JUST GO TO YAHOO, AND TYPE IN RICHMOND CAR TEST, DOWNLOAD THE DOS VERSION, ITS FREE. Its one of those things that you cant believe how you ever lived without it.
Not pretty to look at or slick to use, but the results are worthwhile. Apparently, the best way to launch an E28 M5 is to dump the clutch @ 1900 RPM... The race track comparison is also pretty cool. 9min 44sec around the Nrburgring