Certified Benz & Beemer Compares 2007 Porsche 911 VS 2007 Cadillac XLR Near Scottsdale, AZ

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2007 Porsche 911

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VS

2007 Cadillac XLR

Safety Comparison

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The 911 offers all wheel drive to maximize traction under poor conditions, especially in ice and snow. The XLR doesn’t offer all wheel drive.

For better protection of the passenger compartment, the 911 uses safety cell construction with a three-dimensional high-strength frame that surrounds the passenger compartment. It provides extra impact protection and a sturdy mounting location for door hardware and side impact beams. The XLR uses a body-on-frame design, which has no frame members above the floor of the vehicle.

Both the 911 and the XLR have standard driver and passenger frontal airbags, front side-impact airbags, head airbags, front seatbelt pretensioners, four wheel antilock brakes, traction control and electronic stability systems to prevent skidding.

Warranty Comparison

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The 911’s corrosion warranty is 4 years and unlimited miles longer than the XLR’s (10/unlimited vs. 6/100,000).

Engine Comparison

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The 911 has more powerful engines than the XLR:

Horsepower

Torque

911 3.6 DOHC 6 cyl.

325 HP

273 lbs.-ft.

911 S 3.8 DOHC 6 cyl.

355 HP

295 lbs.-ft.

911 Turbo 3.6 6 cyl.

480 HP

460 lbs.-ft.

XLR 4.6 DOHC V8

320 HP

310 lbs.-ft.

XLR V-Series 4.4 supercharged V8

443 HP

414 lbs.-ft.

As tested in Car and Driver the Porsche 911 3.6 is faster than the Cadillac XLR V8 (automatics tested):

911

XLR

Zero to 60 MPH

5.2 sec

5.9 sec

Zero to 100 MPH

12.5 sec

14.4 sec

5 to 60 MPH Rolling Start

5.6 sec

6.3 sec

Passing 50 to 70 MPH

3.5 sec

3.7 sec

Quarter Mile

13.8 sec

14.4 sec

Speed in 1/4 Mile

105 MPH

100 MPH

Top Speed

177 MPH

155 MPH

The flat cylinder configuration of the boxer engine in the 911 lowers its center of gravity, enhancing handling stability. The XLR doesn’t offer a boxer engine configuration.

Fuel Economy and Range Comparison

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On the EPA test cycle the 911/911 S Auto gets better fuel mileage than the XLR (20 city/26 hwy vs. 17 city/27 hwy).

Brakes and Stopping Comparison

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For better stopping power the 911s brake rotors are larger than those on the XLR:

911 S

911 Turbo top.

XLR

XLR V-Series

Front Rotors

12.99 inches

14.96 inches

12.8 inches

13.4 inches

Rear Rotors

12.99 inches

13.78 inches

12 inches

13 inches

The 911’s standard brakes have 30% more swept area (the area covered by the brake pads) than the XLR (535 vs. 411 square inches), so the 911 has more braking power available. The 911 S’ brakes have 54% more swept area (the area covered by the brake pads) than the XLR (634 vs. 411 square inches), so the 911 S has more braking power available.

The 911 offers optional heat-treated ceramic brake rotors, which last ten to twenty times as long as conventional cast iron rotors, don’t rust, don’t fade during repeated high speed braking, and their lighter weight contribute to better braking, handling and acceleration. The XLR doesn’t offer ceramic brake rotors.

In an emergency stopping situation, many drivers don’t press the brakes with enough force to stop the vehicle in the shortest distance. The 911 has a standard brake assist system to detect emergency braking situations (by how hard and how quickly the brake pedal is pressed) and then automatically apply maximum braking immediately in order to help prevent a collision. The XLR doesn’t offer a brake assist feature.

The 911 stops much shorter than the XLR:

911

XLR

80 to 0 MPH

184 feet

222 feet

Road & Track

70 to 0 MPH

150 feet

183 feet

Car and Driver

60 to 0 MPH

113 feet

133 feet

Consumer Reports

60 to 0 MPH (Wet)

127 feet

145 feet

Consumer Reports

Tires and Wheels Comparison

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For better traction and acceleration, the 911 has larger standard rear tires than the XLR (265/40R18 vs. 235/50R18). The 911 Carrera 4 Turbo’s rear tires are larger than the largest rear tires available on the XLR (305/30R19 vs. 255/40R19).

The 911’s standard tires provide better handling because they have a lower 40 series profile (height to width ratio) which provides a stiffer sidewall than the XLR’s standard 50 series tires. The 911 S’ 235/35R19 front and 295/30R19 rear tires have a lower 35 series front and 30 series rear profile than the XLR V-Series’ 45 series front and 40 series rear tires.

Suspension and Handling Comparison

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The 911 has standard front and rear stabilizer bars, which help keep the 911 flat and controlled during cornering. The XLR base model’s suspension doesn’t offer a rear stabilizer bar.

The front and rear suspension of the 911 uses coil springs for better ride, handling and control than the XLR, which uses transverse leafs springs. Coil springs compress more progressively and offer more suspension travel for a smoother ride with less bottoming out.

The 911 Cabriolet handles at .92 G’s, while the XLR pulls only .83 G’s of cornering force in a Car and Driver skidpad test.

For better maneuverability the 911’s turning circle is 3 feet tighter than the XLR’s (36 vs. 39 feet).

Chassis Comparison

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The Porsche 911 may be more efficient, handle and accelerate better because it weighs about 250 to 550 pounds less than the Cadillac XLR.

Unibody construction makes the 911’s chassis much stiffer, which contributes to better handling, and enables softer springs to be used for a better ride. Unibody construction’s stiffness also contributes to better durability and less body squeaks and rattles. The XLR doesn’t use unibody construction, but a body-on-frame design.

The design of the Porsche 911 amounts to more than styling. The 911 offers aerodynamic coefficients of drag from .28 to .31 Cd (depending on bodystyle and options). That is lower than the XLR (.31 to .33). A more efficient exterior helps the 911 go faster and keeps the interior quieter. It also helps the 911 get better fuel mileage.

Passenger Space Comparison

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The 911 has standard seating for 4 passengers; the XLR can only carry 2.

The 911 has 14 cubic feet more passenger volume than the XLR (64 vs. 50).

Cargo Capacity Comparison

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The 911 Cabriolet has a larger trunk than the XLR with its top down (4.8 vs. 4.4 cubic feet).

Ergonomics Comparison

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If the windows are left down on the 911 the driver can raise them all using the key in the outside lock cylinder; on a hot day the driver can lower the windows. The driver of the XLR can only operate the windows from inside the vehicle, with the ignition on.

Heated windshield washer nozzles are standard on the 911 to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The XLR doesn’t offer heated windshield washer nozzles.

Consumer Reports rated the 911’s headlight performance “Very Good,” a higher rating than the XLR’s headlights, which were rated “Good.”

The 911’s standard separate stalk mounted cruise control is close at hand. The XLR’s cruise control is on an over-crowded turn signal stalk.

Economic Advantages Comparison

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Insurance will cost less for the 911 owner. The Complete Car Cost Guide estimates that insurance for the 911 will cost $385 to $560 less than the XLR over a five year period.

The 911 will cost the buyer less in the long run because of its superior resale value. Kiplinger’s estimates that the 911 will retain a greater percentage of its original price after two and four years than the XLR.

911

XLR

Four Year

51%

46%

Two Year

65% to 67%

64%

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