Bugatti has put its 1,800 HP Tourbillon hybrid hypercar through four weeks of cold-weather validation at the Colmis Proving Ground in Arjeplog, Sweden, with temperatures dipping to minus 30 degrees Celsius. The program, documented in the latest episode of the marque’s A New Era docuseries, tested the prototype’s HVAC, ABS, ESC, traction control, and brake-by-wire systems across polished ice, packed snow, slush, and asphalt. Chief Development Driver Miroslav Zrnčević led a 20-person team validating the all-new platform’s behavior at the boundaries of low-grip handling. The Tourbillon pairs a naturally aspirated V16 with three electric motors and routes power through an all-wheel-drive system with front-axle torque vectoring.
Highlights
- Four-week winter program at Arjeplog’s Colmis Proving Ground covered HVAC, ABS, ESC, traction control, and brake-by-wire calibration
- Temperatures reached minus 30 degrees Celsius in the first phase, with night sessions added as warmer weather narrowed the testing window
- The 1,800 HP hybrid powertrain combines a naturally aspirated V16, three electric motors, and an eight-speed dual-clutch transmission
- Twenty-person team supported the program, with a six-person core working two shifts across weekends through the full campaign
Platform and Powertrain Architecture
The Tourbillon is built on an all-new platform with a naturally aspirated V16 engine, three electric motors, and a hybrid powertrain rated at 1,800 HP combined. Two electric motors sit at the front axle, enabling all-wheel-drive control and torque vectoring. The V16 drives the rear axle alongside a third electric motor, with power delivered through an eight-speed dual-clutch transmission.
The architecture is a departure from Bugatti’s previous quad-turbocharged W16 layout used in the Chiron and Veyron platforms. Where those cars relied on forced induction for headline output, the Tourbillon uses electrification to extend the operating envelope of a naturally aspirated engine — a configuration that places it closer in philosophy to the Mercedes-AMG ONE and Aston Martin Valkyrie than to the Rimac Nevera or other battery-electric hypercars.
Cold-Weather Test Program
The Sweden program centered on what Bugatti calls low-MU conditions, where the coefficient of grip is dramatically reduced. Engineers evaluated how the car behaves across constantly changing surfaces — polished ice, packed snow, slush, and asphalt — and through MU-jumps, where a vehicle transitions from one grip level to another mid-event.
“We are here to test and develop the Tourbillon in extreme conditions, to do various different tests on the HVAC system, on ABS, on ESC systems, traction control and vehicle dynamics in general,” said Zrnčević, Chief Development Driver at Bugatti Rimac.
The program ran for four weeks, with the team adapting continuously as conditions shifted. Initial sessions saw temperatures of minus 30 degrees Celsius before warmer weather altered surface characteristics. Night sessions extended the working window as true winter conditions narrowed.
“Of course, hypercars are not really intended to be driven on snow and ice, but we do cover this quite extensively. Simply because it’s of paramount importance, to both our customers and the teams developing the car, that the Tourbillon works extremely well in all weather conditions,” Zrnčević said. “After all, if its capabilities are comparable to other cars, it’s no longer a Bugatti.”
Brake-by-Wire and Regenerative Integration
The braking system received particular attention. The Tourbillon uses a brake-by-wire architecture that blends regenerative braking from the electric motors with hydraulic foundation brakes. Test drivers worked to ensure the relationship between the two systems felt natural to the driver while remaining precise across the full range of test surfaces.
ABS and ESC calibration formed the next layer of analysis. Engineers evaluated the systems’ response to MU-jumps — for instance, when a prototype begins braking on dry or heated asphalt before crossing onto polished ice, requiring the control systems to recognize and adjust to the sudden grip change in real time.
Drive Modes and Dynamic Calibration
The Tourbillon offers three drive modes that progressively open the dynamic envelope. Comfort mode prioritizes stability, with the safety systems intervening early to keep the car composed in low-grip conditions. Sport mode shifts the balance toward neutrality and allows more engine character through. Track mode pushes torque further rearward and permits greater side slip while keeping the all-wheel-drive system, traction control, and ESC active.
“We have different driving modes on the car and, of course, depending on what the customer wants, the car can be driven in a completely different way,” Zrnčević said. “So we are changing the balance of the car, the vehicle dynamics, but also the safety systems, opening or closing the envelope of the safety systems.”
Team and Program Scope
Twenty people supported the Sweden program, with a six-person core team rotating through two shifts across weekends and through the full four-week campaign. Bugatti had completed an earlier winter session the previous year, but the current program represented the bulk of cold-weather development for the platform.
The full episode, “A New Era: Extreme Conditions,” is available on the official Bugatti YouTube channel.
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