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The 4 Series Coupe offers optional 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.
The 4 Series Coupe’s optional lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane. The TT doesn’t offer a lane departure warning system.
The 4 Series Coupe offers an optional Side and Top View Cameras 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.
Both the 4 Series Coupe 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 seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, rearview cameras, available all wheel drive and blind spot warning systems.
BMW pays for scheduled maintenance on the 4 Series Coupe for 3 years and 36,000 miles. BMW will pay for oil changes, lubrication and any other required maintenance. Audi only pays for the first scheduled maintenance visit on the TT.
There are over 13 percent more BMW dealers than there are Audi dealers, which makes it easier should you ever need service under the 4 Series Coupe’s warranty.
To reliably power the ignition and other systems and to recharge the battery, the 4 Series Coupe has a standard 210-amp alternator (170-amp - 4 Series Coupe 4 cyl.). The TT’s 140-amp alternator isn’t as powerful.
J.D. Power and Associates rated the 4 Series Coupe first among compact premium cars in their 2018 Initial Quality Study. The TT isn’t in the top three in its category.
J.D. Power and Associates’ 2018 Initial Quality Study of new car owners surveyed provide the statistics that show that BMW vehicles are better in initial quality than Audi vehicles. J.D. Power ranks BMW 11th in initial quality, above the industry average. With 18 more problems per 100 vehicles, Audi is ranked 25th, below the industry average.
J.D. Power and Associates’ 2018 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 8th in reliability, above the industry average. With 14 more problems per 100 vehicles, Audi is ranked 13th.
On the EPA test cycle the 430i Coupe xDrive Auto gets better fuel mileage than the TT RS Coupe Auto (23 city/33 hwy vs. 19 city/29 hwy).
Regenerative brakes improve the 4 Series Coupe’s fuel efficiency by converting inertia back into energy instead of wasting it. The TT doesn’t offer a regenerative braking system.
In heavy traffic or at stoplights the 4 Series Coupe’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. The engine is automatically restarted when the driver gets ready to move again. (Start/Stop isn’t accounted in present EPA fuel mileage tests.) The TT doesn’t offer an automatic engine start/stop system.
The 4 Series Coupe has 1.3 gallons more fuel capacity than the TT (15.8 vs. 14.5 gallons), for longer range between fill-ups.
An eight-speed automatic is standard on the BMW 4 Series Coupe, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the TT.
For better stopping power the 4 Series Coupe’s standard brake rotors are larger than those on the TT:
The 4 Series Coupe’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.
Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires available on the 4 Series Coupe 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.
The 4 Series Coupe has standard front and rear gas-charged shocks for better control over choppy roads. The TT’s suspension doesn’t offer rear gas-charged shocks.
For a smoother ride and more stable handling, the 4 Series Coupe’s wheelbase is 12 inches longer than on the TT (110.6 inches vs. 98.6 inches).
For better handling and stability, the track (width between the wheels) on the 4 Series Coupe is 1.8 inches wider in the rear than the average track on the TT.
The 4 Series Coupe’s front to rear weight distribution is more even (50.2% to 49.8%) than the TT’s (60.7% to 39.3%). This gives the 4 Series Coupe more stable handling and braking.
The design of the BMW 4 Series Coupe amounts to more than styling. The 4 Series Coupe has an aerodynamic coefficient of drag of .29 Cd. That is lower than the TT (.3 to .32). A more efficient exterior helps the 4 Series Coupe go faster and keeps the interior quieter. It also helps the 4 Series Coupe get better fuel mileage.
The 4 Series Coupe has 2.7 inches more front headroom, 1.1 inches more front legroom, 1.7 inches more front shoulder room, 2.3 inches more rear headroom, 4.8 inches more rear legroom and 3.8 inches more rear shoulder room than the TT Coupe.
The 4 Series Coupe has a much larger trunk than the TT Coupe (15.7 vs. 12 cubic feet).
To make loading groceries and cargo easier when your hands are full, the 4 Series Coupe’s available trunk can be opened just by kicking your foot under the back bumper, leaving your hands completely free. The TT doesn’t offer a hands-free gesture to open its trunk, forcing you to put cargo down if your hands are full.
When two different drivers share the 4 Series Coupe, 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 Coupe offers an optional heads-up display that projects speed and other key instrumentation 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 poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The 4 Series Coupe offers available headlight washers to keep headlight output high. The TT doesn’t offer headlight washers.
While driving with high beams on, sensitive light sensors available for the 4 Series Coupe detect other vehicles which could be blinded and automatically switch to low beams. The TT doesn’t offer automatic dimming high beams.
To help drivers see further while navigating curves, the 4 Series Coupe offers optional adaptive headlights to illuminate around corners automatically by reading vehicle speed and steering wheel angle. The TT doesn’t offer cornering lights.
The 4 Series Coupe’s sun-visors swivel front-to-side to block glare from the side windows. The TT’s visors are fixed into the windshield header.
A power rear sunshade is optional in the 4 Series Coupe to help block heat and glare for the rear passengers. The TT doesn’t offer a rear sunshade.
When the 4 Series Coupe is put in reverse, the passenger rearview mirror tilts from its original position. This gives the driver a better view of the curb during parallel parking maneuvers. Shifting out of reverse puts the mirror into its original position. The TT’s mirror doesn’t automatically adjust for backing.
On extremely cold winter days, the 4 Series Coupe’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 Coupe has a standard center folding armrest for the rear passengers. A center armrest helps make rear passengers more comfortable. The TT doesn’t offer a rear seat center armrest.
The 4 Series Coupe’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 Coupe 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 Coupe Automatic 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 Coupe’s optional Parking Assistant can parallel park or back into a parking spot by itself, with the driver only controlling speed with the brake pedal. The TT doesn’t offer an automated parking system.
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 Coupe is available in both rear-wheel drive and all-wheel drive configurations. The TT doesn’t offer a two-wheel drive configuration.
IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the BMW 4 Series Coupe will be $5088 to $12780 less than for the Audi TT.
J.D. Power and Associates rated the 4 Series Coupe third among compact premium cars in owner reported satisfaction. This includes how well the vehicle performs and satisfies its owner’s expectations. The TT isn’t in the top three in its category.
The 4 Series Coupe was chosen as one of Car and Driver’s “Top Ten” in 2014. The TT has never been a Car and Driver “Top Ten” pick.
The 4 Series Coupe was chosen as one of Automobile Magazine’s “All Stars” in 2014. The TT has never been an “All Star.”
The BMW 4 Series outsold the Audi TT by over 24 to one during 2018.
© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.
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