2020 BMW 4 Series Convertible vs. 2019 Maserati GranTurismo Convertible

Detailed Review, Specifications & Comparison

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2019 Maserati GranTurismo Convertible

Available Now!

Safety

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 GranTurismo Convertible doesn't offer collision warning or crash mitigation brakes.

The 4 Series Convertible offers all-wheel drive to maximize traction under poor conditions, especially in ice and snow. The GranTurismo Convertible doesn’t offer all-wheel drive.

The 4 Series Convertible’s lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane. The GranTurismo Convertible doesn’t offer a lane departure warning system.

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

The 4 Series Convertible’s blind spot warning system uses digital cameras monitored by computer to alert the driver to moving objects in the vehicle’s blind spots where the side view mirrors don’t reveal them and moves the vehicle back into its lane. The GranTurismo Convertible doesn’t offer a system to reveal objects in the driver’s blind spots.

To help make backing safer, the 4 Series Convertible’s 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 GranTurismo Convertible doesn’t offer a cross-path warning system.

The 4 Series Convertible has standard BMW Assist, which uses a global positioning satellite (GPS) receiver and a cellular system to remotely unlock your doors if you lock your keys in, help track down your vehicle if it’s stolen or send emergency personnel to the scene if any airbags deploy. The GranTurismo Convertible doesn’t offer a GPS response system, only a navigation computer with no live response for emergencies, so if you’re involved in an accident and you’re incapacitated help may not come as quickly.

Both the 4 Series Convertible and the GranTurismo Convertible have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights and front and rear parking sensors.

Warranty

The 4 Series Convertible’s corrosion warranty is 8 years and unlimited miles longer than the GranTurismo Convertible’s (12/unlimited vs. 4/50,000).

BMW pays for scheduled maintenance on the 4 Series Convertible for 3 years and 36,000 miles. BMW will pay for oil changes, lubrication and any other required maintenance. Maserati doesn’t pay scheduled maintenance for the GranTurismo Convertible.

There are almost 3 times as many BMW dealers as there are Maserati dealers, which makes it much easier should you ever need service under the 4 Series Convertible’s warranty.

Reliability

To reliably power the ignition and other systems and to recharge the battery, the 4 Series Convertible has a standard 170-amp alternator (210-amp - 4 Series Convertible 6 cyl.). The GranTurismo Convertible’s 150-amp alternator isn’t as powerful.

J.D. Power and Associates rated the 4 Series Convertible first among compact premium cars in their 2018 Initial Quality Study. The GranTurismo Convertible isn’t in the top three in its category.

Fuel Economy and Range

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

MPG

4 Series Convertible

RWD

430i 2.0 turbo 4 cyl.

23 city/34 hwy

440i 3.0 turbo 6 cyl.

22 city/29 hwy

AWD

430i 2.0 turbo 4 cyl.

22 city/32 hwy

440i 3.0 turbo 6 cyl.

20 city/28 hwy

GranTurismo Convertible

RWD

4.7 DOHC V8

13 city/20 hwy

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

In heavy traffic or at stoplights the 4 Series Convertible’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 GranTurismo Convertible doesn’t offer an automatic engine start/stop system.

Environmental Friendliness

In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the BMW 4 Series Convertible higher (3 to 7 out of 10) than the Maserati GranTurismo Convertible (1). This means the 4 Series Convertible produces up to 47 pounds less smog-producing pollutants than the GranTurismo Convertible every 15,000 miles.

Transmission and Drivetrain

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

All wheel drive, available in the 4 Series Convertible, provides the best traction for acceleration in wet, dry, and icy conditions. In corners, all wheel drive allows both outside wheels to provide power, balancing the car. This allows for better handling. The Maserati GranTurismo Convertible is not available with all wheel drive.

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 GranTurismo Convertible doesn’t offer run-flat tires.

Suspension and Handling

For better maneuverability, the 4 Series Convertible’s turning circle is 3.3 feet tighter than the GranTurismo Convertible’s (37.1 feet vs. 40.4 feet). The 4 Series Convertible xDrive’s turning circle is 1.7 feet tighter than the GranTurismo Convertible’s (38.7 feet vs. 40.4 feet).

Chassis

The BMW 4 Series Convertible may be more efficient, handle and accelerate better because it weighs about 50 to 350 pounds less than the Maserati GranTurismo Convertible.

The 4 Series Convertible is 10.6 inches shorter than the GranTurismo Convertible, making the 4 Series Convertible easier to handle, maneuver and park in tight spaces.

The 4 Series Convertible’s standard power retractable hardtop allows a seamless transition from an open car, to a completely sealed coupe. The GranTurismo Convertible doesn’t offer a retractable hardtop.

Passenger Space

The 4 Series Convertible has 5 cubic feet more passenger volume than the GranTurismo Convertible (90 vs. 85).

The 4 Series Convertible has 1.4 inches more front headroom, 1.1 inches more front shoulder room, 1.3 inches more rear headroom and .9 inches more rear shoulder room than the GranTurismo Convertible.

Cargo Capacity

The 4 Series Convertible has a much larger trunk with its top down than the GranTurismo Convertible (7.8 vs. 6.1 cubic feet). The 4 Series Convertible has a much larger trunk with its top up than the GranTurismo Convertible (13.1 vs. 6.1 cubic feet).

The 4 Series Convertible’s standard rear seats fold to accommodate long and bulky cargo. The GranTurismo Convertible doesn’t offer folding rear seats.

To make loading groceries and cargo easier when your hands are full, the 4 Series Convertible’s available trunk can be opened just by kicking your foot under the back bumper, leaving your hands completely free. The GranTurismo Convertible doesn’t offer a hands-free gesture to open its trunk, forcing you to put cargo down if your hands are full.

Ergonomics

The 4 Series Convertible 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 GranTurismo Convertible doesn’t offer a heads-up display.

The 4 Series Convertible’s front and rear power windows all open or close fully with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside the car. The GranTurismo Convertible’s rear power window switches have to be held the entire time to open or close them fully.

If the windows are left open on the 4 Series Convertible the driver can close them all at the outside door handle. On a hot day the driver can lower the windows at the outside door handle or from a distance using the keyless remote. The driver of the GranTurismo Convertible can’t use the remote to operate the windows.

Comfort Access standard on the 4 Series Convertible allows you to unlock the driver’s door, trunk and start the engine all without removing a key from pocket or purse. This eliminates searching for keys before loading groceries, getting in the vehicle in bad weather or making a hurried start to your trip. The Maserati GranTurismo Convertible doesn’t offer an advanced key system.

Heated windshield washer nozzles are standard on the 4 Series Convertible to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The GranTurismo Convertible doesn’t offer heated windshield washer nozzles.

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

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 GranTurismo Convertible doesn’t offer an adaptive cruise control.

The 4 Series Convertible’s standard steering wheel mounted cruise control is close at hand. The GranTurismo Convertible’s standard cruise control is on an over-crowded turn signal stalk.

The 4 Series Convertible’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 GranTurismo Convertible doesn’t offer an automated parking system.

Model Availability

The BMW 4 Series comes in coupe, convertible and four-door hatchback bodystyles; the Maserati GranTurismo isn’t available as a coupe or four-door.

Recommendations

The 4 Series Convertible was chosen as one of Car and Driver’s “Top Ten” in 2014. The GranTurismo Convertible has never been a Car and Driver “Top Ten” pick.

The 4 Series Convertible was chosen as one of Automobile Magazine’s “All Stars” in 2014. The GranTurismo Convertible has never been an “All Star.”

© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.

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