Overview
Low-cost 1,700* 4WD eddy-current unit includes: two monocoque steel frames and low-profile 8.5″-diameter linked low-inertia multi-roll (multiple front/rear wheelbases) assemblies – with machined-in “traction grooves,” CNC turned and balanced rolls, roll shield, drive-up-ramps and pit/deck-plate plans, eddy-current absorber and controller, mechanical AWD-axle synchronization, S-beam load cell, DYNOmite-Lite+S data-acquisition computer, DYNO-MAX “Lite” software, auto-load control, 3-channel (+ servo) data harness, banner, accessories package, and manual (less PC). (Upgradeable to dual eddy-current absorbers – at any time.)
Specs
| 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) |
|
Approvals |
CE and/or UL approved (per locale) |
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Board type and channel capacity |
Lite+S, PC linked − 3 channel+S |
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Expansion capacity upgrades |
Optional 28, 56, or 112+ channel capable subsystem |
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Data rate |
User-selectable rates up to 200 (1,000 optional) recordings per second (per channel) |
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Transducer wiring interface |
Quick-disconnect data harnesses − 3-channel+Servo |
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Calibration |
Non-volatile setup memory |
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Atmospheric correction rate |
Standard, SAE, DIN, JIS, ECE, J1995, Custom |
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Gear-ratio RPM and shifting compensation |
Smart Ratio™ automatic ratio calculation with multiple, simultaneous, RPM inputs |
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Recording features |
Smart Record™ automated recorder triggering |
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Data interface |
User selectable, USB or RS-232 serial port, output to a PC − via DYNO-MAX software option |
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Third-party data-output interface options |
Free Windows driver for National Instrument’s Lab View™ available |
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Temperature sensor |
0 to 255 Fahrenheit [-18 to 124 Celsius] thermistor (optional) |
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Standard and optional sensor inputs |
RPM, speed, torque, frequency, flow, thermocouples, thermistors, 0-5 volts, Lambda, position, etc. |
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Standard and optional control outputs |
Ignition shut-off, relay control, load-control stepper output, 0-5 volt D/A, etc. |
| Torque Transducer | |
|
Configuration |
Environmentally sealed S-beam load cell |
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Maximum displayed torque |
Unlimited ft-lbs [N-m] − real-time and playback |
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Load-cell range |
Dual 0 to 1,000 pounds [0 to 454 Kg] (other ranges available) |
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Load-cell signal-output gain |
3 millivolts/volt |
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Load-cell resolution |
Better than 0.02% of full-scale accuracy − typical |
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Strain gauges |
Linearized full-bridge strain gauges in balanced Wheatstone bridge |
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Advanced linearization (software) |
User-configurable edit table (interpolated deviation map) |
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System torque resolution |
Better than 0.2% of full-scale accuracy − typical |
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Calibration features |
Semi-automatic calibration of zero offset |
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Drift stabilization |
Ratiometric supply-voltage and temperature compensation |
| Roller Frame | |
|
Configuration |
Multiple sets of tandem (linked) tiny-diameter 8½” [21 cm] (nominal) rolls |
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Mechanical frame construction |
Fully-welded monocoque steel frames, anchoring points, greaseable bearings (pit-plates optional) |
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Track width (max / min) |
87″ [221 cm] maximum, 28″ [71 cm] minimum (with deck plate in place) |
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Wheelbase |
94″ – 135″ [239 cm – 343 cm] range − multi-roll accommodates range of wheelbases |
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Absorber coupling |
Inline 1:1 ratio |
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Installation |
Above ground with integral anchoring points (pit-mounting optional) |
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Ramps |
Optional dual heavy-duty, lightweight-aluminum, ramps |
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Pneumatic requirements |
90 PSI [600 kPa] @ 3 CFM [5 meter^3/hr] (for air-brakes and lift-bar options only) |
| Axle Weight Capacities | |
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Maximum dynamic load |
8,000 pounds [3,629 kg] (per axle) |
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Maximum static load |
8,000 pounds [3,629 kg] (per axle) |
| Rolls | |
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Effective inertia range |
Low inertia (to allow absorber simulations) |
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Minimum simulated vehicle mass |
2,200 pounds [1,000 kg] typical (excluding absorption simulation) |
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Minimum balance tolerance |
G2.5 via internal, multi-plane, dynamic spin balancing |
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Steel-roll construction |
Monocoque with 360-degree welded end plates and 100% machine-finished thru-shafting |
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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)* | |
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Industry’s claimed roll-power range* |
1,700 Hp [1,268 KW] |
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Industry’s claimed engine-power range* |
2,125 Hp [1,585 KW] |
|
Notice |
*Power capacity is unlimited, but subject to roll diameter-induced tire deformation (safety) and traction (efficiency) limits. |
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Rolling-road’s diameter at tire contact-patch |
~8½” [~21 cm] (see tire manufacturer’s “dyno tire vs. roll-diameter safety guide”) |
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Tire deformation (due to roll’s diameter) |
3¾” [96 mm] tire indentation (approximate) required for 5″ contact-patch length on typical automotive tire |
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Maximum displayed power |
Unlimited Hp [Kw] − real-time |
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Maximum inertial power (traction limited) |
Unlimited Hp [Kw] (but subject to roll diameter’s tire deformation and traction limits) |
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Maximum tractive force (traction limited) |
Unlimited lbs-force [kN] (but subject to roll diameter’s tire deformation and traction limits) |
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Typical inertial power range (traction limited) |
16 to 1,060+ Hp (1000 / 3.8″deform*μ*2wd) [12 to 800+ KW] limit @ μ = 1.0 |
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Peak steady-state power |
500+ Hp [373+ KW] initial − cold absorber rating (see absorber’s load chart) |
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Typical steady-state power range / time |
8 to 200+ Hp [6 to 150+ KW] extended − warm absorber rating (see absorber’s load chart) |
| Engine (and Absorber) Tachometers | |
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Range |
0 – 32,000+ RPM real-time display (user reconfigurable) |
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Timing reference |
Quartz-crystal calibrated |
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Resolution |
1.0 RPM (typical) |
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Primary RPM signal |
Supports direct connection to most standard vehicle tachometer sources |
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Signal compatibility |
User adjustable trigger voltages − pulse type selectable from ½ to 12 PPR |
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Alternate signal sources |
“Clamp-on” inductive (spark plug, injector, or coil) wire pickup (included) |
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Analog tachometer options |
Optional “cigarette lighter” and optical RPM pickups |
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Digital tachometer options |
Optional OBD-II tachometer interface |
| Dyno Speedometer | |
|
Range |
0.0 – 255.0 MPH [0.0 – 410.0 km/h] − real-time digital (user reconfigurable) |
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Timing reference |
Quartz-crystal calibrated |
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Resolution |
Better than 0.1 roll RPM (typical) |
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Standard signal source |
Hall-effect pulse type for RPM/MPH pickup (standard) |
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Signal compatibility |
User adjustable trigger voltages − pulse type selectable from 1 to 360 PPR standard |
| Speed Range (tire deformation limited) | |
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Rolling-road’s tire contact-patch diameter |
~8½” [~21 cm] (see tire manufacturer’s “dyno tire vs. roll-diameter safety guide“) |
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Roll RPM vs. vehicle speed factor |
39.2 RPM per MPH [24.4 RPM per km/h] |
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Digital speed range |
0 – 255 MPH [0 – 410 km/h] real-time display (user reconfigurable) |
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Safe speed range (tire deformation limited) |
5 – 95 MPH (186sr / 3.8″^.5deform) [8 – 153 km/h] (subject to roll diameter’s tire-deformation limits) |
| Load Control (absorption units only) | |
|
Absorber coupling |
Inline 1:1 ratio |
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Absorber speed / RPM regulation |
Electronic auto-load control (closed-loop PID) − with full road-load simulation |
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Absorption method |
Electric air-cooled eddy-current absorber with pulse-width-modulated DC controller |
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Automated braking |
Yes − Smart Braking™ (via DYNO-MAX) |
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Bidirectional capable |
Yes |
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Front-to-rear axle-speed synchronization |
Yes − mechanical AWD-axle synchronization |
|
Power requirements (for absorber) |
20-amps @ 240-volts AC @ 60-Hertz [or 20-amps @ 240-volts @ 50-Hertz] |
| Approximate Dimensions and Weight | (Do not cast any pits, etc. until system is on site) |
|
Roller assembly |
Dual sets of tandem (linked) quad-roll ~13″ [~33 cm] multi-bearing frames − eddy absorbers |
|
Width |
120″ [305 cm] |
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Length (less ramps) |
169″ [86 cm] |
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Length (with optional ramps) |
298″ [414 cm] |
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Height (at roll/ramp deck) |
13¼” [34 cm] |
|
Height (overall) |
20″ [51 cm] |
|
Weight |
5,900 pounds [2,676 kg] (approximate uncrated − less ramps) |
| Dynamometer Control Software | |
|
Features |
Too many to list here − review DYNO-MAX specification pages and demo CD download |
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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 | |
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Computer housing |
Optional enclosed (EMI/RFI resistant) rolling PC cabinet |
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Monitor |
Optional “Pro” console with genuine Intel-equipped Dell PC and 17″ LCD display |
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Wireless remote operation |
Pocket DYNO-MAX™ − wireless Windows Mobile™ PDA control software (included in DYNO-MAX “Pro“) |
| Data Collection Options | |
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Air/fuel ratio monitoring |
Optional 9-19 range AFR exhaust-gas module with portable vacuum pump and tailpipe “sniffer” |
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Dynamometer control software |
Optional DYNO-MAX software packages (see separate specifications page and demo CD) |
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Electronic throttle control |
Optional unit allows PC to throttle road and track driving simulations (dead man or console mount designs) |
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Exhaust-emissions analyzer |
Optional five-gas analyzer (O2, CO, CO2, HC’s, and NOX) via digital DYNO-MAX RS-232 link. |
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OBD-II link |
Optional OBD-II (wired and wireless) interfaces for RPM, MPH, TPI, etc. |
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Temperature monitoring |
Optional oil-temperature “dip stick” thermocouples |
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Weather station module |
Optional weather station provides automatic entry of air temperature, barometric pressure, and relative humidity. |
| Other Options | |
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Above-ground vehicle hoist |
Optional four-post, adjustable track width, lift − with hydraulic power, control module, and safety air locks |
|
Ventilation |
Optional 42″ 13,300 CFM (120-volts @ 60-Hertz 1φ) test-bay cooling fan |
