Dont know if this has been posted before but thought it worth a post.....
I'm sure you've all heard of Dynolicious for the Apple devices.....
Well here is an excellent program for Android phones that does the same thing, called Dynomaster..
http://dynomaster.trackaroo.com/welcome
Plumbed in my cars details (weight, drag, frontal area, etc..), did a run on a flat straight road in 3rd gear from 40mph-70mph and these were the results..
Very impressed, spot on! Did a low boost run at 1bar and made 170bhp which is also spot on for my spec!
Obviously it's not a serious tool, but a bit of fun and accurate enough for £3.80!

lol