iAccel is a performance meter designed to test the acceleration and braking performance of your vehicle. In use it displays a series of gauges to monitor performance and a continual graph of selected parameters. When performing a test the results can be displayed on screen and are stored in a CSV file for easy export if further analysis is required.
In addition to brake testing, 0-30 and 0-60 mph acceleration tests are available together with their metric equivalents. Standing ¼ mile acceleration, standing 400 m, 0-80 mph, 0-120 km/h tests, Event Data Recorder (EDR) and Crash test modes are also available in this version. EDR mode records the previous 60 seconds of data when the Record button is pressed. iAccel also has a continual recording mode which simply records the data to a CSV file received while the device is operating. To avoid running of of space, continuous recording is limited to 5 minutes. Crash mode is similar to Continuous recording except that all the auto-levelling features are completely disabled.
A calibration check feature is also available in the this version so you can check the accuracy of the accelerometers.
To use the app, your device should be mounted securely in the vehicle with the long edge of the device perpendicular to the direction of travel. Drive to the area where the test is to be performed and start the app. This launches the test screen and automatically calibrates the device to the gradient at that location. The Reset button can also be used to recalibrate the device at any time and is best performed when the vehicle is stationary. This avoids any bumps in the road distorting the calibration. You can change the type of test you want to perform using the Select Test screen which can be accessed by pressing the Menu button.
For Brake and Acceleration tests press the Arm button when you are ready to begin the test and perform the test. You can press the Arm button at any time, even when the vehicle is in motion. The results will be displayed automatically once the test is complete and includes two seconds of data prior to the start of the test and a short time after the test has finished. The limits of the test are highlighted on the result graphs.
For Continuous and Crash mode tests, press the Start button to start recording and press the Stop button to stop. When in EDR mode iAccel will record the previous 60 seconds of data when you press the Record button. These test results are not displayed automatically but results can be displayed from the Files options accessed by pressing the Menu button.
Tapping the graph panel cycles the display between acceleration, speed, orientation, and rate of rotation.
For ease of use, double tapping the Speedometer duplicates the Start / Stop / Arm / Cancel button and double tapping the right-hand gauge duplicates the Reset button.
When in use the Auto-Level mode automatically compensates for changes in gradient to ensure a match between the GPS speed and the speed derived from the accelerometers. Two speedometer pointers are displayed to show the speeds, the orange coloured pointer shows GPS speed and the blue pointer the speed derived from the acceleration data.
The app uses a combination of GPS, accelerometer and other sensors and is only accurate when the device is operated correctly and all sensors are receiving suitable signals. Please note that continued use of GPS can dramatically decrease battery life.
This app is designed for use off-road and any performance testing should only be performed off the public road network. At all times you must comply with all traffic regulations applicable to your location. J Neades can accept no liability for any injury, loss or damage which may occur while using this app.