ET4 (ETken): Think beyond your ken!


ET4 is the fourth car made by the E-Team Squadra Corse. A great improvement of the ET3.ET4_kenspec



Name: ET4
Year: 2011
Colours: Black, green, white and red


Lenght: 2630 mm
Width: 1388 mm
Height: 1020 mm
Mass: 210 kg
Wheelbase: 1640 mm
Front track: 1220 mm
Rear track: 1150 mm

Suspensions and tires

Suspension type: Double unequal length A-Arm. Push rod actuated laterally oriented spring-dampers; anti-roll bar
Tires: Hoosier 20.5×7-13
Rims: 7” channel, Al-Mg cast rims
Hubs and uprights: Self made, Al 7075
Spring dampers: Öhlins TTX 25 FSAE, 5 spring series
Anti-roll bars: 8 settings, front and rear
Steering system: Pinion-rack system

Brake system

Rotors: Cast Iron, hub mounted, 240mm outer diameter, 180mm inner diameter
Master Cylinder: Tilton 15,88 mm bore front / 23,81 mm bore rear with adjustable bias
Calipers: 28 mm dia., Dual piston, floating (front). 30,2 mm dia., single opposing piston, fixed (rear)


Frame construction: Tubular space frame
Material: AISI 4130 steel round tubing, 1.125” dia / 1” dia / 5/8” dia, various thickness
Joining method and material: TIG welding


Body: 12 pieces of Carbon Epoxy Body


Model: Aprilia 550 SXV
Bore: 80 mm
Stroke: 55 mm
Cylinders: 2
Displacement: 549cc
Lubrification: Dry sump with external oil tank and separate gearbox lubrication
Compression ratio: 12:1
Throttle Body / Mechanism: AT Power 28mm, double return spring, idle engine regulation
Intake System: Optimized intake system, carbon fiber duct, plenum built with rapid prototyping technologies and two separate manifold
Fuel Type: 100 Octan, Gasoline
Fuel System: 2 Delphi injectors
Cooling system: Double side radiators with thermostatic electric fan
Exhaust System: 2-1 exhaust system, Titanium and Carbon-fiber LeoVince muffler


ECU (Engine Control Unit): Athena HPUH4 with lambda sensors and launch control
GCU (Gear Control Unit): Student built, microcontroller based, gear and clutch management
DLS (Data-logging System): Race Technology DL1 with gyro
Driver Interface: Race Technology DASH3, custom made shift paddles, multifunction pushbuttons


Clutch: Rekluse z-Start Pro Clutch, automatic and manual
Gearshift: 5-speed semiautomatic sequential gear, pneumatically-actuated
Differential: Drexler, clutch pack limited slip
Final ratio: Adjustable 2.75-2.81-3.00-3.07-3.2-3,29