check out this free online drag racing game --
www.nittotire.com
click on 555challenge when u get there.
there is another similar game at
www.nuke.rpmworld.com/vdr.html
and while i`m here i may as well tell you about
www.millerlite.com ,its another online racing game but instead of driving the car you manage the team, there is a race every week and you have to practice and qualify then submit your race. your prize money can be spent on training your driver and pit crew etc... and you can change the tyre pressure,wing angle,spring rate and gear ratios etc.. on your car to set it up for each track.
have fun