Not sure where else to post this so if it is in the wrong place I am sorry. I found this Pocket Dyno APP that is really cool and was wondering if anyone else uses it, knows it's accuracy or at least it's repeatability. I was hoping that if it was repeatable I could use it to check if my mods to my car made things better or worse! Any info on this or any other devices out there that I could use to monitor my 1/4 mile runs would be very helpful, Thanks