SPR25evo Roxy

Season 2025

Performance enhancement of the proven concept

140 kW

Motor power

880 NM

Torque

220

Total weight

Engine

Motor: 4x AMK DD5-14-10-POW synchronous motors
Maximum motor torque: 21 Nm
Maximum engine speed: 20000 rpm
Maximum motor power: approx. 35kW at 16000 rpm
Cooling with 3D-printed cooling jackets & cooling plates
Individually adjustable all-wheel drive with four wheel hub motors
Reduced stepped planetary gearbox (i=10.47)
Maximum wheel torque Tmax = 220 Nm
Maximum speed approx. 140 km/h
Maximum system output: 80 kW
Milled wheel carrier and wheel hub made from EN-AW7075

Suspension

Pushrod system in which springs and dampers are arranged longitudinally to the vehicle (deflection via rocker)
Stabilizers on front and rear axle
Suspension: Double wishbone suspension made from CFRP tubes and 3D-printed aluminum
Various Ackermann geometries thanks to multiple connection points on the wheel carrier
Self-developed steering gear
Self-developed 10 inch aluminum rims
Tires: Hoosier R25B 16×7.5-10

Electronics

3x CAN-Bus
Self-developed 600V high-voltage battery
Battery capacity: 7.8 kWh
Self-developed HV & LV battery management unit
Freely configurable HMI (Human Machine Interface)
Optimized cable routes (automotive standard)
Replaceable wiring harness
On-board power supply: 24 V (via self-developed LV accumulator)
Data logging, telemetry

Chassis

Full carbon monocoque in sandwich construction with foam and aluminum honeycomb core
Laminated front roll bar
Torsional rigidity: 4000 Nm/°
Weight: 26 kg
Aero- and weight-optimized
Firewall: 1 mm aluminum and aramid
Crashbox: Aluminum honeycomb

Aero

Further developed aerodynamics package
Total weight: 14.1 kg
Front & rear wing
Side boxes improve flow to the radiators
Downforce: 650 N at 60 km/h
Balance adjustable from neutral to 48:52

A racing car rarely drives alone.