For drivers keen to improve their laptimes and get valuable feedback on technique, PerformanceBox includes a sophisticated, fully functioning Data-logging package. Dedicated data-loggers with similar features normally cost more than the PerformanceBox itself, so the inclusion of this feature is worth the purchase price alone!

To use the Data-logging, simply insert the SD card and drive. Once you have finished the test, either plug the PerformanceBox into a PC via the USB cable provided, or remove the SD card and place it in a suitable reader.

PerformanceBox can help you to measure the power developed by your car’s engine, either at the wheels or flywheel. Having set the vehicle weight, results are calculated from the measurements taken by the fast GPS engine to give you useful guidelines to the car’s brake horsepower or kilowatt output.

Because these calculations are made from the GPS data rather than accelerometers, your results are likely to be more consistent and accurate.

• Results in BHP or KW
• Measures acceleration to give instant power output at the wheels
• Losses runs are used to calculate power output at the flywheel
• Runs can be carried out in second gear at relatively low speeds
• An effective tool for those wishing to evaluate tuning modifications

There are two parts to the testing process: the acceleration run, which gives you the power at the wheels minus the losses caused by tyre and air resistance. The second part of the test measures these losses and also estimates gearbox losses. The Power Mode is also an additional tool for car tuning, where access to a chassis dynamometer is not possible.