Volvo has the 421-hp XC90 T8 by Polestar as their most powerful vehicle ever image

The Swedes have decided to only have four-cylinder engines throughout their entire range – but that doesn’t mean Polestar can’t have some fun with the powertrains.

Now the most powerful Volvo ever is the second generation flagship SUV XC90 – which has a new configuration for its range-topping T8 Twin Engine. It was mere days ago when Polestar decided to update the D5 diesel engine of the newly introduced S90 and V90 models. But that was a mere teaser for the XC90’s crossover. In the regular XC90 the T8 Twin Engine is capable of a cool 400 horsepower (298 kilowatts) and 472 pound-feet (640 Newton meters) of torque. This is achieved using a turbocharged and supercharged 2.0-liter, four-cylinder engine that is assisted by an electric motor and battery pack.

Volvo XC90 T8 Twin Engine with Polestar Performance Optimisation

Polestar has massaged the components to a combined 421 hp (314 kW) and 502 lb-ft (680 Nm). The internal combustion engine alone delivers 334 hp (249 kW) and 324 lb-ft (440 Nm), aided by the electric motor sporting 87 hp (65 kW) and 177 lb-ft (240 Nm). Thanks to the update, the XC90 T8 by Polestar will do the 62 mph sprint in just 5.5 seconds – with unmodified fuel economy ratings of 2.1 liters / 100 km combined and a 43-km electric range.

The in-house tuner also reworked the throttle response and reworked the gear hold function which is able to retain the selected gear during cornering at high lateral g-forces. Polestar’s mod for the XC90 will become available in Europe before crossing the pond over to the United States this fall, in October.