Dragy GPS Acceleration Datalogger

Dragy Datalogger

I’m getting a little ahead of myself by purchasing this gadget before I have the car.

Dragy Datalogger
Dragy Datalogger

I’m always on the lookout for a gadget that will help with measuring the vehicle performance and for some time I have been debating between the Gtech and VBOX but had not pulled the trigger on account of the price of those two devices.

Burger Motorsport offered the Dragy unit with an introductory price of $149 which was low enough to compel me to give it a try.

The device comes with a USB cable for charging and two thin metal plate with adhesive on one side that can be attached to a surface such as the dash so the magnets inside the Dragy housing will hold it in place.

The Dragy box is very light so I just set it on the dash and it did not move around much during normal driving.  Some velcro would also do the job since the devices weighs so little.

I’m still figuring out how best to use the device but it was pretty straight forward to make a recording.

Some shortcomings of this device:

  • Compared to the VBOX Sport that uses a 20 Hz receiver this device uses a 10 Hz receiver.  One sample per tenth of a second means the raw data is not very precise, for example at a drag strip if the strip reports a time of 13.54 this device will measure either 13.5 or 13.6 and then an algorithm will calculate the time to hundredths of a second based on the vehicles acceleration curve.  A rep from Dragy stated the receiver supports up to 18 Hz and that in the future it may be possible to use the app to increase the sampling rate.
  • It has no feature to calculate Horsepower.  The Dragy representative felt the calculation would be inaccurate so the ability to estimate Horsepower was left out.
  • Logging straight line acceleration and deceleration only.  It is not a lap timer though that is a capability that the Dragy representative said they may incorporate into a future app.
  • It does not seem to retain custom speed ranges.  For example I want to record 30-50mph and 50-70mph times but after setting those ranges if I close the app down and then open it back up those speeds ranges are no longer in the app.