Mount a cheap Android tablet (e.g., Nexus 7 2013) using Torque 1.5.58. Use the "Track Recorder" plugin to overlay RPM, speed, gear, and lap times onto video from your phone’s camera.
"The 1.5.58 update came from a simple frustration: our own test drivers couldn't feel the difference between a cold tire on lap one vs a hot tire on lap ten, because our model was just a linear multiplier. The 3-node thermal model was three months of R&D, but the result – subtle graining, peak slip drift, even blistering – finally matches real telemetry from our partner racing team." — , Lead Physics Engineer torque 1.5.58
: Record 0-60 mph timings and quarter-mile speeds using a combination of GPS and OBD data. Mount a cheap Android tablet (e