24.5 pounds less smog-producing pollutants than the TT every 15,000 miles.

Transmission

An eight-speed automatic is standard on the BMW 4 Series Convertible, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the TT.

Brakes and Stopping

For better stopping power the 4 Series Convertible’s brake rotors are larger than those on the TT:

	4 Series Convertible	4 Series Convertible M440i	TT 45 TSFI	TTS Coupe
Front Rotors	13 inches	13.7 inches	12.3 inches	13.3 inches
Rear Rotors	13 inches	13.6 inches	11.8 inches	12.2 inches

The 4 Series Convertible’s standard front and rear disc brakes are vented to help dissipate heat for shorter stops with less fading. The rear discs standard on the TT 45 TSFI are solid, not vented.

Tires and Wheels

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires standard on the 4 Series Convertible can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The TT doesn’t offer run-flat tires.

Suspension and Handling

For a smoother ride and more stable handling, the 4 Series Convertible’s wheelbase is 13.6 inches longer than on the TT (112.2 inches vs. 98.6 inches).

For better handling and stability, the track (width between the wheels) on the 4 Series Convertible is .4 inches wider in the front and 1.6 inches wider in the rear than on the TT.

Passenger Space

Because it has more passenger and cargo room, the EPA rates the 4 Series Convertible a Subcompact car, while the TT Roadster is rated a Two Seater.

The 4 Series Convertible has standard seating for 4 passengers; the TT Roadster can only carry up to 2.

The 4 Series Convertible has 10 cubic feet more passenger volume than the TT (84 vs. 74).

Cargo Capacity

The 4 Series Convertible has a much larger trunk with its top down than the TT Roadster (10.6 vs. 7.5 cubic feet).

A low lift-over trunk design makes loading and unloading the 4 Series Convertible easier. The 4 Series Convertible’s trunk lift-over height is 26.5 inches, while the TT Roadster’s liftover is 32.1 inches. The TT Coupe’s liftover is 32.5 inches.

With its convertible body style, valet key, locking rear seatbacks and remote trunk release lockout, the 4 Series offers cargo security. The TT’s non-lockable folding seat and non-lockable remote release defeat cargo security.

To make loading and unloading groceries and cargo easier, especially for short adults, the 4 Series Convertible offers an optional power trunk, which opens and closes automatically by pressing a button, or optionally by just waving your foot, completely leaving your hands free. The TT doesn’t offer a power trunk.

Servicing Ease

J.D. Power and Associates surveys of service recipients show that BMW service is better than Audi. J.D. Power ranks BMW 7th in service department satisfaction (above the industry average). With a 1% lower rating, Audi is ranked 8th.

Ergonomics

The 4 Series Convertible offers a remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The TT doesn’t offer a remote starting system.

When two different drivers share the 4 Series Convertible, the memory system makes it convenient for both. Each setting activates different, customized memories for the driver’s seat position, outside mirror angle, climate settings and radio stations. The TT doesn’t offer a memory system.

The 4 Series Convertible offers an optional heads-up display that projects speed, tachometer, warning and navigation instruction readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The TT doesn’t offer a heads-up display.

In case of a sudden change of weather, the 4 Series Convertible offers an optional remote convertible top that can be raised from a distance to protect the interior of the vehicle from damage. On a hot day the 4 Series Convertible offers an optional remote opening feature, to lower the top from outside. The TT doesn’t offer a remote top, so the driver will have to run to the car, get in, turn the ignition on and raise the top to prevent the interior from being damaged.

While driving with high beams on, sensitive light sensors standard on the 4 Series Convertible detect other vehicles which could be blinded and automatically switch to low beams. The TT doesn’t offer automatic dimming high beams.

The TT’s cornering lamps activate a lamp on the front corner when the turn signal is activated. The 4 Series Convertible’s optional adaptive cornering lights turn the actual headlight unit up to several degrees, depending on steering wheel angle and vehicle speed. This lights a significant distance into corners at any speed.

Optional air-conditioned seats in the 4 Series Convertible keep the driver and front passenger comfortable and take the sting out of hot seats in Summer. The TT doesn’t offer air-conditioned seats.

On extremely cold winter days, the 4 Series Convertible’s optional heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the car heater warms up. The TT doesn’t offer a heated steering wheel.

The 4 Series Convertible’s standard dual zone air conditioning allows the driver and front passenger to choose two completely different temperatures so people with different temperature preferences won’t have to compromise. This makes both the driver and front passenger as comfortable as possible. The TT doesn’t offer dual zone air conditioning.

For greater rear passenger comfort, the 4 Series Convertible has standard rear a/c vents to keep rear occupants more comfortable. The TT doesn’t offer rear vents.

To keep a safe, consistent following distance, the 4 Series Convertible offers an optional Active Cruise Control, which alters the speed of the vehicle without driver intervention. This allows the driver to use cruise control more safely without constantly having to disengage it when approaching slower traffic. The TT doesn’t offer an adaptive cruise control.

The 4 Series Convertible’s optional Parking Assistant Plus can parallel park or back into a parking spot by itself, starting, stopping and changing direction automatically. The TT doesn’t offer an automated parking system.

Model Availability

The BMW 4 Series comes in coupe, convertible and four door hatchback bodystyles; the Audi TT isn’t available as a four door.

The 4 Series Convertible is available in both rear-wheel drive and all-wheel drive configurations. The TT doesn’t offer a two-wheel drive configuration.

Recommendations

The BMW 4 Series outsold the Audi TT by almost 72 to one during 2022.

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