HOW-TO
How to measure 0-100 km/h (or 0-60 mph) with your phone
A step-by-step guide to timing your car's acceleration with an iPhone: mounting, staging, launching, and reading the result — safely, on a closed course.
Step by step
- Find a closed course. A drag strip test-and-tune night, a track day or a private closed road. Never time runs on public roads.
- Mount the phone. Use a solid dash or vent mount. Any angle is fine; the phone just must not move during the run.
- Stop and stage. Come to a complete stop. Holeshot stages itself: the pre-stage and stage lights come on, then the ambers fill as it confirms you are stationary.
- Wait for green. When the tree goes green, Holeshot is armed. There is no countdown — launch whenever you are ready.
- Launch and lift. The clock starts the instant the car moves. Splits light up as you hit them. Lift off and the run finishes on its own.
- Read the timing card. Your 0-100, 100-200, 60 ft, 1/8 and 1/4 mile, trap speeds, peak g and slope, each compared with your personal best.
What gets measured
Standing start: 0-50, 0-100, 0-150, 0-200 km/h (or 0-30, 0-60, 0-100, 0-130 mph), 100-200 km/h, 60 ft, 100 m, 1/8 mile, 1/4 mile, 500 m, 1/2 mile, 1 km and 1 mile, with trap speed at each distance.
Rolling start: 80-120 km/h, 60-100 km/h, 100-200 km/h, 60-130 mph and similar roll intervals.
FAQ
Should I use 1-ft rollout?
Use it when comparing with US magazine 0-60 figures or drag strip time slips, which both exclude the first foot of movement. Leave it off for a true from-standstill 0-100 km/h.
Holeshot: 0-60 & 0-100 Timer
Motion sensors + GPS at 100 Hz. Every split, every run, hands-free.