If you hit the track often and want to measure how you and the car are performing, this is the perfect tool. It measures everything below. It was used 4 times. Bought it for $530 ($499 + shipping). Selling for $300.00, including shipping.

I'll post pictures of the unit tomorrow. Also included is a 2GB SD card, instead of the weak sauce 64MB card that comes with it.

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Performance meter features (http://www.performancebox.co.uk/performance_meter.html)

*Speed kmh or mph
*Distance metres or feet
*4 acceleration ranges - 2 adjustable
*2 decel ranges - 2 adjustable
*4 distance ranges (1/4 mile etc)
*1 foot rollout option
*Peak g-force
*Top speed
*Average speed
*SD card logging

Lap timer features (http://www.performancebox.co.uk/lap.html)

Because PerformanceBox uses a fast GPS engine, it knows precisely where you are every 1/10th of a second. Using this information, it can compare your current position with a number of stored reference points and use this information to trigger a lap timer function.

Setting it up is very easy and only has to be done once. Just put PerformanceBox into setup mode, and drive over the point you wish to define as the start/finish line. This point is then converted into a line at 90 degrees to your direction of travel, and stored in the internal memory.

Up to 6 Splits can be defined in a similar manner, and you can freeze corner exit speeds by using the Speed@Split function, making it more than just a simple lap timer.

There is a 99 lap memory, with every lap and split recorded to the SD card for later analysis.

As usual with PerformanceBox there are a host of other features such as modes for slalom courses, a one-shot mode for Sprint circuits, different options for split times, and you can load and save all start / finish and split points to a file on the SD card.

No other lap timer combines all of these features in one easy to use and affordable unit.

Data Logging (http://www.performancebox.co.uk/data.html)

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 64Mbyte SD card (which gives up to 53 hours of logging) 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.

The data is then read into the PerformanceTools software, which is installed from the CD supplied. This software allows graphical analysis of acceleration, braking, cornering and lap times. You can overlay up to four files, and you get an accurate track map to compare your driving line between different laps. Make no mistake, this is not just token data-logging, this is the real deal!

Power Calculator (http://www.performancebox.co.uk/power.html)

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.