850-Pro UTV/SAE EC Dyno

Chassis Dynamometers | Eddy Current Dynamometers |


850* “Pro” eddy-current dynamometer system includes: heavy-duty formed steel and diamond-tread frame with low-profile 16″-diameter x 64″ extra-wide medium-inertia roll assembly – with machined-in “traction grooves,” mobile casters, leveling pads, tie downs, dual quick-remove ramps, eddy-current absorber and controller with overdrive, S-beam load cell, DYNOmite-Pro data-acquisition computer, inductive RPM pickup, DYNO-MAX “Pro” software, color printer, Windows 7-equipped Dell laptop, swinging console boom, auto-load control, AFR module (with pump), weather station, high-velocity cooling fan, 28-channel data harness, temperature thermistor, banner, accessories package, and manual.


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 − 28 channel

Expansion capacity upgrades

Optional 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 S-beam load cell

Maximum displayed torque

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

Load-cell range

0 to 300 pounds [0 to 136 Kg] (other ranges available)

Load-cell signal-output gain

3 millivolts/volt

Load-cell resolution

Better than 0.02% 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 0.1% of full-scale accuracy − typical

Calibration features

Semi-automatic calibration of zero offset

Drift stabilization

Ratiometric supply-voltage and temperature compensation

Roller Frame  


Extra-wide, medium-inertia, ~16″ [~40 cm] diameter (nominal) roll

Mechanical frame construction

Fully-welded monocoque steel frame, leveling pads, hinged diamond-plate access panels, access anchoring points, greaseable bearings (pit-plate optional)

Tire stop/support

Quick-clamp adjustable-wheelbase ( ) front-tire stand with integral ratchet strapping − longer-wheelbase options available

Track width (max / min)

64″ [163 cm] (with all-three hinged deck-plate covers open)

Absorber coupling

Overdriven @ 2.03:1 ratio


Above ground with integral leveling pads and wheels, or in ground with (optional) deck plate and integral anchoring points


Dual heavy-duty, lightweight-aluminum, ramps (included)

Pneumatic requirements (for air brakes only)

90 PSI [600 kPa] @ 3 CFM [5 meter^3/hr]

Power requirements, frame only (option)

115-volts AC @ 60-Hertz [or 230-volts @ 50-Hertz] (specify voltage) for optional electric wheelbase-adjuster actuator

Axle Weight Capacities  

Maximum dynamic load

1,000 pounds [453 kg] (per axle)

Maximum static load

1,000 pounds [453 kg] (per axle)


Effective inertia range

Medium inertia (to allow absorber simulations)

Minimum simulated vehicle mass

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

Minimum balance tolerance

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

Steel-roll construction

Monocoque with 360-degree welded end plates and 100% machine-finished thru-shafting

Roll-to-tire contact area’s surface finish

Machined-in “traction grooves” for maximum grip  (μ > 1.0) and tire life under high-power testing

Power Capacity (traction limited)*  


*Power capacity is unlimited, but subject to roll diameter-induced tire deformation (safety) and traction (efficiency) limits.

Rolling-road’s diameter at tire contact-patch

~16″ [~40 cm] (see tire manufacturer’s “dyno tire vs. roll-diameter safety guide”)

Tire deformation (due to roll’s diameter)

1¼” [32 mm]  tire indentation (approximate) required for 5″ contact-patch length on typical automotive tire

Maximum displayed power

Unlimited Hp [Kw] − real-time

Maximum inertial power (traction limited)

Unlimited Hp [Kw] (but subject to roll diameter’s tire deformation and traction limits)

Maximum tractive force (traction limited)

Unlimited lbs-force [kN] (but subject to roll diameter’s tire deformation and traction limits)

Typical inertial power range (traction limited)

6 to 385+ Hp (500 / 1.3″deform*μ*2wd) [4 to 287+ KW] limit @ μ = 1.0

Peak steady-state power

180+ Hp [134+ KW] initial − cold absorber rating (see absorber’s load chart)

Typical steady-state power range / time

3 to 100+ Hp [2 to 75+ 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 optical RPM pickup

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)  

Rolling-road’s tire contact-patch diameter

~16″ [~40 cm] (see tire manufacturer’s “dyno tire vs. roll-diameter safety guide“)

Roll RPM vs. vehicle speed factor

21.0 RPM per MPH [13.0 RPM per km/h]

Digital speed range

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

Safe speed range (tire deformation limited)

6 – 163 MPH (186sr / 1.3″^.5deform) [10 – 262 km/h] (subject to roll diameter’s tire-deformation limits)

Load Control (absorption units only)  

Absorber coupling

Overdriven @ 2.03:1 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)

Power requirements (for absorber)

30-amps @ 120-volts AC @ 60-Hertz [or 20-amps @ 240-volts @ 50-Hertz optional] (specify)

Approximate Dimensions and Weight (Do not cast any pits, etc. until system is on site)

Roller assembly

Extra-wide roll ~16″ [~40 cm] multi-bearing frame − eddy absorber


72″ [183 cm]

Length (less ramps)

96″ [244 cm]

Length (with ramps)

203″ [516 cm]

Height (at roll/ramp deck)

20″ [51 cm]

Height (overall)

21″ [53 cm]


1,800 pounds [816 kg] (approximate uncrated − less ramps)

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.

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  

ATV tire stop

Optional bolt-on front-tire stop for ATVs

Extended tire stop/support

Optional bolt-on extra-long wheelbase kit ( range)

Self starting

Optional starter motor and drive kit


Optional integral (bolt on) trailer assembly with alloy wheels and DOT approved lighting, etc. (black powder coat)


Optional high-velocity blowers 1,000 or 1,600 CFM (120-volts @ 60-Hertz 1φ)

Model Number: #056-850-2K

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