The On-Board Dyno determines Horsepower based on the continuous measurement of Acceleration, Speed and the values of vehicle Weight and Drag. For a detailed understanding of the On-Board Dyno, please read: Theory.
The Acceleration is determined by a precision force/balance servo Accelerometer. This type of accelerometer is commonly found in military and aerospace applications that require extreme accuracy. It is this high degree of accuracy that allows the On-Board Dyno to make precision measurements.
The On-Board Dyno speed is determined
by a Vehicle Speed Sensor (VSS). The type of speed sensor will
depend on the speedometer system of the vehicle. In many cases, the On-Board Dyno
will be able to use the Vehicle Speed Sensor
that already exists in most late model vehicles. Dynolab can supply an
appropriate Vehicle Speed Sensor for older vehicles and racecars.
normal modes of operation of the On-Board
Horsepower, Acceleration, and Speed. The values of either Gross or Net Horsepower may be measured in the Horsepower mode. While in the Acceleration mode, the values of
Acceleration or Deceleration may be determined. The Speed mode permits the accurate measurement of vehicular speed.
measured in the Horsepower mode. While in the Acceleration mode, the values of Acceleration or Deceleration may be determined. The Speed mode permits the accurate measurement of vehicular speed. TheOn-Board Dyno may also be operated in the special mode of Vehicular Calibration. This mode is used to calibrate the On-Board Dyno to the vehicle. While is this mode, the values of Frictional and Aerodynamic drag and other vehicular
If the vehicle is allowed to coast in neutral, the indication will be zero. When the brakes are applied, a negative value will be indicated and it will represent the power dissipated by the brakes. If the vehicle is allowed to coast in gear, a negative value will be displayed and it will be that of the frictional Horsepower losses of the engine and drive train.
ReadoutThe On-Board Dyno measurements are continuously displayed in Real-Time by analog and digital readouts. No calculations are required and there is no need to stop the vehicle to review measurements. The analog meter provides fast response for racing conditions and is an excellent indicator of when to shift gears. The full-scale range of the analog meter scale will depend on the model of On-Board Dyno. Full-scale ranges are available from 150 to 2000 Horsepower.
The digital readout reads from 0 to 1999 on all models and provides high resolution for precision measurements. It also displays the calibration values. In addition to the continuous Real-Time readout, the peak values of Horsepower, Acceleration, and Speed are stored in memory and may be displayed at any time. The values of Aerodynamic and Frictional Drag may also displayed while in the calibration mode.
the digital display will indicate positive or negative values, the analog meter
in the Horsepower or Acceleration modes, pressing the + or - buttons will cause the digital display to indicate the positive or negative peak values of
the selected mode. When in the Speed mode, the peak value may be read by pressing the +
button. All peak values may be cleared to zero by simultaneously pressing the + and -
buttons or by turning the instrument off.
Vehicular Calibration mode is entered by simultaneously pressing the Select, +