OK I was watchin TV and this add came up about this little computer that hooks up to your cigarette lighter and it measures HP, 0-60, 60-0, 1/4s and lots of others....here is the site. Check it out http://www.gtechpro.com/prod.html

 

It has been out for a while now. It is supposed to be fairly acurate.
It was also posted on another forum that you can get one for free if you buy a set of BFGoodrich v rated tires.

 

hmmmm wonder if it really works as good as they say it does

 

It is real world accurate within about half a second. The reason I state this is becuase you have no idea how much you and your car (with gas and oil) weigh. That is the info you need to get accurate numbers outta the g-tech.