How can I watch nascar live for free on my computer?

May be...

Go to http://satellite-tv-softwares.blogspot.c... Get satellite tv software for your computer,with it you can watch nascar,NBA,NHL,tennis games and many other tv channels live for free on your computer.

You can't. The races are only televised.

Without having some sort of TV to Computer device (such as a Slingbox), the closest thing you will get is NASCAR Trackpass with Raceview through NASCAR.com. It uses GPS transponders on the cars to create digital images of their position on the track and displays a model of that on the screen. This allows you to follow a particular drivers position on the speedway. It can be jerky at times, but this is the closest you will be able to get. Keep in mind, it costs $12.95/month or $79.95/year.fit a tow bar