• 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!”

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Step #1, make personal contact! Phone: 603-226-3966 now.
Step #1, make personal contact! E-mail: sales@land-and-sea.com now.

The only dyno line that expands with your needs. Start today with one of our low-cost inertia-only models. Later mount an absorber, expand to AWD, increase data channels, upgrade software, etc. – without wasting your original investment. Excluding roll diameter (see below) most of your important feature decisions may be revisited, even 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...

Machined-in “traction grooves” provide more traction (but less heat buildup) than cosmetic diamond-knurled rolls – without requiring excessive (Hp-robbing) strap-down force. Dynamically balanced and machine traction-grooved rollers dramatically limit vibration and tire slip – in all roll sizes! So even low-profile garage-class systems (8-1/2" - 20" rolls) that can be used above ground with ramps, have grip to test many production vehicles. Caster equipped models roll it to a corner when not in use (just raise their anti-vibration leveling pads). No dedicated test bay, or digging up floors, required. Just drive it on, strap it down, hook up the tach (or use Smart Ratio™) and test. Larger-diameter roll systems (24" - 60" diameter) easily handle sustained higher speed testing at racecar power levels.

   → *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 acceleration Hp can be measured with DYNOmite eddy-current absorption systems and their strain-gauge-equipped torque transducers. Reading steady-state power requires an absorption dynamometer. Unlike “acceleration spurt” inertial testing, absorbers allow loading vehicles indefinitely.* They permit running RPM-step or sweep-Hp tests – under computer control via included Electronic Auto Load. Controlled loading is vital for the proper mapping of engine management systems and guess-free emissions work. In comparison, inertia “dynos” must calculate power by timing a vehicle's roll (“flywheel mass”) acceleration – like deriving Hp from drag-strip MPH. They cannot hold a MPH or RPM point, while displaying true measured torque and power.

   → 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: 8½", 13", or 20" medium-inertia dual-roller assembly – with machined-in “traction grooves,” removable roller shield, drive-up ramps, support pads, eddy-current absorber (with step-up drive) options, electronic torque transducer, DYNOmite data-acquisition computer, AC power supply, electronic auto-load control, DYNO-MAX software, inductive RPM pickup, engine-temperature thermistor, and full-function data harness. (See optional AWD upgrade, with dual eddy-current absorbers and multi-roll assembly – image at left, or an electrically adjustable wheelbase system – slide-image above.)

   → 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. High-end Pro chassis systems (to ~2,000+ AWD Hp*) typically include: a FWD/RWD (optional AWD upgrade shown below) tube-steel frame with 24", 30", 44", or 60"-diameter medium-inertia rolls – with machined-in “traction grooves,” bolt-on diamond-tread deck plating, floor anchors, vehicle tie downs, electronic torque transducer and water or eddy-current absorber(s) with step-up drive options, DYNOmite 28-channel data-acquisition computer, inductive RPM pickup, DYNO-MAX “Pro” software, printer, Windows-7®-equipped Dell™ laptop, mobile computer stand, electronic auto-load control, weather station, AFR module, 42" high-volume cooling fan, required absorber hoses, engine-temperature thermistor, and full-function data harness. (See optional AWD upgrade, with dual eddy-current absorbers and 44" multi-roll assembly – image at left.)

   → Watch this 44" chassis dyno video!

DYNO-MAX dynamometer control software screen. DYNO-MAX™ “Pro” Software creates a full vehicle dashboard on your PC or laptop. Features include: real-time trace graph display, adjustable-limit alarm warnings, pushbutton controls, user configurable analog and digital gauge ranges, color graphing, test-report database, instant playback, full inertia compensation, Smart Record™ trigger points, adjustable data dampening, multiple data import/export options, semi-automatic zeroing, voice alarms on all gauges, wireless remote Pocket DYNO-MAX™ control interface, drag strip Christmas-tree console, 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 Simulate driving conditions by letting DYNO-MAX and your PC take control. DYNO-MAX features a “Road Load Simulation” mode that emulates vehicle momentum, air drag, rolling friction, etc. Enter the vehicle’s weight and drag data and then allow the software to monitor MPH vs. applied Hp, as it adjusts the dynamometer’s road load accordingly. To the vehicle’s driveline and operator, the feel is like actually driving down the road. Fix driveline problems that might never show up in the garage, like shifting issues, driveshaft vibration, brake squeal, bearing noises, brake shudder, exhaust rattles, etc. – without costly field testing. Verify emissions under load with your existing, or our (optional) digitally integrated five-gas DYNOmite Exhaust Measurement System. Rapid on-off set-up makes it practical to skip those old time-consuming road trips. Emission testing requires repeatable loading, on an absorption dyno. Forget using unloaded idle data to verify if repairs are in compliance. Send customers for state inspections with confidence.

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