WRe2
WRe2 is the team’s second electric race car, following a successful line up of 6 internal combustion cars and the first EV WRe1.
Being the team’s first foray into electric powertrain the objective with this car was to maximise the development and learning in the electric powertrain by working on evolving the design of chassis from our previous Internal combustion cars.
The team are aiming for competitive performance in the dynamics with the next generation EV, WRe2, continuing on from the successes experienced with WRe1. WRe2 features all new custom accumulator packs made in-house – a rarity amongst FS teams.
Having spent much development time on motor control and facilitating torque vectoring, the batteries are expected to deliver formidable performance across all dynamic events. Leveraging the team’s experience with topology optimisation, components such as bulkheads, uprights, and brackets have been optimised to the lightest practical mass.
Warwick Racing would like to thank all those involved with the project for their ongoing support.
Performance
| Maximum Power (kW) | 80 |
| Maximum Torque (N·m) | 510 |
| Top Speed (km/h) | 130 |
| Acceleration (0-100) | 3.0 |
| Power to Weight ratio (hp/ton) | 271 |
Dimensions
| Wheelbase (mm) | 1700 |
| Front Track (mm) | 1305 |
| Rear Track (mm) | 1410 |
| Height (mm) | 1225 |
| Weight (kg) | 404.5 |
Chassis & Suspension
| Steel Tubular Spaceframe with optimised wall thicknesses for individual areas and topology optimised aluminium motor cradle and rear bulkhead. Fully TIG Welded in house |
| 41 metres of 4130 25.4mm High Strength Chromoly Steel and 6082 T6 Aluminium |
| Double unequal length wishbones Optimised geometry, caster and anti-dive. Optimised wall thicknesses on the tubing for good stiffness and strength to weigth ratio. Adjustable toe and camber. Pullrod and rocker actuated. Located on the floor of the car to lower the centre of mass and maximise space in the cockpit. FS DSSV Multimatic Motorsports dampers. |
| Adjustable 5 Link layout Optimised geometry and anti-squat. Optimised wall thicknesses on the tubing for good stiffness and strength to weigth ratio. Adjustable toe and camber. Pushrod and rocker actuated. Located behind the powertrain and mounted directly to rear bulkhead. 4 way adjustable Öhlins damper. |
| 6 Piston Radially Mounted Aluminium PFM PFMC019 Caliper 250mm cast Iron Floating Rotors Ferodo Organic Race Compound Pads |
| Optimised 4 piston AP Racing CP4227-2S0 Caliper 220mm drilled steel floating rotors Ferodo Organic Race Compound Pads |
| Bespoke topology optimised and CNC machined aluminium pedal box with twin AP Racing master cylinders for front and rear circuits. Adjustable brake bias. Twin accelerator potentiometers and brake overtravel cut-off switch. |
| Custom Topology Optimised and 5 Axis machined uprights 6082 T6 Aluminium. Include individual wheel speed sensors for data telemtry and traction control. |
| Custom Titan Steering rack with Pro-Ackermann set up. Steel Steering column supported by IGUS lightweight bearings. SPA design steering wheel with quick release. |
| Custom 3-Piece Forced Racing Split Rims 13″ SLR style centre Polished outer rim, brush finished inner rim and anodised centre as standard |
| Avon 7.2/20.0-13 Slick Tyres, A92 Compound |
Body
Battery
|
Total Pack Capacity (kWh) |
7.92 |
|
Maximum Pack Power (kW) |
80 |
|
Maximum Pack Discharge |
310 A for 4s 238 A for 10s 100 A Continuous |
|
Maximum Pack Charge (A) |
20 |
|
Maximum Pack Voltage (V) |
432 |
|
Minimum Pack Voltage (V) |
200 |
|
Cells |
A123 Pouch Cells LiFePO4 |
|
Total Number |
120 |
|
Module Layout |
120s1p |
|
Number of Modules |
10 |
|
Pack Layout |
10 Modules in Series |
|
Battery Management System |
Custom Motorsport-Grade BMS |
|
Safety Measures |
Cell Temperature and Voltage measurements of every cluster of 3 cells
Five Battery Pack Isolation Relays Insulation Monitoring Device to ensure integrity of wiring Amphenol High Voltage Quick Disconnect |
| Motor | 2 Emrax 208s 3 Phase Axial Flux Inboard Outrunner and Water cooled. |
| Inverter | 2 emDrive H300 Inverters for torque vectoring of rear wheels CAN Bus Controlled. |
| Vehicle Control Unit | Custom Teensy 4.1 Based Solution, all communication outside accumulators occurs through CAN buses. |
| Differential | Drexler Mechanical Limited Slip Differential |
| Transmission | 512 Chain Renthal Sprocket Gear Ratio: 3.43 |
| Cooling System | Single Radiators with aerodynamic ducting with variable speed electric pump |
| Overall Vehicle Safety Systems | Custom PCB for Traction System Active Light Custom PCB Brake Plausibility Device Motorsport UK approved cut off switches |
| Low Voltage Battery | Lightweight LiPO Battery |
| Dashboard | State of Charge Displays Variable Drive Modes (Economy & Race) |
| Wiring Harness | Designed on Eplan Circuit Schematics Software Manufactured in House |
| Data Logger | Aim Evo 5 Data logger with GPS 08 |
| Vehicle Dynamics Sensors | Central Accelerometer, GPS Speed Sensor, Individual wheel speed sensors and Individual wheel suspension displacement sensors. |
| Driver Sensors | Steering Angle Sensor, Brake System Pressure Sensor and Accelerator Position Sensor |
| Powertrain Sensors | Battery State of Charge, Cell temperature, Cell voltage, motor temperature, motor speed, motor position, inverter temperature… |