At OnTrack Digital we make affordable Motor Racing and Dyno software which allows racers to perform their own accurate dyno testing without the need for expensive dyno equipment. Our dyno software can be used in 2 ways. 1) At the race track for vehicle acceleration dyno runs. No need for dyno hardware, just accelerate your vehicle, or 2) With an inertia flywheel dyno in your race shop or at home.
Dyno software for vehicle acceleration dyno runs at the race track
Vehicle acceleration type dyno runs use the same principle as a fixed inertia dyno. Instead of accelerating a heavy inertia flywheel or rollers, the engine is dyno tested by accelerating the total weight of the vehicle. To measure the vehicle acceleration OnTrack can use data signals from either the vehicle speed or engine rpm. For example you can use an OnTrack Ignition Sensor that clips onto a spark plug lead to pickup engine rpm, or use an OnTrack Speed Sensor triggered by a magnet to pickup vehicle speed, or use any of the speed or rpm signals from the vehicles electronics.
An acceleration dyno run is made using a laptop computer or data recorder as follows:
Plug a signal lead into your laptop or data recorder
Start the OnTrack software
Enter the Total Vehicle Weight, including driver/rider
Enter the weather conditions (Temp/Humidity/Barometric Pressure)
Start the engine and select second gear on a straight section of track
Accelerate the vehicle from low rpm through to red-line
OnTrack will calculate and graph HP and Torque for the run
The dyno results and data are stored in the OnTrack database
You can graph and compare up to 6 runs on the same dyno chart
Dyno software for inertia dynos at home or in the race shop
The OnTrack dyno software can be used for any type of inertia dyno where the engine accelerates a mass such as a flywheel or heavy rollers. Many customers use OnTrack for their "home built" inertia dyno projects where they build a dyno frame with an engine driven flywheel or rollers and use the software with an OnTrack Speed Sensor triggered by a magnet on the flywheel/rollers. The speed sensor, and associated signal filter, plugs directly into a PC or laptop sound card port with no other hardware required. This setup provides great dyno results at an affordable price.
Data sensors and data signals
The OnTrack dyno software can use any signal from a sensor or data source that has a frequency related to the speed of the flywheel/vehicle or engine rpm. Examples of these are:
OnTrack Speed Sensor triggered by a magnet (recommended for inertia dynos)
OnTrack Inductive Ignition Sensor (clips onto a spark plug or ignition lead)
Engine rpm signal from the ignition system or ECU
Vehicle Speed signal from the vehicle speed sensor or ECU
Signal to a vehicle's digital tacho or digital speedo
DIY sensor using a trigger or optical "chopper"
Note: Only one of these signals, speed or rpm, is required. The other is calculated by the software. For example, if you use a speed signal then the engine rpm is calculated using the transmission ratio.
The OnTrack software can use the signals from any of these sources, along with info in the OnTrack database, to calculate the vehicle or flywheel acceleration and the engine rpm through the rev range. Given the total weight of the vehicle or Moment Of Inertia of the flywheel, and the weather conditions at the time of the dyno run, then OnTrack calculates and graphs very accurate dyno charts.