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The Z4’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 Z4 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.
The Z4’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.
To help make backing safer, the Z4’s optional cross-path warning system uses wide-angle radar in the rear bumper to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The TT doesn’t offer a cross-path warning system.
The Z4’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 Z4 and the TT have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, post-collision automatic braking systems, daytime running lights, rearview cameras and available blind spot warning systems.
BMW pays for scheduled maintenance on the Z4 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 Z4’s warranty.
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.
The Z4 has more powerful engines than the TT:
Z4 sDrive30i 2.0 turbo 4 cyl.
Z4 M40i 3.0 turbo 6 cyl.
TT 45 TFSI 2.0 turbo 4 cyl.
TTS 2.0 turbo 4 cyl.
TT RS Coupe 2.5 turbo 5 cyl.
On the EPA test cycle the Z4 sDrive30i gets better fuel mileage than the TT 45 TFSI (25 city/32 hwy vs. 23 city/31 hwy).
Regenerative brakes improve the Z4’s fuel efficiency by converting inertia back into energy instead of wasting it. The TT doesn’t offer a regenerative braking system.
An eight-speed automatic is standard on the BMW Z4, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the TT.
The Z4’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.
For better traction and acceleration, the Z4 has larger standard rear tires than the TT (255/40R18 vs. 245/40R18). The Z4’s optional rear tires are larger than the largest rear tires available on the TT (275/35R19 vs. 255/30R20).
The Z4 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 better handling and stability, the average track (width between the wheels) on the Z4 is 1.5 inches wider in the front and 2.1 inches wider in the rear than the average track on the TT.
The Z4’s front to rear weight distribution is more even (49.9% to 50.1%) than the TT’s (60.7% to 39.3%). This gives the Z4 more stable handling and braking.
The design of the BMW Z4 amounts to more than styling. The Z4 has an aerodynamic coefficient of drag of .29 Cd. That is lower than the TT (.3 to .32) and many sports cars. A more efficient exterior helps keep the interior quieter and helps the Z4 get better fuel mileage.
The Z4 has a much larger trunk than the TT Roadster (9.9 vs. 7.5 cubic feet).
To make loading groceries and cargo easier when your hands are full, just kicking your foot under the back bumper can open the Z4’s available trunk, 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.
The Z4 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 different drivers share the Z4, the memory system makes it convenient. Each setting activates different, customized memories for the driver and front passenger’s seat positions, outside mirror angle, climate settings and radio stations. The TT doesn’t offer a memory system.
The Z4 offers an optional heads-up display that projects speed 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 Z4 offers an optional remote convertible top that can be raised from a distance to protect the interior of the vehicle from damage. 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 available for the Z4 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 Z4 offers optional adaptive headlights to illuminate around corners automatically by reading vehicle speed and steering wheel angle. The TT doesn’t offer cornering lights.
When the Z4 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 Z4’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 Z4’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.
To keep a safe, consistent following distance, the Z4 offers an optional Adaptive 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 Z4’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.
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