InsideLine Video: 2011 Infiniti M56 vs. 2011 BMW 550i Comparison Test

5-series | December 28th, 2010 by 20
2011 infiniti m56 f34 fe 1115101 1600 750x500

InsideLine puts out a comprehensive comparison between BMW’s latest generation 5 Series and its counterpart in the Infiniti line-up, the M56. The top of the …

InsideLine puts out a comprehensive comparison between BMW’s latest generation 5 Series and its counterpart in the Infiniti line-up, the M56.

The top of the line 550i receives a mixed review from InsideLine with some of the negative points we have heard lately, or even experienced ourselves behind the wheel of the new 5: steering feels artificial and a bit overweight (4,400 lbs).

But it’s the 550i an overall better car?

Let’s see an excerpt from their review:

How They Stack Up
Not surprisingly, the 2011 BMW 550i and 2011 Infiniti M56 have plenty of similarities. Both are rear-drive sedans powered by sizable V8s. In this case, both are hooked to automatic transmissions, a seven-speed in the Infiniti and an eight-speed in the BMW.

2011 bmw 5 series group fe 1115103 1600 655x436…..

What’s the Motivation Here?
Turbocharged engines are quickly becoming the norm at BMW, and now the 550i is on board. Its direct-injected 4.4-liter twin-turbo V8 produces 400 horsepower at 5,500 rpm and 450 pound-feet of torque from 1,750-4,500 rpm. Yes, that’s a massive torque curve, but it comes at the expense of the old V8’s rumbling exhaust. Now there’s little more than a muted growl, and you can’t even hear the turbos working their magic.

2011 bmw 5 series f34 fe 1115101 1600 655x436

The 2011 Infiniti M56 uses cubic inches and plenty of revs to achieve its power. Its 5.6-liter V8 is good for 420 hp at 6,000 rpm and 417 lb-ft of torque at 4,400. It’s no dinosaur, also utilizing direct-injection and variable valve timing and valve lift for a smooth, reasonably efficient power plant.

A little more driver involvement is required to get the most out of the M56’s V8, though, as its power is concentrated at higher engine speeds. The Infiniti sounds more like a sport sedan than the BMW, especially when it approaches the 6,700-rpm redline.

2011_infiniti_m56_f34_fe_1115101_1600

By the Numbers
At our test track, the M56 was slightly quicker to 60 mph than the 550i, 5.0 to 5.2 seconds, respectively (4.7 and 4.9 seconds with a 1-foot rollout, as on a drag strip). So the BMW is slower, despite the fact that it’s capable of getting a near-perfect amount of wheelspin off the line thanks to power-braking, something the Infiniti’s brake-override system won’t allow.

So how come the BMW is slower? Might have something to do with the extra 287 pounds of ballast the 4,380-pound 550i carries versus the M56. Seriously, what’s a 5 Series doing weighing nearly 4,400 pounds? This is “EfficientDynamics?”

Weight aside, by the time the 550i hits the quarter-mile, its twin-turbo V8 inches the BMW ahead by 0.1 second (13.2 vs. 13.3); it’s also traveling a lot faster at this point — 108.3 mph against the Infiniti’s 106.7.

Full review at Insideline.

BMWBLOG

NEWSLETTER