• MECHANICAL LINKING AVAILABLE:Test traction-control 2WD and AWD vhehicles
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Manufacturing world's largest chassis-dynamometer line, in an affordable range of classes, targeted to your specific testing requirements.

“We help you plan ahead – to avoid buying the wrong class 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 chassis dyno.

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

    • Tuning 300+ Hp drag/street/rally cars? Get serious with larger-diameter Tuner Class rolls.

    • Developing high-speed hyper cars, or performing research work? Demand 36" (or larger) R&D 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 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 sports-car spoilers.


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 many sports cars to drop into, so that rules them out for most 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 performance automotive 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.

• Roll diameters: 8½", 13", or 20"

• 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

Tuner Class
Dynos → read more...

Tuner Class roll-diameter limitations:

Tire on 20 inch rolls. 20" dia. single rolls are well suited for mild-power (< 450 Hp) automotive 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 sports cars 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.

Tire on 24 inch rolls. 24" dia. single rolls are better suited for moderate-power (< 500 Hp) automotive testing. Like all "Tuner-Class" 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 car does not drop into a valley, lowered sports cars are much 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) automotive 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 sports cars are much 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", 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

R&D Class
Dynos → read more...

Tuner Class roll-diameter limitations:

Tire on 36 inch rolls. 36" dia. single rolls are well suited to very-high-power (< 750 Hp) automotive 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) automotive 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 sports cars are much 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) automotive 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 car does not drop into a valley, lowered sports cars 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.
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 production vehicles. No dedicated test bay, or digging up floors, required. Drive on, strap down, and test. Larger-diameter roll systems (24" - 60" diameter) handle sustained racecar speeds and power.

   → *Capacities are approximate, as they are primarily tire safety and traction limited – higher torque requires tie downs.
20-inch roll system is available with eddy-current absorber and/or AC motoring options. Installs in a pit or above ground – with optional four-post lift (as shown) or ramps.
More than flash-acceleration Hp is available from DYNOmite load-cell equipped eddy-current absorption systems. They permit indefinitely* running steady-state, RPM-step, or sweep-Hp tests – under computer control. Absorber loading is vital for ECU drivability mapping or emissions work. In comparison, inertia-only “dynos” can’t hold an RPM point, but calculate power from flywheel (roll) mass acceleration – like deriving Hp from drag-strip MPH.

   → See General Specifications or Models and Prices pages.
Our “multi-roll” mechanically-linked AWD dynamometer option allows hassle-free testing of FWD or RWD traction-controlled vehicles, as well as 4WD and AWD applications.
FWD/RWD or AWD (to ~740+ Hp*) chassis systems typically include: monocoque frame housing 8½", 13", or 20" medium-inertia rolls – with machined-in “traction grooves,” roll shield, drive-up-ramps and pit-plate plans, eddy-current absorber with load-cell and overdrive options, DYNOmite data-acquisition computer, AC supply, DYNO-MAX software, inductive RPM pickup, temperature sensor, and data harness. (Image of optional AWD upgrade, with 13" rolls, dual absorbers, and multi-roll wheelbase assembly, at left.)

   → Watch one customer's AWD video!
Adjustable wheelbase in-ground 44-inch AWD twin-roll dynos (with or without absorbers) handle 3,000+ Hp at 225 MPH. Mechanical (or optional electronic) roll synchronization.
R&D chassis systems (to ~2,000+ AWD Hp*) typically include: tube-steel frame housing 24", 30", 44", or 60" medium-inertia rolls – with machined-in “traction grooves,” deck plates, floor anchors, tie downs, eddy-current absorber(s) with load-cell and overdrive options, DYNOmite data-acquisition computer, AC supply, DYNO-MAX software, inductive RPM pickup, temperature sensor, and data harness. (Image of optional AWD upgrade, with 44" rolls, dual absorbers, and electrically-adjustable wheelbase assembly, at left.)

   → Watch this 44" chassis dyno video!
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.
Our chassis dynamometer assembly-line area, just before pre-shipping testing. We also accommodate production and servicing of private-label brands − with the capability to take your product line from raw material to decal application."
Simulate driving conditions with DYNO-MAX “Road Load Simulation” mode. It emulates vehicle inertia, air drag, rolling friction, road grade, etc. – adjusting the absorber’s load accordingly. Fix driveline problems that never show up in the garage, without costly field testing. ECU mapping and emission work requires repeatable loading, on an absorption dyno.

   → Click to digitally-integrated 5-gas Exhaust Measurement System.
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.

*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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