2014 BMW i8 - Road Test Specs

2014 BMW i8 Coupe

(1.5L 3-cyl. Turbo Hybrid AWD 6-speed Automatic)
Vehicle
Year Make Model2014 BMW i8 2dr Coupe (gas-electric hybrid 6A)
Vehicle TypeAll-wheel-drive 2dr four-passenger sports car
Base MSRP$136,650
Options on test vehicleGiga World Package ($2,000)
As-tested MSRP$138,650
Assembly locationLeipzig, Germany
Drivetrain
ConfigurationTransverse front-mounted front-drive electric motor and transverse midengine rear-drive gasoline engine
Engine typeTurbocharged, direct-injected, inline-3, gasoline with auto stop-start
Displacement (cc/cu-in)1,498/91.4
Block/head materialAluminum/aluminum
ValvetrainDOHC, 4 valves per cylinder, variable intake + exhaust-valve timing, variable intake-valve lift
Compression ratio (x:1)9.5
Redline, indicated (rpm)6,500
Fuel cutoff/rev limiter (rpm)6,200
Horsepower (hp @ rpm)228 @ 5,800
Torque (lb-ft @ rpm)236 @ 3,700
Fuel typeElectricity and 91-octane gasoline (89-octane minimum)
Hybrid typeSeries-parallel plug-in with coordinated front-axle electric and rear-axle gasoline powertrains
Electric motor rating (kW)129 hp (96 kW)
Combined horsepower (hp @ rpm)357
Combined torque (lb-ft @ rpm)420
Battery typeLithium-ion
Battery voltage355
Battery capacity, rated (kW-hr)7.1
Battery capacity, usable (kW-hr)5.2
Plug-in type (110v/220v)SAE J1772 Level 1 (120-volt) or Level 2 (240-volt)
Charge time (hours @ 110v/220v)3.5/1.5
Plug-in driving range, mfr. claim (mi.)22 (estimated)
Transmission typeGasoline engine: six-speed automatic with console shifter and steering-mounted paddles; Electric motor: 2-speed automatic
Transmission ratios (x:1)With gasoline engine: I = 4.459, II = 2.508, III = 1.556, IV = 1.142, V = 0.851, VI = 0.672; w/electric motor: I = 11.3; II = 5.85
Final-drive ratio (x:1)3.68 (rear axle)
Chassis
Suspension, frontIndependent double wishbones with high-mount upper arm, dual-link lower arm, coil springs, driver-adjustable 2-mode dampers, lightweight hollow stabilizer bar
Suspension, rearIndependent multilink, coil springs, driver-adjustable two-mode dampers, stabilizer bar
Steering typeElectric-assist, speed-proportional, rack-and-pinion steering
Steering ratio (x:1)16.0
Tire make and modelBridgestone Potenza S001
Tire typeAsymmetrical summer high-performance, low rolling resistance
Tire size, front215/45R20 95W
Tire size, rear245/40R20 99W
Wheel size, front20-by-7.5 inches
Wheel size, rear20-by-8.5 inches
Wheel materialForged aluminum
Brakes, front13.4-by-1.1-inch ventilated and cross-drilled cast-iron discs with four-piston fixed calipers
Brakes, rear13-by-0.8-inch ventilated and cross-drilled cast-iron discs with single-piston sliding calipers
Track Test Results
Acceleration, 0-30 mph (sec.)2.0
0-45 mph (sec.)3.1
0-60 mph (sec.)4.5
0-75 mph (sec.)6.3
1/4-mile (sec. @ mph)12.6 @ 111.8
0-60 with 1 foot of rollout (sec.)4.2
0-30 mph, trac ON (sec.)2.3
0-45 mph, trac ON (sec.)3.5
0-60 mph, trac ON (sec.)4.9
0-75 mph, trac ON (sec.)6.6
1/4-mile, trac ON (sec. @ mph)12.9 @ 112.6
0-60, trac ON with 1 foot of rollout (sec.)4.6
Braking, 30-0 mph (ft.)27
60-0 mph (ft.)108
Slalom, 6 x 100 ft. (mph)66.5
Slalom, 6 x 100 ft. (mph) ESC ON67.0
Skid pad, 200-ft. diameter (lateral g)0.93
Skid pad, 200-ft. diameter (lateral g) ESC ON0.91
Sound level @ idle (dB)38.3
@ Full throttle (dB)86.0
@ 70 mph cruise (dB)66.8
Engine speed @ 70 mph (rpm)2,000
Test Driver Ratings & Comments
Acceleration commentsAcceleration in any mode (Sport, Comfort, EV) is essentially the same when the throttle is pinned to the floor as we do at the test track. I believe the slight variations we observed (esp. in EV mode) came from the car's powertrain realizing, "Oh, you want to go really fast? In that case, I'll also run the gasoline engine..." Very smooth power delivery and quick upshifts in each mode. There's no sense whatsoever of dual power sources or blending in any way. It just goes and shifts like a typical car. Interesting, sporty soundtrack with a frisky sound like a six-cylinder engine.
Braking commentsMinimal nosedive and excellent directional stability, with a firm pedal from first stop to last. Consistent stopping distances and no measurable brake fade.
Handling commentsThe rear wheels must be much farther apart than the fronts because I kept kicking slalom cones just out of their boxes without knowing I had done that. Once I made the adjustment, I found the front of the car lost grip before the rear at the limit -- a safe way to remind the driver that the limit has been reached. There was more body lean and less tire grip than I had hoped (or imagined) from this racy-looking car. Electronic stability control (ESC) is quite lenient, first cutting power, then subtly redirecting the car with individual brakes, but most drivers would likely never know that had happened. The steering is best described as friction-free, but not what an enthusiast would call "talkative" in terms of feeling the road. Steering response is good, ratio is good, precision is excellent. I wasn't able to discern a difference between "Sport" mode and Comfort in terms of actual capability or even feel. The only difference was that Comfort didn't want to stay in a manually selected gear from the beginning of a run to the end and would self-default to Drive.
Testing Conditions
Test date7/29/2014
Elevation (ft.)1,121
Temperature (F)86
Relative humidity (%)20
Barometric pressure (in. Hg)28.80
Wind (mph, direction)1.7. head- and crosswind
Odometer (mi.)3117
Fuel used for testElectricity and 91-octane gasoline
As-tested tire pressures, f/r (psi)30/33
Fuel Consumption
Fuel tank capacity (U.S. gal.)11.1
Dimensions & Capacities
Curb weight, mfr. claim (lbs.)3,455 (U.S.-spec car)
Curb weight, as tested (lbs.)3,382 (Euro-spec car)
Weight distribution, as tested, f/r (%)49/51
Length (in.)184.9
Width (in.)76.5
Height (in.)50.8
Wheelbase (in.)110.2
Track, front (in.)64.7
Track, rear (in.)67.8
Turning circle (ft.)40.4
Legroom, front (in.)43.1
Legroom, rear (in.)28.2
Headroom, front (in.)38.7
Headroom, rear (in.)32.4
Shoulder room, front (in.)56.7
Shoulder room, rear (in.)49.6
Seating capacity4
Step-in height, measured (in.)19.9
Trunk volume (cu-ft)4.7
Cargo loading height, measured (in.)37.0
GVWR (lbs.)4,090
Payload, mfr. max claim (lbs.)620
Ground clearance (in.)4.6

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