The Spark-Renault SRT_01E, also known as the SRT01-e (since the 2015–16 season) or the Spark Gen1 (after the introduction of the successive Gen2 chassis), was an electric formula race car designed for the inaugural season of Formula E, in 2014–15. The car was the result of a 10-month collaboration between Spark Racing Technology, McLaren Electronic Systems, Williams Advanced Engineering, Dallara and Renault. The car was used until the end of Formula E's fourth season in 2018, after which it was replaced by the SRT05e.
Development
Development of the car started in September 2012. Lucas di Grassi was appointed as official test driver, demonstrating the prototype, the Formulec EF01 (built in 2010). The Formulec EF01 featured a chassis constructed by Mercedes GP and motors built by Siemens. The car was used for the official promotion video and for demonstrations in host cities.
On 1 November 2012, McLaren Electronic Systems was announced to provide the electric motor, transmission and electronics for Formula E. The Formula E organisation ordered 42 cars from Spark Racing Technology. For this order Spark partnered with well renowned formula car manufacturer Dallara.
Michelin was announced as an exclusive tyre-supplier on 28 March 2013. On 15 May 2013 Renault was announced as technical partner of Spark Racing Technology. Renault's experience in the Renault Z.E. (Zero Emission) and Formula One programmes will be used to put to Formula E's advantage. On the same day, Formula E unveiled the design of the Spark-Renault SRT_01E.
The battery design was in the hands of Williams Advanced Engineering, part of the Williams Group to which the Formula One team belongs.
At the Frankfurt Motor Show, on 10 September 2013, the Spark-Renault SRT_01E was revealed by FIA president Jean Todt and Formula E Holdings CEO Alejandro Agag.
On 3 July 2014, the first official trial of the cars took place in Donington Park, England. The trial ended around 21 August with each team running all four of their cars completing a combined total of 1222 laps. The fastest time was 1:29.920, recorded by the Abt team – a McLaren MP4-12C recorded a lap time of 1:29.679 during the 2012 British GT season.
Technology
RESS
The Spark-Renault SRT_01E featured a Rechargeable Energy Storage System (RESS). According to Appendix J article 251 3.1.7 of the ISC, the RESS is the complete energy storage device, comprising an energy storage medium (e.g. flywheel, capacitor or battery). The design of the RESS is free but must be homologated by the FIA. Part of the RESS is the traction batteries and the Battery Management System, these are supplied by Williams Advanced Engineering.
Electric motor
The electric motor is built by McLaren Electronic Technologies. The motor weighs 26 kg and produces a maximum of 270 bhp with 140Nm of instant torque. The motor was originally developed for the McLaren P1 road car.
Charging
According to the regulations, the Formula E cars can be charged during practice, qualifying, the race and some other specified moments during a raceweekend. Drayson Racing and its technical partner QualcommHALO are developing a way to wirelessly charge the car. The wireless electric vehicle charging (WEVC) system uses a pad under a parking space to charge the car. The system is tested on the electric Drayson B12/69EV, a modified version of the Lola B08/60.
Tyres
The car was shod with 18-inch tyres. The FIA Formula E championship uses a tyre which is suitable for wet and dry conditions. The exclusive tyre supplier Michelin will only make one compound available, so there will be no hard or soft compounds like in Formula 1. The tyre is expected to last the whole race weekend.
Technical specifications
Design
Aerodynamics optimized to facilitate overtaking
High ride height sensitivity and wide range of suspension set up possibilities to tackle the city centre streets Cost-effectiveness Compliant to FIA safety regulations
Technology
Use of latest technology
Compromise between performance and cost-effectiveness wherever possible
Extensive use of composite materials but limited usage of the most expensive carbon-fibres
Dimensions
Overall length: (max) Overall width: (max) Overall height: (max) Track width: (min) Ride Height: (max) Overall weight (inc driver): (min) // Batteries alone