4000 Axle-Hub Dyno

2WD | Axle-Hub Dynamometers | Eddy Current Dynamometers |


4,000+ Hp** unit includes: Pair of heavy-duty rolling modules with dual eddy-current controllers and overdriven quad high-speed (high inertia) air-cooled absorbers, automatic camber compensation, thermostatically-controlled fans, dual torque transducers, swivel casters, alloy quick-change axle-flange adapters, DYNOmite-Lite data-acquisition computer, axle and engine (ignition) RPM pick-ups, Auto-Load Control, 3-channel data harness, DYNO-MAX software, atmospheric correction, banner, accessories package, and manual (less PC).


DYNOmite Data-Acquisition Computer  

Hardware configuration

Expandable, hybrid (surface-mount and thru-hole) multi-layer board system

Voltage requirements (DAQ only)

Runs on 120-volt 60-Hz AC, 240-volt 50-Hz AC, or 12-volt DC (specify)


CE and/or UL approved (per locale)

Board type and channel capacity

Pro, PC linked − 3 channel

Expansion capacity upgrades

Optional 28, 56, or 112+ channel capable subsystem

Data rate

User-selectable rates up to 200 (1,000 optional) recordings per second (per channel)

Transducer wiring interface

Quick-disconnect data harness − 3-channel


Non-volatile setup memory

Atmospheric correction rate

Standard, SAE, DIN, JIS, ECE, J1995, Custom

Gear-ratio RPM and shifting compensation

Smart Ratio™ automatic ratio calculation with multiple, simultaneous, RPM inputs

Recording features

Smart Record™ automated recorder triggering

Data interface

User selectable, USB or RS-232 serial port, output to a PC  − via DYNO-MAX software option

Third-party data-output interface options

Free Windows driver for National Instrument’s Lab View™ available

Temperature sensor

0 to 255 Fahrenheit [-18 to 124 Celsius] thermistor (optional)

Standard and optional sensor inputs

RPM, speed, torque, frequency, flow, thermocouples, thermistors, 0-5 volts, Lambda, position, etc.

Standard and optional control outputs

Ignition shut-off, relay control, load-control stepper output, 0-5 volt D/A, etc.

Torque Transducer  


Environmentally sealed dual S-beam load cells

Maximum displayed torque

Unlimited ft-lbs [N-m] − real-time and playback

Load-cell range

0 to 2,000 pounds (each) [0 to 907 Kg] (other ranges available)

Load-cell signal-output gain

3 millivolts/volt

Load-cell resolution

Better than 0.04% of full-scale accuracy − typical

Strain gauges

Linearized full-bridge strain gauges in balanced Wheatstone bridge

Advanced linearization (software)

User-configurable edit table (interpolated deviation map)

System torque resolution

Better than 0.2% of full-scale accuracy − typical

Calibration features

Semi-automatic calibration of zero offset

Drift stabilization

Ratiometric supply-voltage and temperature compensation

Axle-Hub Frame  


Heavy-duty rolling modules

Mechanical frame construction

Fully-welded monocoque steel frame, swivel caster, greaseable bearings (camber compensated)

Track width (max / min)

No maximum or minimum limits

Absorber coupling

Inline 1:1 ratio


Portable rolling modules, plug-in wiring, automatic camber compensation

Hub Adapters

Includes pair of triple-pattern vehicle-axle to dynamometer-flange alloy adapters (additional-pattern adapters optional)


Air-vented rotors, and thermostatically-controlled electric fans

Power requirements

230-volts AC @ 60-Hertz [or 50-Hertz] (20-amps)

Axle Weight Capacities  

Maximum dynamic load

4,000 pounds [1,814kg] (per axle pair)

Maximum static load

4,000 pounds [1,814 kg] (per axle pair)

Rotating Mass  

Effective inertia range

Low inertia (to allow absorber simulations)

Minimum simulated vehicle mass

250 pounds [113 kg] typical (excluding absorption simulation)

Minimum balance tolerance

G2.5 via integral, multi-plane, dynamic spin balancing

Secondary flywheel inertia


Optional ACtive-Sync Motoring

Bolt-on belt-driven AC motoring option for simulating down-hill coasting and traction-control motoring

Power Capacity (temp dependent)*  


*Power capacity is speed and temperature dependent.

Rolling-road’s diameter at tire contact-patch

None (direct-to-axle coupling)

Tire deformation limits

None (direct-to-axle coupling)

Maximum displayed power

Unlimited Hp [Kw] − real-time

Maximum inertial power (see note)

Unlimited Hp [Kw] (Note: low-inertia offers minimal inertial resistance – except in highest gear)

Maximum tractive force (cold)

Not Applicable (direct-to-axle coupling eliminates all tire deformation and slippage)

Typical inertial power range (cold)

5 to 2,200+ Hp [4 to 1,641+ KW] (Note: low-inertia offers minimal inertial resistance – except in highest gear)

Typical inertial torque range (cold)

1 to 6,500+ Ft-Lbs [1 to 8,813+ Nm] (Note: low-inertia offers minimal inertial resistance – except in highest gear)

Peak steady-state power

1,500+ Hp [1,119+ KW] initial − cold absorber rating (see absorber’s load chart)

Typical steady-state power range / time

5 to 1,000+ Hp [4 to 746+ KW] extended − warm absorber rating (see absorber’s load chart)

Engine (and Absorber) Tachometers  


0 – 32,000+ RPM real-time display (user reconfigurable)

Timing reference

Quartz-crystal calibrated


1.0 RPM (typical)

Primary RPM signal

Supports direct connection to most standard vehicle tachometer sources

Signal compatibility

User adjustable trigger voltages − pulse type selectable from ½ to 12 PPR

Alternate signal sources

“Clamp-on” inductive (spark plug, injector, or coil) wire pickup (included)

Analog tachometer options

Optional “cigarette lighter” and optical RPM pickups

Digital tachometer options

Optional OBD-II tachometer interface

Dyno Speedometer  


0.0 – 255.0 MPH [0.0 – 410.0 km/h] − real-time digital (user reconfigurable)

Timing reference

Quartz-crystal calibrated


Better than 0.1 roll RPM (typical)

Standard signal source

Hall-effect pulse type for RPM/MPH pickup (standard)

Signal compatibility

User adjustable trigger voltages − pulse type selectable from 1 to 360 PPR standard

Speed Range (tire deformation limited)  

Axle RPM vs. vehicle speed factor

~14 RPM per MPH [7 RPM per km/h] (exact user-configurable value is dependent on vehicle’s tire diameter)

Digital speed range

0 – 255 MPH [0 – 410 km/h] real-time display (user reconfigurable)

Rolling-road’s tire contact-patch diameter

 Not Applicable (direct-to-axle coupling eliminates all tire deformation and slippage)

Safe speed range

7 – 250 MPH [11 – 402 km/h] (direct-to-axle coupling eliminates all tire deformation and slippage)

Load Control (absorption units only)  

Absorber coupling

Inline 1:1 ratio

Absorber speed / RPM regulation

Electronic auto-load control (closed-loop PID) − with full road-load simulation

Absorption method

Electric air-cooled eddy-current absorber with pulse-width-modulated DC controller

Automated braking

Yes − Smart Braking™ (via DYNO-MAX)

Bidirectional capable

Yes (at 15% of forward ratings)

Power requirements (for absorber)

20-amps @ 240-volts AC @ 60-Hertz [or 50-Hertz]

Approximate Dimensions and Weight (Do not install any circuits or fixtures until system is on site)

Axle-hub assemblies

Dual heavy-duty multi-bearing frames (powder coated) − dual eddy absorbers (one per side)


50″ [127 cm]

Length (less adapter)

37″ [94 cm]

Length (with typical adapter)

40″ [414 cm]

Height (at wheel well)

23″ [58 cm]

Height (overall)

28″ [71 cm]


1,250 pounds [567 kg] (approximate uncrated − each)

Dynamometer Control Software  


Too many to list here − review DYNO-MAX specification pages and demo CD download

Notable trademarks

DYNO-MAX, Smart Ratio, Smart Record, Smart Load, Smart Braking, Smart Print, etc.

Software versions

DYNOmite EEPROM version # 9.977 plus DYNO-MAX version #10.23 (included)
Control Console and PC Options  

Computer housing

Optional enclosed (EMI/RFI resistant) rolling PC cabinet


Optional “Pro” console with genuine Intel-equipped Dell PC and 17″ LCD display

Wireless remote operation

Pocket DYNO-MAX™ − wireless Windows Mobile™ PDA control software (included in DYNO-MAX “Pro“)

Data Collection Options  

Air/fuel ratio monitoring

Optional 9-19 range AFR exhaust-gas module with portable vacuum pump and tailpipe “sniffer”

Dynamometer control software

Optional DYNO-MAX software packages (see separate specifications page and demo CD)

Electronic throttle control

Optional unit allows PC to throttle road and track driving simulations (dead man or console mount designs)

Exhaust-emissions analyzer

Optional five-gas analyzer (O2, CO, CO2, HC’s, and NOX) via digital DYNO-MAX RS-232 link.

OBD-II link

Optional OBD-II (wired and wireless) interfaces for RPM, MPH, TPI, etc.

Temperature monitoring

Optional oil-temperature “dip stick” thermocouples

Weather station module

Optional weather station provides automatic entry of air temperature, barometric pressure, and relative humidity.

Other Options  

ACtiveSync Modules

Optional AC motoring units match un-powered axle speed (on traction-controlled ABS-equipped vehicles) during 2WD dyno testing


Optional 42″ 13,300 CFM (120-volts @ 60-Hertz 1φ) test-bay cooling fan

Model Number: #044-400-1K

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