[rboyle]

Pretty sure there is no written rule on this. But there are reasons for it as well. Some run multiple cars or crew for others as well. There is less halp available today than years ago so racers pull double duty. There is also strategy to this during Qualifying or dependent on which round, shade, sun, weather changes etc. or as rounds get later and fewer cars there is less time to cool down and refuel and recheck things. I doubt it's ahead games thing for the most part. If you get rattled that easily you should reevaluate some of your own racing program. Heads up runs can have you making a lot of last minute thrashing too. There are usually reasons for that delay though.