G-Tech vs actual time/speed
 

Has anyone done enough runs with actual time/speed to show how accurate the G-tech accelerometer (or other brands) is compared to the measured values? I live too far away from a 1/4 mile strip (they just closed down Old Dominion Speedway which was nearby) to make regular passes. My two actual 1/4 mile times matched plus/minus about 5%. 0-60 times with a copilot and stopwatch are about the same. I did four runs today to check on some changes I made to the exhaust and G-tech had 4.51, 4.33, 4.61 and 4.55 seconds. Stopwatch was 4.4, 4.4, 4.6 and 4.5 seconds. Did not do 1/4 mile on the 55 mph highway due to concerns about the Virginia DMV taking my license and shoving it up my axx.

not now but you could che the other