The most difficult part would be writing to an SD card but I concurred that last winter with a digitizer project. This reads 2 encoders to log points in X/Y coordinates to replicate a part in a cad file.

I think a box which could log data on a car while you drive would be very beneficial.
An easy place to start is with an Arduino. Google it. I got to run right now but send me a PM and I'll send you my email.
Gary