Specifications
Dyno Dynamics - 2WD 450DS Twin Retarder Chassis Dynamometer

Applicable Vehicles

•  Rear wheel drive

•  Front wheel drive

•  4WD/AWD cars, recreational vehicles (with selectable single axle drive)
•  Race cars

•  Sport utility vehicles

•  Light commercial vehicles
•  Motor Cycles* (with optional adapter)

Vehicle / axle weights
Maximum vehicle weight 4,500 kg (9,900 lb)
Maximum axle weight (per axle) 2,250 kg (4,450 lb)

Power, Tractive Effort, Torque and Speed (Note 3)
  Standard Aux Retarder/PAU*
Maximum power graphing 900 kW (1,200 HP) 1,800 kW (2,400 HP)
Max. tractive effort graphing 20,000 N (4,500 lb) 35,500 N (8,000 lb)
Max. roller torque graphing 2,250 Nm (1,650 ft lb) 3,900 Nm (2,900 ft lb)
Max. axle torque graphing (Note 1) 6,200 Nm (4,600 ft lb) 10,850 Nm (8,000 ft lb)
Max. engine torque graphing (Note 2) 2,100 Nm (1,500 ft lb) 3,650 Nm (2,700 ft lb)
Max. power steady speed 450 kW (600 HP) 900 kW (1,200 HP)
Max. tractive effort steady speed 13,800 N (3,100 lb) 27,600 N (6,200 lb)
Max. roller torque steady speed 1,500 Nm (1,100 ft lb) 3,000 Nm (2,200 ft lb) 
Max. axle torque steady speed (Note 1) 4,200 Nm (3,100 ft lb) 8,400 Nm (6,200 ft lb)
Max. engine torque steady speed (Note 2) 1,400 Nm (1,000 ft lb) 2,800 Nm (2,000 ft lb)
Max road speed 200 km/h (120 MPH) / 250 km/h (150 MPH)* 200 km/h (120 MPH) / 250 km/h (150 MPH)* 

Roller Chassis
Retardation and Loading   
Retarder/PAU type Magnetic eddy current retarder/PAU
Load/speed availability High load available at all speeds
Cooling fins per retarder/PAU 84
Rollers  
Drive roller traction surface High grip Dyno Dynamics unique square cut knurl
Drive rollers linked No - Fully Independent
Roller Diameter 217 mm (8.5")
Roller length 855 mm (33")
Track Maximum (Note 4). 2,180 mm (86")
Track Minimum (Note 5). 465 mm (18")
Roller rotation Bi-directional
Exit Brake Electromagnetic roller exit brake
Bearings Standard Aux Retarder/PAU* 
10  12 
Balance Rollers and retarder(s)/PAU(s) dynamically balanced
Traction Roller surface Dyno Dynamics unique square cut knurl
Low tyre temperature operation
Heavy duty traction control system*
Tie down points per bed 8
Traction control mount points 4
Axle download User adjustable (with straps or optional airbag)
Inertias  
Roller inertia and retarder (combined) Standard Aux Retarder/PAU* 
2.590 kgm2 (61.6 lbft2) 3.566 kgm2 (84.6 lbft2)
Bed equivalent inertia (typical) 219 kg (483 lb) 302 kg (665 lb)
   

Installation and Dimensions
Refer installation drawings for detailed dimensions

Mounting
Above ground In Pit
Single Retarder Length
3,005 mm (118.3") 2,910 mm (114.5")
Twin Single Retarder Length
3,542 mm (139.5") 3,430 mm (135")
Single Retarder Width 990 mm (39") 890 mm (35")
Twin Retarder Width 990 mm (39") 890 mm (35")
Single Retarder cover above ground 510 mm (20") 150 mm (6")
Twin Retarder cover above ground 510 mm (20") 150 mm (6")
Single Retarder roller surface above ground 340 mm (13.5") 40mm (1.5")
Twin Retarder roller surface above ground 340 mm (13.5") 40mm (1.5")

Dyno Dynamics DS computerized control system
Instrumentation  
Computer Custom turn-key computer system
Monitor* Country dependent - refer factory
Additional monitors* Additional monitors and remote displays available - refer factory
Command Module Touchscreen PDA (Bluetooth)
SnapShot button
Roller Brake button
Reset, Next Step button
Display: Desired Speed, Load, Ramp Rate, RPM, etc
Ramp: Up-Hold-Down switch
Fan over-ride control 
Cabinet* Range of heavy duty steel cabinets available - refer factory
Automatic fan control* On-Off-Auto. Controls 2 fans. Cool-down timer
Power loss calculator Calculates engine power / torque from wheel power

Measurement and Display
Power display resolution 0.1 kW (0.1 HP)
Tractive effort display resolution 10 N (1.0 lb)
Force measurement Precision electronic shear beam load cell
Interface Vac pressure boost*
Inlet air temperature
High speed Air:Fuel ratio/Lambda*
Thermo-couple inputs*
Auxiliary inputs*
Fan control
Tachometer Multiple inputs (refer to tachometer documentation)
Atmospheric Correction Screen Inlet air temperature
Ambient temperature
Barometric pressure
Relative humidity
Mechanical efficiency (Dyno  Dynamics ATMC2 only)
Resultant correction factor
Bar Screen  
Date, time Used to date and time stamp  reports
Customer name 35 characters
Test details "Poor economy, low power "etc.
Vehicle identification Vehicle registration, license,  race number etc
RPM:Road speed ratio Derived from ignition system, vehicle ECU, roller speed,  injector, optical pick-up
Power Analogue bar & digit: kW (HP) [0.1 kW (0.1 HP)  resolution]
Tractive Effort Analogue bar & digit. N (lb) [1 N ( 0.1 lb) resolution]
Speed Analogue bar & digit. km/h (MPH) [0.1 km/h (0.1 MPH)  resolution]
Inlet air temperature Degrees C (F) [0.1 resolution]
Fuel mixture* Petrol (gasoline), LPG  (propane), alcohol, diesel Air:Fuel ratio and Lambda [0.1 AFR/0.01 Lambda  resolution]
Manifold vacuum/boost* Metric and imperial units. Gauge & absolute reference
Engine RPM Ignition, ECU, roller, optical pick-up*
Engine torque Nm (ft lb) 
Range of user definable inputs Temp, volts, pressure drops, TPS, etc
Graph screen  
Road power kW (HP)
Road tractive effort N (lb)
Road speed km/h (MPH)
Engine power kW (HP)
Engine torque Nm (ft. lb) 
Engine speed RPM
Fuel mixture* Petrol (gasoline), LPG  (propane), alcohol, diesel Air:Fuel ratio and lambda [0.1 AFR/0.01 Lambda  resolution]
Vacuum / boost* Metric and imperial units. Atmospheric & absolute reference
Time Seconds
User defined inputs Up to 4
Coast-down correction Based on coast-down test
Drive-train loss Based on coast-down test, ShootOut specification loss
Auto Graph SnapShot Triggers SnapShots at user defined road speed or engine  speed  interval
Large Digits on graph screen  
Air:Fuel ratio Air:Fuel ratio or Lambda
Vacuum / boost* Metric and imperial units. Atmospheric & absolute reference
RPM Derived from ignition system, ECU, roller speed, optical  pick-up*
Graph Types Full screen: Diagnostic and performance graphs
High resolution
Step ramp (user definable step)
Step graph
Snap graph
SnapShot Screen  Data acquisition of values defined by user
User definable recording
Work performed
Work history  

Test Modes
Constant speed mode Dial in the desired speed 
Constant load mode Dial in the desired load
Ramp mode Ramp Up-Hold-Down. Dial in the desired acceleration

Cooling fans
Range of cooling fans depending on country of  installation

Cooling fan control*
Software Software: independent control of two fans (or other devices):
On-Off-Auto Programmable cool-down timers
Command Module Manual fan control over-ride

Electrical Supply - (Varies with country and region of installation, refer  factory)
Australia Dynamometer: 240 - 250V single phase 50 Hz
Fans: 240 - 250 V  single phase / 415V three phase 
Europe Dynamometer: 220 - 250V single phase 50 Hz 
USA Fixed installation: 220 - 250V two phase 60 Hz

Shipping weights and dimensions (Approximate) 
Dynamometer chassis crated single retarder
1,000 kg 1,100 mm x 910 mm x 3,130 mm
2,200 lb 43" x 36" x 123"
Dynamometer chassis crated twin retarder
1,400 kg 1,100 mm x 910mm x

3,660 mm
3,080 lb 43" x 36" x 144"
Standard cabinet and control system
285 kg 790 mm x 880 mm x 1,900 mm
630 lb 31" x 35" x 75"
Small cabinet and control system (computer monitor not included)
200 kg 790 mm x 880 mm x

1400 mm

440 lb 31" x 35" x 55"
* Denotes Optional 

Note 1: Assumes 600 mm (23.5") tyre diameter
 Note 2: Assumes max torque occurs @ 3,500 RPM
 Note 3: Assumes sufficient traction
 Note 4: Distance between outer roller ends
 Note 5: Distance between inner roller ends

 Due to Dyno Dynamics commitment to ongoing research and development, specifications may  change  without notice.