4WD – BPA-4R HP Linked

HP series is Bapro’s highest performance chassis dynamometer. Four all connected 400 mm diameter rollers per each axle guarantee the top repeatability and accuracy. With a massive tubular frame made of high strength steel, this High Performance series suits all needs: Testing, R&D, Motorsport, Tuning and Chip Tuning.  BPA-4R High Performance is suitable for any kind of power and torque levels. Axles rigid connection: realized through bevel gearboxes and cardan shaft. The front-rear connection system can be completely deactivated with a button on the remote control. The disengagement disconnects both transmissions, then the cardan shaft stops completely (i.e. the linked dyno transforms into synchronized dyno Bapro BPA-4R HP so no parts are rotating when it is not needed).

✔️ Used by electric vehicles’ manufacturers.


Mechanical features:

  • Roller diameter: 400 mm
  • Roller width: 700 mm
  • Balance quality grade G 2.5
  • All the mechanics is laser aligned
  • Overall dimensions mm: 4360 x 3470 x 460, exactly the same as the model BPA-4R HP
  • Max weight per axle: 2.500 kg
  • Direct mechanical link between the front and rear axles, which can be totally disabled by software
  • Oversized connection components to guarantee a long life over time


  • Maximum speed with link activated 250 km/h
  • Maximum speed with link disabled 360 km/h
  • Maximum adsorbable power 1.300 HP (Endurance tests)
  • Maximum measurable power 2.000 HP (Sweep power tests)
  • Maximum traction force 16.000 N

Power supply:

  • voltage 3/N/PE 400 VAC
  • frequency 50 Hz
  • fuses 16 A
  • compressed air 6 bar


  • Shorter repair time (fast and exact diagnosis)
  • effective use of the instruments already present in workshop (diagnosis equipment, gas analyzer)
  • Avoid any risks from road tests (traffic, accidents, fines)
  • Results certification (performance enhancement)
  • Accessories sale improvement by result verification (exhaust systems, efi controller etc..)
  • Second-hand vehicles sale improvement by engine health certification
  • Vehicle check before second-hand trades
  • Renting for tests and technical checks

Measuring program:

  • Transmission verification (clutch slippage)
  • Power step test
  • Power sweep test
  • Cooling system check (radiator, fan sensor, thermostatic valve)
  • Diagnosis by gas analyzer under load
  • Vehicle test with constant speed
  • Vehicle test with constant force
  • Vehicle test with constant load
  • Road simulation (slope, drag resistance, weight)
  • Vehicle test with constant RPM
  • Durability tests
  • Engine mapping to all RPM
  • Diagnosis by scantool during road simulation
Standard features
  • 2 Eddy currents brakes; 8 rollers paired with HTD belts, knurled over entire width, finished by cut knurling
  • 2 bevel gearboxes
  • 1 cardan shaft with extension for adaptation to the wheelbase of the vehicle
  • Infrared remote control test bench management directly from vehicle cockpit
  • Lambda Input to connect the vehicle lambda probe or an external controller
  • Boost pressure input 0÷2.5 bar relative pressure ± 0.035 bar error
  • Fully functional management software; Pneumatic vehicle lifter, with integrated rollers lock
  • Electric adjustment of vehicle wheelbase
Optional features
  • Double ventilation system movable on wheels, target power 6 kW, flow rate 44.000 m3/h
  • Single ventilation system movable on wheels, target power 3 kW, flow rate 22.000 m3/h
  • Lambda kit: 5 wires wide band Lambda probe and controller
  • High width aluminum loading ramps. Needed when the dyno is installed on ground
  • Computer trolley built by heavy duty lasting steel, Pro: heavy duty, movable, wide working surface
  • Proportional ventilation speed control adjusting the fan speed in function of the rollers speed
  • Roller covers protect the rollers when the dynamometer is not working
  • Personal computer and display
  • Safety Equipments: Side safety barriers with logo panels, Anchoring ratchet straps, High attenuation ear muff
  • OBDII parameters reading and dtcs deleting without the need for additional hardware and dedicated interfaces.

Optionals in details

Comparative table
Maximum speed 360 km/h 360 km/h 200 km/h 250 km/h 250 km/h
Maximum adsorbable power 650 HP 1300 HP 400 HP
Maximum measurable power 1000 HP 2000 HP 900 HP 400 HP 800 HP
Maximum traction force 8000 N 16000 N 16000 N
Mechanical features
Rollers diameter 400 mm 400 mm 400 mm 240 mm 240 mm
Rollers width 700 mm 700 mm 700 mm 660 mm 660 mm
Roller balancing grade G 2.5 G 2.5 G 2.5 G 2.5 G 2.5
Equivalent base inertia 450 Kg 900 Kg 550 Kg 240 Kg 480 Kg
Dimensions 3470×1135 mm 4360×3470 mm 3470×5300 mm 3070×870×310 mm 4160×3130 mm
Deck height 410 mm 460 mm 640 mm 360 mm 360 mm
Weight 2500 kg 2500 kg 2000 kg 2000 kg
Voltage 400 V 50 Hz 3/N/PE 400 V 50 Hz 3/N/PE 400 V 50 Hz 3/N/PE 220 V 50 Hz 1/N/PE   220 V 50 Hz 1/N/PE  

Car Dynos 4WD – BPA-4R HP Linked - Basic Configuration

Car Dynos 4WD – BPA-4R HP Linked - Plus Configuration with double brake