I use a Performance Box by Racelogic (same company that makes VBOX). It is an external device that mounts to the windscreen via suction cups. Me and a buddy split the cost of the unit and use it to log our times when we do track events.
You can use it for the acceleration tests like RICE does, but I have yet to log one myself.
http://www.performancebox.co.uk/
One of my logs:
