4wd – BPA-4R S

The S series comes standard with knurled rollers which provides the highest traction between rollers and tires, a guarantee of an extremely high accuracy in measurement. Especially designed for standard car workshops, test lanes; this series has lower performances than our HP (High Performance) Series, maintaining the same accuracy
and balanced top level components.
Axles synchronization: Electronic linked and synchronized axles via software, made by fast and precise high frequency control of eddy current brakes to synchronize the axles in a 4wd car (Bapro’s patented system).
This to avoid differentials damage and to be more accurate in tests because power wasted in slippage inside the differentials is avoided too. Thanks also to this, BPA-4R S dyno is extremely easy to be installed and the maintenance is almost absent.

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Model BPA-4R S (2017 updated version)
Roller diameter 240 mm
Roller width 660 mm
Maximum speed 250 km/h
Maximum absorbable power 700 HP
Maximum measurable power 1.000 HP (Sweep Power Test)
Overall dimensions mm 3.130 x 4.870 x h. 360
Max weight per axle 2.000
Voltage 220 V 50 Hz


  • 2 Eddy currents brakes, 8 rollers knurled over the entire width, finished by cut knurling
  • Electric adjustment of vehicle wheelbase; pneumatic vehicle lifter, with integrated rollers lock
  • Fully functional management software


  •  Double ventilation system movable on wheels, target power 6 kW, flow rate 44.000 m3/h (4 kW optional)
  • Single ventilation system movable on wheels, target power 3 kW, flow rate 22.000 m3/h (2 kW optional)
  • Wide band lambda system 5 wires wide band lambda probe with controller (Requires outer meteo sensor box)
  • Boost pressure input 0÷2.5 bar relative pressure ± 0.035 bar error. (Requires outer meteo sensor box)
  • Lambda Input connect a vehicle lambda probe with an external controller (Outer meteo sensor box)
  • Aluminum loading ramps high width aluminum ramps. Necessary when test bench installed on the ground
  • Computer trolley built by heavy duty lasting steel, Pro: heavy duty, movable, wide working surface
  • Proportional ventilation speed control adjust the fan speed in function of the rollers speed
  • Infrared remote control test bench management directly from vehicle cockpit
  • 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

Caractéristiques standard

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Les options

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