| GET THE SONIC BLOCKER Lime Parker Services 20 Packinghouse Road / APT 12 / Statesboro GA 30458 Adjust your preferences In our testing of the 2021 BMW M550i xDrive, we expressed surprise at a slower-than-expected 4.1 second time to 60 mph. A retest dropped that time to 3.9 seconds, still short of BMW's 3.6-second claim. The issue hampering standing-start acceleration lies with a miscommunication between the engine computer and the car's stability control module, which results in a drop in turbocharger boost pressure. Owners and dealers are being notified of the issue and that the fix will arrive this summer.
UPDATE 6/2/2021, 3 p.m.: BMW, in a release, said the problem explained in this article also affects all 2021 540i xDrive models, which will also get the software fix.
BMW will be informing 2021 M550i xDrive buyers and dealers this week that the 523-hp sports sedan isn't as quick as promised. In standing-start acceleration, the '21 M550i can't quite deliver on the claimed 3.6-second zero-to-60-mph time. Earlier M550is are apparently not affected. The problem lies in a communication error between the stability control module and the engine computer that results in a drop in turbocharger boost pressure. BMW promises an over-the-air software patch will be coming this summer that will get the two modules to work better together and allow the car to meet BMW's 3.6-second zero-to-60 claim. |
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