Xiaomi SU7 Ultra – hot EV is world’s fastest 4-door with 1,548 PS, 0-100 km/h 1.98 secs, 350 km/h top

It’s been three months since Xiaomi wowed the automotive world with the SU7 Ultra Prototype, and it’s now followed that up with the production version of its electric track-only monster. Still borrowing its moniker from the firm’s flagship phones, the road-going Xiaomi SU7 Ultra is claimed to be the world’s fastest four-door sedan, wresting the title away from the Porsche Taycan Turbo GT and Tesla Model S Plaid.

The specs certainly make for some eye-watering reading, being that it shares its incredible powertrain with the prototype. This consists of two of Xiaomi’s V8s motors at the rear – each making 578 PS (425 kW) and 635 Nm of torque all on its own, making them the most powerful drive motor – and the 392 PS (288 kW) V6s motor from the regular SU7 Max out front.

In total, the triple-motor setup churns out 1,548 PS (1,139 kW), enabling the Ultra to sprint from zero to 100 km/h in just 1.98 seconds with one foot of rollout subtracted. This compares favourably with the Model S Plaid (2.1 seconds) and the Taycan Turbo GT (2.3 seconds), although the latter figure includes the said rollout and is therefore a more representative number.

Clearly not satisfied, the Ultra then takes nearly a second out the Porsche on its way to 200 km/h, which it hits in a scarcely-believable 5.86 seconds. Even more impressive is the top speed, which is well beyond its rivals at a staggering Ferrari F80-baiting 350 km/h. The car also features a track-optimised cooling system that enables two consecutive laps of the Nürburgring Nordschleife without overheating.

Ensuring those power-hungry motors receive all the electricity they need is a 93.7 kWh CATL Qilin 2.0 nickel manganese cobalt (NMC) battery, which is able to discharge a whopping 1,808 PS (1,330 kW), and even with just 20% charge remaining it can still produce 1,088 PS (800 kW). The 897-volt pack supports 5.2C (or 5.2 times the capacity) charging, so expect DC fast charging speeds of around 490 kW, topping the battery up from 10 to 80% in just 11 minutes. No range figures have been released as yet.

To make sure the Ultra isn’t just a straight-line monster, Xiaomi has fitted the car with two Nürburgring-tuned chassis options – dual-chamber air suspension or manually-adjustable Bilstein Evo T1 coilovers. The two rear motors are also capable of real torque vectoring, while Akebono carbon ceramic brakes (featuring the largest discs in its class, at 430 mm at the front) haul the car from 100 km/h in just 30.8 metres; they are also claimed to be able to handle ten consecutive stops from 180 km/h without fading.

Also fitted is a menacing aerodynamic package that consists of a larger splitter, U-shaped air blades and a 10% larger cooling aperture at the front, along with a fixed carbon fibre rear wing. But the highlight is undoubtedly the active rear diffuser, which can stall the airflow to reduce drag and increase efficiency in everyday driving. All-in-all, the Ultra produces 285 kg of downforce at its 380 km/h V-max.

The body has also been made seven millimetres wider, and that’s to fit the 21-inch alloy wheels wrapped in Pirelli P Zero Elect tyres. Carbon fibre door mirrors, roof and side skirts, plus a Porsche-esque Ultra graphics package, complete the look.

Inside, the Ultra is differentiated through heavily-bolstered carbon fibre-backed active sports seats, a carbon-trimmed steering wheel with a flat top and bottom (and a red Boost button) and masses of yellow leather and black Alcantara.

The SU7’s 7.1-inch slimline digital instrument display and 16.1-inch infotainment touchscreen feature revised graphics to fit the Ultra’s sporty nature. There’s also a Track Master app that features 20 built-in track maps and lap time rankings in China; it displays real-time vehicle and performance information, provides telemetry visualisation and analysis and allows users to share videos of their hot laps.

The price for all this extravagance? A reasonable 814,900 yuan (RM500,600) – less than half the price of the Taycan Turbo GT. Unfortunately, there’s no word on exports for the Ultra (or indeed any SU7, despite the car being shown here earlier this month), nor any plans for a right-hand-drive conversion. Would you buy the SU7 Ultra if it ever comes to Malaysia? Sound off in the comments after the jump.

Looking to sell your car? Sell it with Carro.