Quite a discrepancy it is

When BMW announced the 2019 M5 Competition, it also announced that the M5 was finally faster than the Mercedes-AMG E63 S. With a 4.4-liter V-8, the 2019 M5 Competition has an “official” output of 617 horsepower and 553 pound-feet of torque at the crank. For those of you that don’t know, that figure is actually different from the power that makes it to the wheels because there isn’t a driveline out there that doesn’t have at least some loss from crank to the wheels. Most modern lock-up torque converters, for example, lose 10-percent just because of the nature of hydraulic coupling and natural slip. Even without a torque converter, horsepower and torque can be lost through the rest of the driveline as well – remember the engine’s crank spins on one axis while the tires spin on the other.

But, I digress.

The point is that BMW is known for historically understating power output but the question of how much has been a topic for debate. Now, it turns out that the 2019 BMW M5 Competition has been put to the test and it fares much better than BMW lets on. How much better? Well, keep reading to find out.

The BMW M5 Competition Has 617 Horsepower, But Not Where BMW Says

The 2019 BMW M5 Competition Is More Powerful Than BMW Says, But How Powerful is it, Really? Exterior
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Car & Driver decided to put the 2019 BMW M5 on the dyno to see just how much power it really puts down. 617 horsepower and 553 pound-feet of torque at the crankshaft isn’t anything to snub your nose at, but what if I told you that the 2019 M5 Competition actually delivers more like 700 horsepower at the crank? It’s not exactly 700 horsepower, of course, but it’s likely close. Let me explain.

When Car and Driver put the 2019 BMW M5 Competition on the Dyno, it did it right. The car was ran in sixth gear which offers, essentially, and 1:1 gear ratio.

Testing showed that the M5’s impressive torque figure kicks in at around 2,100 rpm and held flat at around 606 pound-feet all the way until around 5,000 when it slowly starts to dip off.

Horsepower built through the entire range until it peaked at 617, before taking a nosedive at 6,000 rpm. For the record, 6,000 rpm – in sixth gear – is where the M5 hits that 162-mph speed limiter, so that fall off is natural. The engine may have pushed a little more horsepower, as the engine can rev to 7,200 rpm, but it wouldn’t have been much as it was starting to drop at that point as well.

The 2019 BMW M5 Competition Is More Powerful Than BMW Says, But How Powerful is it, Really? Exterior
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With all of that said, the test came up with a total output of 617 horsepower and 606 pound-feet of torque. That’s the proper horsepower figure and just over 50 pound-feet more, right? Well, yes, but these figures represent power output at the wheels, not the crank, which means they come after the natural loss of power as it’s transmitted through the driveline.

That means that, at the crank, the M5 Competition actually puts out closer to 675 or 700 horsepower and probably around 650 pound-feet at the crank.

That’s just downright crazy given the official rating of 617 horsepower and 553 pound-feet at the crank.

In the end, it’s not really all that surprising as BMW – and a lot of other automakers, for that matter – are known to underestimate figures. However, it makes a little more sense as to why C&D was able to get the M5 Competition to wax the quarter mile in 11 seconds flat – damn near as fast as the 2017 Ford GT that pumps out 647 horsepower and weighs nearly 700 pounds less.

The 2019 BMW M5 Competition Is More Powerful Than BMW Says, But How Powerful is it, Really? Exterior
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BMW M5 Competition Package Drivetrain Specifications
Engine type 4.4-liter V-8 engine
Cylinders 8
Valves per cylinder 4
Stroke 88.3
Bore 89
Displacement 4,395
Compression rate
Engine power 617 HP @ 6,000 RPM
Engine torque 553 LB-FT @ 1,800-5,860 RPM
0-60 mph 3.1 seconds
Top speed 155 mph
Top speed with M Drivers Package 189 mph

Further reading

The 2019 BMW M5 Competition Is More Powerful Than BMW Says, But How Powerful is it, Really? Wallpaper quality Exterior
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Read our full review on the 2019 BMW M5 Competition.

2018 BMW M5 High Resolution Exterior
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Read our full review on the 2018 BMW M5.

2018 BMW M5 with M Performance Parts
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2018 BMW M5 with M Performance Parts

Read our full review on the 2018 BMW M5 with M Performance Parts.

2014 BMW M5 Competition Package High Resolution Exterior
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Read our full review on the 2014 BMW M5 Competition Package.

Source: Car & Driver

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