Formula E car

A Formula E car is a battery electric open-wheel auto racing car made according to the regulations of the International Automobile Federation to take part in the FIA Formula E Championship. Races are mainly driven on closed temporary street circuits designed specifically for this racing category.

Generations

As of 2024 there have been three major generations of Formula E cars:

1st generation
* 1st season: 2014–15
* 2nd season: 2015–16
* 3rd season: 2016–17
* 4th season: 2017–18
2nd generation
* 5th season: 2018–19
* 6th season: 2019–20
* 7th season: 2020–21
* 8th season: 2021-22
3rd generation
* 9th season: 2022-23
* 10th season: 2023-24

1st generation (2014–15 to 2017–18)

Even though the FIA originally planned for the category to be open to various chassis manufacturers, the only licensed Formula E model for the inaugural season was the Spark-Renault SRT 01E. The electric components were assembled by Renault while the chassis was designed by Dallara, and the car was assembled by Spark Racing Technology.
In Season 2, the SRT_01E was opened up for private development by the teams when it came to the motor, gearbox and suspensions.
The specifications for the Spark-Renault SRT_01E are:

Property	Value
Acceleration	from
Top speed	225 km/h
Chassis material	Carbon fiber and aluminium monocoque
Body material	Kevlar and carbon fiber
Aerodynamic elements	Spoiler and airdam
Electric motor	Season 1: McLaren Electronic Systems Season 2 onwards: Various, from single-speed to 5-speed
Motor power	200 kW in normal race mode
Energy source	28 kWh Lithium-ion battery by Williams Advanced Engineering
Powertrain layout	Rear-wheel drive, center back motor position
Gearbox	Season 1: Hewland 5-speed sequential gearbox Season 2 Onwards: Various gearboxes
Gearbox controls	Semi-automatic wheel-placed paddle shifters
Suspension	Front: Double steel wishbones, pushrod operated with twin dampers and torsion bars Rear: Spring
Shock absorbers	Torsion bars and springs
Brakes	Disks and calipers of any material. Round sections in aluminium alloy
Rims	460 mm diameter Magnesium OZ Racing rims
Tires	650 mm diameter front, 260 mm wide 690 mm diameter back, 305 mm wide Sculpted Michelin tires
Length	5000 mm
Width	1800 mm
Height	1250 mm
Track	1300 mm
Wheelbase	3125 mm
Mass	898 kg total mass 200 kg battery mass

2nd generation (2018–19 to 2021–22)

In March 2016 it was decided by the FIA and Formula E Holdings that the upcoming 2nd generation cars would keep to a specification chassis in a bid to keep costs low in the category. The tender for the 2nd Generation car was won by Spark Racing Technology.
The original battery specifications included a cell-weight limit, a 200 kW peak power limit, and a maximum usable energy of 28 kWh. For the 2018–2019 season, the specifications for the battery was a weight of 250 kg and 54 kWh energy, and peak power was 250 kW. The cells was to be made by Murata Manufacturing, the integration by Lucid Motors, and track handling by McLaren.
Also new for the generation 2 cars was the inclusion of a halo crash protection device.
The specifications for the Spark SRT05e are:

Property	Value
Acceleration	from
Top speed	280 km/h
Chassis material	Carbon fiber and aluminium monocoque
Body material	carbon fiber
Aerodynamic elements	Spoiler and airdam
Engine	Various
Engine power	200 kW in normal race mode
Energy source	54 kWh battery by McLaren Applied Technologies
Powertrain layout	Rear-wheel drive, center back engine position
Gearbox	Various single-speed gearboxes
Suspension	Double steel wishbones
Shock absorbers	Torsion bars and springs
Brakes	Front: 278 mm Brembo carbon disks and calipers Rear: 263 mm Brembo carbon disks and calipers with brake-by-wire
Rims	460 mm diameter rims
Tires	650 mm diameter front, 260 mm wide 690 mm diameter back, 305 mm wide Michelin Pilot Sport All-Weather Treaded, one set per weekend
Length	5160 mm
Width	1770 mm
Height	1050 mm
Track	1553 mm front, 1505 mm rear
Wheelbase	3100 mm
Mass	900 kg total mass 385 kg battery mass

3rd generation (from 2022)

The 3rd generation of Formula E cars is expected to be lighter and smaller than the 2nd generation cars to allow for more wheel-to-wheel racing. It will be the first formula car with both front and rear powertrains, with a 250 kW generator in the front being used for regenerative braking and a 350 kW engine in the rear for powering the vehicle. It will be the first formula car not to feature rear hydraulic brakes, and will instead rely on the regenerative capabilities of the engines for braking on the rear wheels, and it is claimed that "at least 40% of the energy used within a race will be produced by regenerative braking during the race". This contributes to the car, at the launch in 2022, being expected to become the world's most energy efficient race car ever. Performance wise, the 3rd generation Formula E cars are expected to achieve around 2 to 4 seconds faster lap times in both qualifying and races compared to the 2nd generation cars.
The specifications for the 3rd generation Formula E cars are:

Property	Value
Top speed	320 km/h
Chassis material	Carbon fiber and aluminium monocoque
Body material	Linen and carbon fiber, of which some is recycled carbon fibre from retired Gen2 cars
Aerodynamic elements	Spoiler and airdam
Engine power	350 kW
Energy source	Battery cells with sustainably-sourced minerals; reused and recycled at end of life 600 kW total power potential from regenerative braking
Fast charging	600 kW ultra-high speed charging, almost twice as fast as any commercially available charger
Powertrain layout	Front- and rear-mounted engine
Gearbox	Various single-speed gearboxes
Suspension
Shock absorbers
Brakes	Front: Disks and calipers Rear: Non-hydraulic, regenerative
Rims	460 or 510 mm OZ Racing magnesium wheels
Tyres	Tyre compound with 26% natural rubber and recycled fibres; recycled after racing
Length	5016 mm
Width	1700 mm
Height	1023 mm
Track
Wheelbase	2970 mm
Mass	840 kg total mass

4th Generation (2026 onwards)

The Generation 4 car is set to make its debut at the 2026/27 season.It will run in permanent four-wheel-drive specification as opposed to the current car, where four-wheel drive is only active in the duel phase of qualifying, the race start, and in attack mode.

Transmission

During the first season in 2014–2015, all teams used a Hewland 5-speed sequential gearbox operated by the driver semi-automatically via paddles on the steering wheel similar to other racing series. In the following seasons, regulations on gearboxes have been relaxed, and some teams have chosen to use either single-speed gears or all the way up to four gears. A transmission with multiple gears can help keep the motor in its most efficient operating range, but whether an electric car needs multiple gears in the transmission depends heavily on the torque curve of the motor at different rotational speeds. By season 4 in 2017–2018, all teams were running single-speed gearboxes. Some single-speed Formula E cars have sometimes erroneously been described as having a "direct-drive" powertrain. However, FIA regulations for the gen 1 and 2 car have mandated a reduction gear, and Formula E cars without multi-speed gearboxes have thus far had a single-speed gear rather than a true direct-drive mechanism. Gen 4 cars will run in permanent four-wheel-drive specification as opposed to the current car, where four-wheel drive is only active in the duel phase of qualifying, the race start, and in attack mode.

Sound

The second generation Formula E car from 2017 had a noise level of about 80 decibels, which is 10 dB louder than an average petrol road car or about as loud as a domestic vacuum cleaner.