2015 Mercedes-Benz S-Class Coupe Road Test Specs | Edmunds

2015 Mercedes-Benz S-Class - Road Test Specs

2015 Mercedes-Benz S-Class Coupe

(4.7L V8 Twin-turbo AWD 7-speed Automatic)


Year Make Model2015 Mercedes-Benz S-Class S550 Coupe (4.7L 8cyl Turbo 7A)
Vehicle TypeRWD 2dr 4-passenger coupe
Base MSRP$120,825
Assembly locationSindelfingen, Germany


ConfigurationLongitudinal, front engine, all-wheel drive
Engine typeTwin-turbocharged, direct-injected V8, gasoline
Displacement (cc/cu-in)4,663/285
Block/head materialAluminum/aluminum
ValvetrainDouble overhead camshaft
Compression ratio (x:1)10.5
Redline, indicated (rpm)6,250
Horsepower (hp @ rpm)449 @ 5,250
Torque (lb-ft @ rpm)516 @ 1,800
Fuel typePremium unleaded (required)
Transmission typeSeven-speed automatic
Transmission ratios (x:1)I=4.38, II=2.86, III=1.92, IV=1.37, V=1.00, VI=0.82, VII=0.73
Final-drive ratio (x:1)2.65


Suspension, frontIndependent multilink, pneumatic springs, monotube dampers, stabilizer bar
Suspension, rearIndependent multilink, pneumatic springs, monotube dampers, stabilizer bar
Steering typeSpeed-proportional power steering
Steering ratio (x:1)15.6
Tire make and modelMichelin Eage F1
Tire typeAsymmetrical summer, run-flat
Tire size, front245/40R20
Tire size, rear275/35R20
Wheel size, front20 inches
Wheel size, rear20 inches
Brakes, front14.6-inch two-piece ventilated cast-iron discs
Brakes, rear14.2-inch two-piece ventilated cast-iron discs

Track Test Results

Acceleration, 0-30 mph (sec.)2.0
0-45 mph (sec.)3.3
0-60 mph (sec.)4.7
0-60 mph, mfr. claim (sec.)4.5
0-75 mph (sec.)6.8
1/4-mile (sec. @ mph)13.0 @ 109
0-60 with 1 foot of rollout (sec.)4.5
0-30 mph, trac ON (sec.)2.0
0-45 mph, trac ON (sec.)3.2
0-60 mph, trac ON (sec.)4.7
0-75 mph, trac ON (sec.)6.8
1/4-mile, trac ON (sec. @ mph)12.9 @ 108.8
0-60, trac ON with 1 foot of rollout (sec.)4.4
Braking, 30-0 mph (ft.)28
60-0 mph (ft.)113
Slalom, 6 x 100 ft. (mph)66.5
Slalom, 6 x 100 ft. (mph) ESC ON64.3
Skid pad, 200-ft. diameter (lateral g)0.89
Skid pad, 200-ft. diameter (lateral g) ESC ON0.90
Sound level @ idle (dB)39.9
@ Full throttle (dB)74.4
@ 70 mph cruise (dB)59.9
Engine speed @ 70 mph (rpm)1,800

Test Driver Ratings & Comments

Acceleration commentsWhat an engine. There is a soft spot around 2,300 rpm off the line, but then it rockets forward with unending thrust all the way down the quarter-mile. Upshifts are quick but oh-so-supple. Engine sounds forceful without being the least bit obnoxious. First run, with tranny in ?E? and ESC fully on, tied for the quickest. The S550 saw zero improvement even with power-braking (overlapping throttle and brake on the drag line, to increase revs and spool turbos), which is odd for a car with turbochargers. Trap speeds remained high, meaning there wasn't any sign of heat soak to the engine which would cause power to drop off after continued hard running. Manual shifting is via steering-wheel paddle shifters. It blips the throttle on manual downshifts (quite nicely, in fact), but does not hold gears to the rev limiter and upshifts for itself at 5,900 rpm. In fact, if you?re not turning or accelerating hard, it will eventually transfer itself back out of Manual mode and into Drive.
Braking commentsUltra-firm pedal feel, intuitive amount of travel. And this car just plain stops, with no side-to-side fuss and little nosedive. No pedal fade, near-zero brake odor. The first stop was 116 feet. The third stop was longest at 119 feet and the sixth and final stop was 117 feet.
Handling commentsSlalom: Pretty quick steering from this big coupe and good grip from the tires. There's no getting around that this is a big, heavy beast with a pretty long wheelbase, but near-67 mph isn't a bad slalom time for a car like this. It always felt solid and planted and pretty maneuverable considering its weight. One annoying aspect was that even in the transmission's "S" mode and with the paddle shifters invoked to Manual mode, the S-Class coupe would eventually revert back to Drive mode, meaning it would upshift right before we entered the slalom. Kind of annoying. Skid pad: Excellent front tire grip, despite plenty of body roll/lean as it went around the steady-state turn of the skid pad. The car was not that receptive to drop-throttle antics to alter its attitude to curtail out some understeer, and the all-wheel drive didn't allow any tail-out action whatsoever.

Testing Conditions

Test date11/11/2014
Elevation (ft.)1,121
Temperature (°F)60.5
Relative humidity (%)70.06
Barometric pressure (in. Hg)28.82
Odometer (mi.)2,346
Fuel used for test91-octane gasoline

Dimensions & Capacities

Curb weight, mfr. claim (lbs.)4,707
Curb weight, as tested (lbs.)4,737
Weight distribution, as tested, f/r (%)54.7/45.3
Length (in.)197.9
Width (in.)74.8
Height (in.)55.6
Wheelbase (in.)115.9
Track, front (in.)64
Track, rear (in.)64.9
Turning circle (ft.)38.1
Legroom, front (in.)47.1
Legroom, rear (in.)33.4
Headroom, front (in.)37.1
Headroom, rear (in.)36.9
Seating capacity4

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