2011 BMW Z4 - Road Test Specs

2011 BMW Z4 Convertible

(3.0L 6-cyl. Twin-turbo 7-speed Automated Manual)
Vehicle
Year Make Model2011 BMW Z4 sDrive35is 2dr Convertible (3.0L 6cyl Turbo 7AM)
Vehicle TypeRWD 2dr 2-passenger Convertible
Base MSRP$61,925
Options on test vehicleMelbourne Red Metallic ($550); Comfort Access Keyless Entry ($500); Heated Front Seats ($500); iPod and USB Adapter ($400); Satellite Radio ($350).
As-tested MSRP$64,225
Assembly locationRegensburg, Germany
North American parts content (%)5
Drivetrain
ConfigurationLongitudinal, front-engine, rear-wheel drive
Engine typeTwin-turbocharged, direct-injected, inline-6, gasoline
Displacement (cc/cu-in)2,979cc (182cu-in)
Block/head materialAluminum/Aluminum
ValvetrainDOHC, 4 valves/cylinder variable intake + exhaust-valve timing
Compression ratio (x:1)10.2
Redline, indicated (rpm)7,000
Horsepower (hp @ rpm)335 @ 5,900
Torque (lb-ft @ rpm)332 @ 1,500
Fuel typePremium unleaded (required)
Transmission type7-speed auto-double-clutch manual with console shifter and steering-mounted paddles with sport/competition modes
Transmission ratios (x:1)I: 4.78, II: 3.056, III: 2.153, IV: 1.678, V: 1.39, VI: 1.203, VII: 1
Final-drive ratio (x:1)2.56
Chassis
Suspension, frontIndependent MacPherson struts, coil springs, stabilizer bar
Suspension, rearIndependent multilink, coil springs, stabilizer bar
Steering typeElectric speed-proportional power steering
Steering ratio (x:1)14.4
Tire make and modelBridgestone Potenza RE050A
Tire typeAsymmetrical summer, performance, run-flat (36 psi cold front; 44 psi cold rear)
Tire size, frontP225/35R19 88Y
Tire size, rearP255/30R19 91Y
Wheel size, front19-by-8.0
Wheel size, rear19-by-8.5
Wheel materialAluminum
Brakes, front13.7-in ventilated cast-iron discs with 1-piston sliding calipers
Brakes, rear12.8-in ventilated cast-iron discs with 1-piston sliding calipers
Track Test Results
0-30 mph, trac ON (sec.)2.3
0-45 mph, trac ON (sec.)3.4
0-60 mph, trac ON (sec.)5.0
0-75 mph, trac ON (sec.)7.0
1/4-mile, trac ON (sec. @ mph)13.1 @ 107.5
0-60, trac ON with 1 foot of rollout (sec.)4.5
Braking, 30-0 mph (ft.)27
60-0 mph (ft.)105
Slalom, 6 x 100 ft. (mph)66.7
Slalom, 6 x 100 ft. (mph) ESC ON65.8
Skid pad, 200-ft. diameter (lateral g)0.89
Skid pad, 200-ft. diameter (lateral g) ESC ON0.90
Sound level @ idle (dB)48.4
@ Full throttle (dB)80.5
@ 70 mph cruise (dB)70.1
Engine speed @ 70 mph (rpm)2,300
Test Driver Ratings & Comments
Acceleration commentsAfter every possible combo of DSC on/off, normal, Sport and Sport +, manual, D or DS, the quickest run was Sport + and DS with traction on. Launch mode produced too much wheelspin and was actually slower. If I "pedaled" it, it would short shift, reduce engine output, or both. There's so much electronic wizardry going on it's impossible to know what works best or even what to expect from run to run. Lightning shifts!
Braking commentsSolid, trustworthy pedal, zero ABS flutter/noise, negligible fade. Very good brakes.
Handling commentsMild understeer with ESC off, steering doesn't say much about grip level or skid-slide of front tires. With Sport + mode, ever-so-slight brake intervention (if at all) with essentially identical results. So many issues in the slalom. Where to begin? Manual mode on transmission actually downshifted as I whacked the throttle on exit. Lame. Steering (in Sport/Sport +) is heavy for heavy sake and no feel. Also in Sport/Sport +, it's very flighty, nervous and hates dip at cone #3. Best turn in normal with ESC off, but even then there wasn't enough grip to go with the quick responses. There's so much "static" in the suspension that it's very hard to ever feel connected to this car.
Testing Conditions
Test date8/17/2010
Test locationCalifornia Speedway
Elevation (ft.)1,121
Temperature (F)84.4
Relative humidity (%)35.9
Barometric pressure (in. Hg)28.8
Wind (mph, direction)1.7
Odometer (mi.)2,698
Fuel used for test91-octane gasoline
As-tested tire pressures, f/r (psi)36/44
Fuel Consumption
EPA fuel economy (mpg)17 city/24 highway/19 combined
Edmunds observed (mpg)22.9
Fuel tank capacity (U.S. gal.)14.5
Driving range (mi.)348
Audio and Advanced Technology
iPod/digital media compatibilityOptional iPod via USB jack
Satellite radioOptional Sirius
Smart entry/StartOptional ignition doors
Dimensions & Capacities
Curb weight, mfr. claim (lbs.)3,549
Curb weight, as tested (lbs.)3,488
Weight distribution, as tested, f/r (%)49/51
Length (in.)167.0
Width (in.)70.5
Height (in.)50.6
Wheelbase (in.)98.3
Track, front (in.)59.5
Track, rear (in.)60.5
Turning circle (ft.)35.1
Legroom, front (in.)42.2
Headroom, front (in.)39.1
Shoulder room, front (in.)53.3
Seating capacity2
Step-in height, measured (in.)15.3
Cargo loading height, measured (in.)27.8
GVWR (lbs.)4,178
Tow capacity, mfr. claim (lbs.)Not published
Convertible top materialGlass rear window with defroster
Operation typePower-operated top and latches, includes global window operation with integral tonneau cover
Operation lockoutRequires stationary vehicle
Warranty
Bumper-to-bumper4 years/50,000 miles
Powertrain4 years/50,000 miles
Corrosion12 years/Unlimited miles
Roadside assistance4 years/Unlimited miles
Free scheduled maintenance4 years/50,000 miles

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