They do have "timed classes" for the lanes you can run in as stated above. And they run the quick 8/top dog for the fastest 8 vechicles (4 door cars/ 4 rails). It is going to be impossible to have equal time to run unless you have an equal number of the same cars. Generally you'll have more street cars than race cars, so if you were to add up the amount of time the street cars run vs. the time the race cars run, you would probably see that the street cars actually get MORE time to run than the race cars.. It's just a matter of volume.. Don't know how to explain it to you any clearer.