Ford Mustang Mach-E owners are shocked by the low trap speed at the drag strip

The Ford Mustang Mach-E was controversial at launch for borrowing a famous performance nameplate for an electric SUV. Overall, everyone got sick of that argument, and now there’s a new debate going on. It’s all about the Mustang Mach-E GT’s performance in the quarter-mile, or more specifically, its curiously low trap speed. The debate has since spread across the pages of Reddit, posted on from a man named Tommy.

The latest Husky comes from a base Mustang Mach-E GT with a timeslip. Running in a 72% charge condition and rated at 480 horsepower, the vehicle clocked 12.685 quarter-miles while only hitting 100 mph. The owner also noted a significant reduction in perceived acceleration beyond the 80mph mark. Notably, the timing is only a hair slower than what was achieved by owning the GT Performance Edition, which we covered in August—the upgraded model achieved 12.657 second quarter-mile while again only 100 mph. distance covered.

What has intrigued the community as a whole is that the trap speed recorded is 5–10 mph slower than would be expected for a mid-12 quarter-mile. Further complicating the issue, testing by car and driver The lower-end Mustang was the Mach-E premium AWD model, with just 346 hp, delivering a top 13.8-second quarter-mile at a top speed of 101 mph. This has left the owners scratching their heads as to the real issue in the game.

A major point mentioned by many is the fundamental way in which electric motors work. As electric motors turn, they create a “back-emf” voltage across their coils, which increases with rotational speed. The faster the motor spins, the more the back-emf goes up, until it equals the driving voltage applied to the motor. Electric motors can deliver full torque from zero rpm to this limit.

Beyond this point, if the motor is to turn any faster, the driving hardware will have to be creative. We can’t easily go over the peak voltage of the battery, so instead the back-emf needs to be reduced. This is done by a method called “field weakening” or “flow weakening”, where currents are applied to the coils in the motor to oppose the magnetic field of the motor’s own magnet. This reduces the total magnetic field, thus reducing the back-emf, and allowing the motor to start up faster. However, in this mode of operation, while the power remains constant, the torque drops quickly due to the weak magnetic field.

Thus, for a single-speed electric vehicle using permanent-magnet motors with field weakening, acceleration is expected to decline as power becomes available as aerodynamic drag increases. The problem with the Mustang Mach-E GT model, however, is that it looks like this drop-off is happening sooner than others would appreciate. Comparisons with Tesla Model Y performance, whether fair or not, have been made regularly. With slightly less power but less weight, the Tesla rival clocks 11.91 second quarter mile with a net speed of 116 mph as reported self development.

This has disappointed some Mach-E owners, questioning why their more powerful vehicle isn’t any closer to the Tesla in a quarter mile, despite the same 0-60 times in the 3-second range. However, a look at their relative top speeds might shed some light on the matter: The Mach-E GT tops out at 130 mph, while the Model Y performance quotes that comparison to 155 mph.

It suggests that Ford has tuned the Mach-E GT model 0-60 times for a great off-the-line debut, making trade-offs in top-end performance. It’s also worth noting that times posted on forums have often been recorded by owners in unbridled Extend Drive mode, aimed at consistently performing lap-to-lap-to-track performances on the track, rather than giving everything up for one big pass of the drag strip. Keep the lap.

Thus, there may still be some speed at hand for Mach-E. It could be that in its current form, the Mach-E puts some power back from the battery or motor controllers on the top-end, which may be unlocked in a future software update. Similarly, Ford may leave out “drag mode” optimized for quarter-mile performance. It could also be a simple fact that there aren’t a handful of TimeSlip reps posted online so far, and a Mach-E 11.9 second quarter-mile on the perfect day, a fully charged battery, and ready to drop on the right. Is. Drive Settings.

The fact that the lower-end premium AWD models are able to trap higher speeds than the Mach-E GT indicates that there may be more performance left on the table. Drive Ford has been contacted regarding this debate and will update in due course.

Regardless, it’s likely that the vast majority of Mach-Es will never see a drag strip and owners will be perfectly pleased with their purchase. However, for those willing to put rubber on the strip in their GT models, clearly a little more hustle would be more than welcome. Whether Ford can make it to the table remains to be seen.

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