• TANDEM AND TRI-AXLE DYNOSIn-house manufacturing - custom systems available
TANDEM AND TRI-AXLE DYNOS1 2 3 4 5 6 7

Manufacturing world's largest chassis-dynamometer line, in an affordable range of classes, targeted to your specific industrial testing requirements.

“We help you plan ahead – to avoid buying the wrong class truck dynamometer!”

Step #1, make personal contact! Phone: 603-226-3966 now.
Step #1, make personal contact! E-mail: [email protected] now.

The only dyno line that expands with your needs. Start today with a low-cost inertia-only model. Later mount an absorber, expand to AWD, add channels, upgrade software, etc. – without wasting your original investment. Excluding roll diameter (see below) most feature decisions may be revisited – years later. We manufacturer all major components in house – saving you third-party markups of competitors.

One size does not fit all! The above paragraph notwithstanding, one unique specification will lock you in: roll diameter. It limits the usable traction/speed/power (class) of any truck chassis dyno.

    • Only doing speedometer/odometer calibration, or part-throttle OBD-II checks? Then tiny 8½" Garage Class roll diameters may be okay.

    • Tuning 300+ Hp industrial/drag/off-road/street trucks? Get serious with larger-diameter Dealer Class rolls.

    • Researching economy/emissions/etc. trucks, or for other developement work? Demand 36" (or larger) OEM Class diameters.

Call to let us help you do your homework on this roll-size topic, and others, or continue reviewing below:

Garage Class
Dynos → read more...

Garage Class roll-diameter limitations:

Tire on 8-1/2 inch rolls. 8½" dia. tandem rolls are suitable for very-low power (< 265 Hp) testing Please understand, tiny-diameter rollers were originally designed (in the 1930's) for general garage-bay repairs, certifying speedometers and taxi/ambulance odometers, then (in the 1980's) emissions inspections. However, 8½" to 10½"-diameter class rolls can be suitable for hobby-level performance tuning, if you stay below the honest power/speed levels of all-such tiny rolls. Warning: unethical companies have since exaggerated their small roll dyno's suitability, for serious performance testing, to absurd levels. Strapping does not change this limitation, as it increases (not decreases) the deformation. When the newbie dyno owner discovers their inevitable repeatability issues, they are stuck lying about accuracy to avoid ruining their investment – perpetuating the myth! Bottom line, if your primary usage will be performance tuning, buy rolls over 12" in diameter, with more-reasonable simulation inertia.

Tire on 13 inch rolls. 13" dia. tandem rolls are best suited for low power testing (< 370 Hp). Small-diameter rollers are a step up from the sub-12" diameter (very-low Hp) dynamometers that were the rage in the 1970s. They provide enough inertia and tire-contact patch to maintain traction and repeatability for performance tuning in that power range. They are also low-profile enough to allow easy drive-on ramp loading, even clearing many lowered trucks.


Tire on 20 inch rolls. 20" dia. single rolls are well suited for mild-power (< 450 Hp) truck testing. Because they do not pinch the tires between a tandem pair of drop-in rolls, the tire is only deformed in a single (larger) contact-patch location. Since the truck does not drop into a valley, lowered vehicles are much easier to accommodate. These 20"-diameter roll's medium inertia helps simulate real-world acceleration/deceleration – vital for part-throttle tuning. But the major reason for non-tandem rolls is improved repeatability, due to generally lower and more consistent parasitic losses.

• Roll diameters: 8½", 13", or 20" (single)

• Industry "claimed" flash Hp:* 850Hp, 1,200Hp, or 2,000Hp

• Repeatable power limits:* ~265Hp, ~370Hp, or ~450Hp

• Tire-deformation losses: worst, poor, or fair

• Inertial simulation: poor, fair, or okay

• Installation: pit or lift not required

Dealer Class
Dynos → read more...

Dealer Class roll-diameter limitations:

Tire on 20 inch rolls. 20" dia. tandem rolls are intended for low power truck testing (< 450 Hp). Note, tandem 20"-diameter rollers are too deep for some samll (lowered) trucks to drop into, so that rules them out for some performance-tuning shops. For trucks however, they provide enough inertia to troubleshoot some drivability issues, without abusing the tires, at least under moderate speeds. For shops doing both truck and car tuning, a single-roll setup, where the tire is not pinched between pairs of rolls or interfering with ground-effects aero, is a better solution.

Tire on 24 inch rolls. 24" dia. single rolls are better suited for moderate-power (< 500 Hp) truck testing. Like larger single rolls, they do not pinch the tires between tandem pairs of drop-in rolls, the tire is only deformed in a single (larger) contact-patch location. Since the truck does not drop into a valley, lowered trucks are easier to accommodate. These larger roll's greater inertia also better simulates real world acceleration/deceleration – vital for part-throttle tuning. But the major reason for non-tandem rolls is improved repeatability, due to generally lower and more consistent parasitic losses.

Tire on 30 inch rolls. 30" dia. single rolls are ideally suited for high-power (< 675 Hp) truck testing. Because they do not pinch the tires between a tandem pair of drop-in rolls, the tire is only deformed in a single (larger) contact-patch location. Since the car does not drop into a valley, lowered trucks are easier to accommodate. These larger roll's realistic inertia also best simulates real world acceleration/deceleration – vital for part-throttle tuning. But the major reason for non-tandem rolls is improved repeatability, due to generally lower and more consistent parasitic losses.

• Roll diameters: 20" (tandem), 24", or 30"

• Industry "claimed" flash Hp:* 1,200Hp, 2,400Hp, or 3,000Hp

• Repeatable power limits:* ~450Hp, ~500Hp, or < 675Hp

• Tire-deformation losses: fair, okay, or good

• Inertial simulation: okay, good, or ideal

• Installation: pit or lift suggested

OEM Class
Dynos → read more...

OEM Class roll-diameter limitations:

Tire on 36 inch rolls. 36" dia. single rolls are well suited to very-high-power (< 750 Hp) truck testing. These large roll's realistic inertia also best simulates real world acceleration/deceleration – vital for part-throttle tuning. However, the major reason for non-tandem rolls is the improved repeatability, due to lower (thus more consistent) parasitic losses.



Tire on 44 inch rolls. 44" dia. single rolls are better suited for super-power (< 825 Hp) truck testing. Because they do not pinch the tires between a tandem pair of drop-in rolls, the tire is only deformed in a single (super large) contact-patch location. Since the car does not drop into a valley, lowered trucks are easier to accommodate. These very large roll's realistic inertia also best simulates real world acceleration/deceleration – vital for part-throttle tuning. However, the major reason for non-tandem rolls is the improved repeatability, due to lower (thus more consistent) parasitic losses.

Tire on 60 inch rolls. 60" dia. single rolls are ideally suited for ultra-power (< 1000 Hp) truck testing, or advanced research where tire-to-roll drag must be absolutely minimized. Because they do not pinch the tires between a tandem pair of drop-in rolls, the tire is only deformed in a single (near flat) contact-patch location. Since the truck does not drop into a valley, lowered trucks are much easier to accommodate. These super-large roll's realistic inertia also best simulates real world acceleration/deceleration – vital for part-throttle tuning. However, the major reason for non-tandem rolls is the improved repeatability, due to lower (thus more consistent) parasitic losses.

• Roll diameters: 36", 44", or 60"

• Industry "claimed" flash Hp:* 3,600Hp, 4,400Hp, or 6,000Hp

• Repeatable  power limits:* ~750Hp, ~825Hp, or ~1,000Hp

• Tire-deformation losses: very-good, better, or best

• Inertial simulation:  ideal in all diameters

• Installation: pit or lift required

 

  • 2600 SERIES 13'' AWD:13'' roll diameter (Garage Class) - mechancialy linked - avaiable as inertia only, eddy-current (1, 2, or 3), or AC (motoring) - multi-roll low-profile monocoque welded-steel frame

Related Tech-Talk Topics:

DYNOmite-Pro AWD Chassis-Dynamometer product overview. Note: Generic model – may include non-standard options.
Sample chassis-dynamometer bay layout. Stick man confused about path to take.

More Tech-Talk Articles...

 

Stick-figure cranking money-making machine.
Financing is available to let you start making money from your investment, before making a payment! Our equipment financing options allow you to generate revenue – with low monthly payments, that are 100% tax deductible to the IRS. Better yet, these financing options avoid restrictive bank ratio calculations and keep any bank lines of credit your business has – open.

   → Click for Equipment Financing.
8½" rolls require 3½" of vertical “strap-down” (tire deformation) to wrap around the equivalent (flat-earth) contact of a 44"-diameter roll. Under high torque, only the unlinked forward roll offers support. This FEA image’s red zones show where excessive deflection is causing power loss and hidden tire damage!
Larger diameter rolls are safer! Excessive strap-down forces, especially when combined with too-small roll diameters, can cause hidden tire damage. The FEA (Finite Element Analysis) images (at left) compare large-diameter and small-diameter rolls, under equivalent contact patch conditions. Those red hot-spots highlight the hidden cord overloading that occurs running smaller rolls under high loads. Note how thrust climbs the tires up onto the forward roll (of a tandem-roll pair). No wonder tire manufactures disclaim liability and warranty responsibility for tires abused on small rollers. Larger-diameter rolls better replicate the flat-earth that tires are actually designed to run on.
Machined-in “traction grooves” provide more traction (but less
Dynamically balanced and machine traction-grooved rollers dramatically limit vibration and tire slip – in all roll sizes! Even low-profile above-ground garage-class systems (8-1/2" - 20" rolls) using casters and/or ramps, have grip to test many light trucks. No dedicated test bay, or digging up floors, required. Drive on, strap down, and test. Larger-diameter roll systems (24" - 60" diameter) handle sustained highway speeds and power.

   → *Capacities are approximate, as they are primarily tire safety and traction limited – higher torque requires tie downs.
We manufacture single-axle, dual-axle, and even AWD tri-axle dynos – with adjustable or multi-roll wheelbase accommodations and electronic or mechanical linking.
Front, Rear, Multi-Axle, and All Wheel Drive trucks can be tested on the appropriate model DYNOmite truck chassis dyno. Many allow front/rear torque-bias monitoring and support bidirectional mounting. Both electronically and mechanically coupled systems are available. We can even convert many other manufacturers’ older, single-axle chassis dynamometers to include AWD capability, with full Electronic Axle Synchronization, at a fraction of the cost of a new installation!
4½" – 60" rolls (cutaway shows super-duty truck “dually” 30" with one eddy-current absorber) have machined-in “traction grooves” to handle big low-end torque or race speeds and Hp.
Overdriven absorption units – handle low-rpm truck torque loads* that competitor’s light-duty 1:1 drives cannot match. Our high-capacity absorbers allow steady-state testing and servicing trucks in the same road-speed ranges that owners really operate them at. (*Capacities are approximate, as they are primarily tire safety and traction limited – higher torque requires adequate vehicle restraints.)
Tandem-axle dyno for large highway trucks. Heavy-duty pit-mounted assembly features up to four eddy-current absorbers. Above ground (including the drive-up ramps) and tri-axle configurations are also available.
Basic 1,350+ Hp* truck chassis kit includes: heavy-duty tube-steel frame and 30"-diameter “dually” wide-roll assembly – with machined-in “traction grooves,” air brakes, roll shield, floor anchors, wheel chocks, tie downs, eddy-current absorber(s) with load-cell and overdrive options, DYNOmite-Pro data-acquisition computer, AC supply, DYNO-MAX software, data harness, temperature sensor, and more. (Upgradeable to dual absorbers and AWD – at any time.)

   → See General Specifications or Models and Prices pages.
“Earth-Mover” tri-axle dyno for 120,000 pound off-road vehicles. Super-duty pit-mounted AWD assembly features up to six eddy-current absorbers. Above-ground (cradle-mount or dual-axle) configurations (suitable for on-road trucks) are available.
1,000 to 4,000+ Hp* Pro chassis kits include: a FWD/RWD (optional AWD upgrade shown below) tube-steel frame featuring multiple 20", 24", 30", 44", or 60"-diameter high (or medium) inertia rolls – with machined-in “traction grooves,” deck plates, floor anchors, wheel chocks, vehicle tie downs, eddy-current absorber(s) with load-cell and overdrive options, DYNOmite data-acquisition computer, AC supply, DYNO-MAX “Pro” software, printer, Windows 10®-equipped Dell™ laptop, computer stand, weather station, cooling fan, temperature sensor, and data harness.

   → See General Specifications or Models and Prices pages.
Stick-figure repairman, with tire and toolbox.
Fix driveline problems that never seem to show up in the garage, like shifting issues, driveshaft vibration, brake squeal, bearing noises, brake shudder, exhaust rattles, etc. – without the added liability and cost of field testing. Just drive it on, strap it down, hook up the tach (or use Smart Ratio™) and test – a full report prints out automatically.
Mechanically linked heavy-duty (20”roll) AWD systems for multi-axle trucks. Available in a wide combinations of absorber capacity, roll count, and wheelbase range.
Verify fuel economy and emissions under load using your existing, or our optional (digitally integrated) DYNOmite five-gas Exhaust Emissions System or DYNOmite Smoke Opacity Meter. Proper emission testing procedures require repeatable absorber load control, impossible on simple inertia dynos. No more trying to use unloaded idle data to verify that a truck is in tune and emissions compliance. Send customers for state inspections with confidence.
DYNOmite eddy-current power supply and control module – with auto and manual modes. It supports all DYNOmite servo-control functions.
Measuring power under a controlled RPM load is simply vital for proper mapping of engine management systems and guess-free emissions work. This requires a high-capacity absorber. Inertia-only dynos are unsuitable for this type of work, as such units cannot maintain a loaded MPH or RPM setting. An absorber allows running controlled RPM step or sweep Hp tests, so everything is under computer control – via the included Electronic Auto Load.

   → MAX-narrated animated look at: How Eddy-Current Absorbers Work
DYNO-MAX dynamometer control software screen.
DYNO-MAX™ “Pro” Software creates a full console on your PC. Features include: real-time trace-graph display, adjustable-limit alarms, pushbutton controls, user-configurable analog and digital gauges, customizable graphing, formula editor, test database, instant playback, inertia compensation, Smart Record™, adjustable dampening, import/export options, automatic zeroing, voice warnings, dragstrip Xmas-tree console, free iPhone control app, etc.

   → Click for full list of DYNO-MAX features.
DYNOmite data acquisitio electronic circuit-board set.
DYNOmite data-acquisition computer displays and records true Hp, torque, RPM, elapsed time, etc. at up to 1,000 readings per second (per channel). It even applies SAE correction factors for temperature, barometric pressure, and humidity – a full report prints out automatically! Electronic load and throttle control options – just push buttons to select the test RPM or sweep rate and the DYNOmite’s advanced PID algorithm runs the show – hands free.

   → Click for full list of DAQ features.
DYNO-mite Dynamometer support technican.
Live-person technical phone support provides a significant advantage over other companies’ obnoxious voice-mail runarounds. Also, our hardware’s lifetime phone and e-mail support, plus access to the special DYNOmite owners 24/7 web support area, are all FREE!

   → See DYNOmite Support Access page for more details.

*Approximate; limited primarily by tire safety and traction - higher torque transfer requires tie downs. Continuous capacities depend on selected absorber and test speed. Air-cooled absorber loads are rotor temperature dependent. Water brake power capacities are RPM dependent and assume a minimum water supply of 1 gpm @ 30 to 60 psi for every 20 continuous Hp. Call Land & Sea, Inc. at (603) 226-3966 for the approximate capacity of any specific test configuration.

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