It already had plenty of both, but more is better, right?

When driving the latest BMW M550d xDrive you don’t really feel that what it needs is extra power and torque, but that has never stopped tuners from turning things up to eleven. German tuner mcchip-dkr has unlocked more of everything from the quad-turbo 3.0-liter straight-six, and it now offers two stages of power.

Tuner squeezes extra power and torque from BMW M550d xDrive Exterior
- image 800522

In stock form, the M550d makes 396 horsepower and 560 pound-feet of torque, which is good for a sprint time from naught to 62 mph / 100 km/h in 4.4 seconds.

The first stage (which costs €1,399 / $1,600) bumps power to 464 horsepower and torque up to 627 pound-feet, and with it installed, top speed is also increased from the factory-limited 155 mph (250 km/h) to 180 mph (290 km/h).

Then there’s the (€1,670 / $1,930) stage two kit which further increases power to 508 horsepower and torque to 638 pound-feet and if the first kit doesn’t drop its sprint time to 62 mph / 100 km/h under the four seconds mark, then this second one surely will. Top speed also gets an extra nudge, to 183 mph (295 km/h).

Tuner squeezes extra power and torque from BMW M550d xDrive Exterior
- image 800515

In the standard car, full torque is not available in the first gears, so mcchip-dkr could have tweaked this with their revised software - BMW probably did that to protect the transmission and all-wheel drive components from excessive wear, but it would be interesting to see what an M550d xDrive does when it unleashes all available torque from standstill - it has no reason not to light up all four wheels and power away in a plume of tire smoke with all electronic aids disabled.

The car in the photos also features additional modifications on top of the remap job.

It rides on an aftermarket KW coilover setup and a set of 20-inch mbDESIGN wheels with 255-section tires up front and 285-section tires on the rear; oh and it also has decals on the body similar to what you’d see on an early 1990s car.

Further reading

2018 BMW M550d xDrive
- image 716524

Read our full review on the 2018 BMW M550d xDrive.

2018 BMW M550d xDrive - Driven
- image 798983

Read our full driven review on the 2018 BMW M550d xDrive.

What do you think?
Show Comments
Car Finder: