Quote:
Originally Posted by Tom C
Nice runs!
The difference between the vbox and the drag strip time is all in the roll-out. The way I stage at the track I have a roll-out of 1.3'. If I deduct that 1.3' from the vbox raw time (without any rollout) I am usually spot on.
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Great runs to BMS!
If you submit the files to vboxtools.com like Terry did above, the software will do the 1-foot roll out and calculate NHRA trap speed as well. However if you use the readout of the vbox itself, you don't get this feature.
In the comparison between vboxtools and actual timeslip above, I see the following correlation:
60' : 0.026 second difference
330' : 0.024 second difference
1/8 Mile ET: 0.018 second difference,
1/8 Mile TP: 0.478 MPH difference, 0.5% error
1000' : 0.010 second difference, 0.10% error
1/4 Mile ET: 0.001 second difference, 0.0% error
1/4 TP: 0.605 MPH difference, 0.4% error
I had one car at the event with three vBox's attached. PBox, Video vBox Pro, and the new 20Hz vBox Sport. I have all the timeslips to compare vBox results. It will be interesting to see if the 20Hz vBox Sport increases the accuracy of the vboxtools.com comparison to actual timeslips.