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Download a good video editing software from Torrent which measures in the order of millisecs.
Convince your buddy to hold the camera & cover your speedo perfect during sprints.
Try a couple of trials first to know the right speeds for shifting the gears.
It's the best trade off to stay in that turbo band (2500 - 3500 RPM) & min. time during shifting & loose momentum.
Have 5-6 sprints in to extract the best of timings.
Now edit all the videos.
Video start: Last second from the beginning of the video when the speedo indicator@ 0 km/hr (you can also refer 800 RPM@odo for rest position in 1st gear)
Video end: When the speedo indicator@100 km/hr

It will correct your timings by 1/10 th of a second & is the best method IMO if you don't want to buy any costly 0-100 devices. You can add +/- 0.5 secs for offset but it will give you almost correct idea like 13-14 secs, 14-15 secs or 25-26secs:lol. You never know those FGTs:cool

 

Best thing to check the 0-100Kmph, DYNO your car!

 

That won't be good for Morales of FIAT owners as on Dyno, it may exceed 20 secs:mrgreen:
Better to opt above in house pioneered method & settle with 13-14 secs.
It will be a tremendous mental boost:lol

 

@ Jishnu - pretty good stuff man!

 

@Relativity- Thank you so much!