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Frequently Asked Questions

What is the maximum g-force/speed that can be measured? The SPEEDBOX20 is fitted with a 2g accelerometer as standard, but a 6g option is available. The maximum measurable speed is approximately 1000mph.

How often do you get GPS speed updates? The GPS system calculates speed every 50ms (20 Hz), however this data is combined with the data from the accelerometers to calculate speed 200 times every second with very high accuracy.

How often do you get GPS position updates? The GPS system calculates position every 50ms (20Hz).

How accurately is speed measured? With average GPS reception, speed accuracy of the SPEEDBOX20 is about 0.05kph (or 0.1% if greater) when travelling at fairly constant speed or during moderate acceleration and braking, and about 0.1kph (or 0.1% if greater) during hard acceleration or braking. The only exception is at very low speeds (under 10kph) where the error increases to about 0.5kph. Do not be fooled by exaggerated claims from other manufacturers… this is as good as it gets. In contrast, a standard wheel speed pickup is only accurate to about 4% at constant speeds, and under hard acceleration or braking the error increases up to around 20%.

How accurately is position measured? With reasonable GPS reception, positional accuracy is about 3m (CEP). With ideal GPS reception this improves to around 1m.

What happens to the data if you drive under a bridge/tunnel/trees etc? Because speed is calculated from both the GPS data and accelerometers, even if the GPS data 'disappears' for a number of seconds, you won't be detect any degradation in the quality of the output data. Only if GPS data disappears for an extended time (10+ seconds) will the data start to degrade noticeably due to the slow drift which is inherent in integrated accelerometer calculations. However, if there is a significant gradient change during the GPS outage (for instance a tunnel with a down slope and then up slope) then the speed will be in error, since the accelerometers cannot distinguish change in gradient from acceleration or deceleration.

Where can I buy it? Check for an up-to-date list of stockists and online purchasing

Is it upgradeable? The SPEEDBOX20 is upgradeable in a number of ways; please check for an up-to-date list of options. Software and firmware updates, including new features, are freely available as we introduce them.

Is it easy to use? The SPEEDBOX20 is very simple to install, connect and configure. Full instructions are provided with every unit. With power supply or battery pack connected, the unit automatically starts up and commences measuring and outputting data continuously - no triggering is required. We have also kept the analysis software as simple as possible whilst making it as flexible as we can to ensure that you can do what you need to with it. As with all computer programs, the first time you use it there is a lot to take in - after you've become familiar with it, you will be able to analyse data quickly and efficiently.

What specification of computer is required? As with most programs, the analysis software will run on just about any PC with Microsoft Windows 95 or later - however, the faster the PC, the faster the program will run.

Is the SPEEDBOX20 reliable and well made? The SPEEDBOX20 is absolutely class leading in terms or component quality, build quality and reliability - this is a very high quality professional instrument, entirely designed in-house at Race Technology and manufactured in England. The unit carries the normal 12 month guarantee against manufacturing defects and lifetime email support.

Page last modified on January 26, 2010, at 10:39 AM