The car has much more down force and the Michelin tyres have better grip and unlike an F1 car isn't at the ragged end of performance.
The cars have been designed with close racing in mind rather than outright speed and are very stable under heavy braking, especially with the newly fitted carbon brakes, which last a lot longer than the old steel brakes used last season.
In the cockpit, things have changed. The clutch is now on the steering wheel along with the gearshift paddles. The idea is to use the right paddle when turning left and the left paddle when turning right, because either one will be near the top of the steering wheel when turning.
As a result of moving the clutch to the steering wheel, there are only two pedals on the floor. Some drivers will have to master the art of left-foot braking.
There's also an extra 60bhp on tap when the PowerBoost button is pushed. Each driver is allowed to push the boost button on the steering wheel for one lap during qualifying and a pre-determined number of times during the sprint and feature race.
* Under the hood
Engine configuration: 90 degree V8
Displacement: 4500cc
Max Torque: 406 lbs ft/550 Nm
Max Power: 600 bhp/448 kW
Clutch: AP three-plate carbon/carbon with steel hub
Gearbox: Six-speed longitudinal sequential. Gear selection via a Magneti Marelli paddle shift system
Weight: Approx 720kg including driver, race ready (excluding fuel)
Front and rear suspension: Double wishbone with pushrod operated coil over damper units.
Chassis: Carbon fibre skins, aluminium honeycomb core.
Brakes: Brembo carbon discs, six-pot aluminium callipers
Wheels: Front 13" dia. x 12". Rear 13" dia. x 14"
Tyres: Michelin control slick and treaded wet tyres