Koenigsegg Jesko

Engine

The engine is a development of the undefined cc twin-turbocharged V8 engine used in the Agera. It has four valves per cylinder each with a bore and stroke of 92 x and a compression ratio of 8.6:1. The engine has a power output of 1280 hp at 7,800 rpm and 1000 Nm of torque at 2,700 to 6,170 rpm on normal petrol and has a power output of 1600 hp and 1500 Nm of torque at 5,100 rpm on E85 biofuel.[9][10]

Changes from the Agera's engine include the use of a new 180-degree flat-plane crankshaft that saves 5 kg and increases the redline from 8,250 rpm to 8,500 rpm. The Jesko also utilises active rubber mounts from the Regera that reduce engine vibrations in the cabin. The two large turbochargers are equipped with a 20-litre air tank made from carbon fibre, coupled with an electric compressor which feeds pressurised air to the turbochargers at a pressure of 20 bar in order to reduce turbo lag. The engine has pressure sensors for each cylinder in order to achieve real time cylinder monitoring for the multipoint fuel injection system.[7][11]

Transmission

The engine is mated to an in-house developed 9-speed multi-clutch transmission called the "Light Speed Transmission (LST)"[1] by the manufacturer. The new transmission has a weight of 90 kg and it is at least 50% shorter in length than the previous 7-speed dual-clutch unit. It has 9 forward gear combinations using a layout with an input shaft with 3 fixed gears which is mated to a secondary shaft with 3 gears fixed to the output shaft and 3 clutched gears mated to the input shaft and an output shaft with 4 clutched gears (one set is used for reverse which mates directly to the input shaft), allowing the transmission to change gears without an interruption in power delivery due to the speedy nature of clutch actuation and overlap between the clutches opening and closing. The engine's crankshaft is mated directly to the LST and uses the rotating mass of the transmission components in place of a traditional flywheel.[12] The transmission has a shift time ranging from 20 to 30 milliseconds. It also has an overdrive mode called "Ultimate Power on Demand" that is designed to skip directly to the optimal gear depending on user input, rather than down or upshifting sequentially to that gear.[7][13]

The transmission is controlled by an onboard computer which uses engine and road speed data to engage a gear. Gears are selected by the driver either using the shift paddles mounted on the steering column or the gear selector.[14]

Chassis and suspension

Unlike its predecessors, the high-downforce Attack variant of the Jesko has Koenigsegg's 'Triplex' dampers at the front and the rear combined with traditional Öhlins dampers. A horizontal rear damper prevents the rear from pressing on the ground during hard acceleration. The front dampers stabilise the car at high speeds while active rear wheel steering ensures further stability at all performance levels.

The carbon body tub used in the Jesko is 40 mm longer and 22 mm wider from that of its predecessor in order to allow for more passenger room. The tub has been redesigned and incorporates an aluminium monocoque structure for increased rigidity.[16]

Wheels, brakes and tyres

The car comes standard with forged aluminium centre lock wheels, with diameters of 20 inches at the front and 21 inches at the rear.[1] Lighter carbon fibre wheels are available as an option, weighing 5.9 kg at the front and 7.7 kg at the rear. The tyres are Michelin Pilot Sport Cup 2's with codes of 265/35 20 for the front and 345/30 21 for the rear.[17][7] Michelin Pilot Sport Cup 2 R tyres dedicated for track driving are also available as an option. The braking system uses ventilated carbon-ceramic discs.

Interior

The use of a redesigned monocoque improves leg and headroom in the interior of the Jesko when compared to previous Koenigsegg models. Though weight saving is a priority for interior features, the car is still equipped with amenities such as a climate control system, an infotainment system with a 9.0-inch screen, Apple CarPlay and USB phone charging. The car has unique screens mounted in the steering wheel spokes and a 5.0-inch screen mounted behind the steering wheel displaying vital information to the driver. The seats will be made from hollow carbon fibre but will be electrically adjustable.[14][16]

Exterior

The Jesko shares Koenigsegg's 'Autoskin' capabilities from the Regera, allowing for remote operation of doors and the hood. It is also possible to hydraulically lift the front and rear axles of the car to give additional ground clearance. The doors have been redesigned so that they open further outward and have more ground clearance while open. The roof has screws in order to ensure it remains in place during high speed driving.[16]

Jesko Attack

The Jesko Attack is the high-downforce, default version of the Jesko. This variant has a large rear wing and a large carbon fiber front splitter that Koenigsegg claims to generate 800 kg of downforce at 155 mph, 1000 kg at 171 mph and 1400 kg at its top speed.[10] This car lapped the Gotland Ring in 2:56.97, beating the former record set by a Porsche 911 GT3 RS Manthey-Racing edition by nearly seven seconds.[22] The car also lapped the Laguna Seca in 1:24.86.[23]

Jesko Absolut

Unveiled online alongside the Gemera on 3 March 2020, the Jesko Absolut is a high speed version of the Jesko. The rear wing on the Jesko Attack is replaced by two rear fins which enable a reduction in downforce from 1400 kg to 150 kg and a drag coefficient of. The front splitter and side winglets are removed and the front louvers are smoother with the rear wheels featuring removable covers for high speed stability. The vehicle is also slightly elongated featuring a rear extension which adds 85 mm of additional length. The engine and transmission remain the same as the Jesko Attack. 3,000 hours were spent on the aerodynamic analysis, while an additional 5,000 hours were spent on the design and engineering work of the Absolut. The Absolut will be priced higher than the Attack due to the development work taken to lower the drag coefficient. The Jesko Absolut is estimated by the manufacturer to have a top speed of 500 km/h, with theoretical speeds as high as 531-563 km/h.[24][25][26][27][28]

Sadair's Spear

The Koenigsegg Sadair's Spear is a high-performance variant of the Koenigsegg Jesko. The car was named after Sadair's Spear, a horse, which Jesko von Koenigsegg had in his final race when he was a jockey.[29] Designed primarily for extreme track performance,[30] the "Sadair Spear" is powered by a 5.0-litre twin-turbocharged V8 engine producing up to 1300 hp or 1625 hp when running on E85 biofuel.[31] It features an advanced aerodynamics package, a lightweight carbon fiber monocoque, and Koenigsegg’s proprietary 9-speed Light Speed Transmission (LST), enabling near-instant gear changes. The vehicle emphasizes sharp lines and track-aimed design. On the Gotland Ring it already beats Jesko Attack by 1.1 seconds.[32] Top speed is narrowed to 360 km/h. Production is limited to just 30 units.[33]