I'm hoping Knaus and Bootie will answer the question on their show. After all Knaus should know about all these little tricks. I just can't figure out if the advantage this gives them outweighs what could be a catastrophic tire failure.
The possibility remains that they tested on the Busch car. I just hate the fact that any win now by RCR in the Chase will be suspect.
A couple of posts from Harvicks board.
"Tire pressure increase as the tires get hotter. When that happens the tire gets harder making the tire lose grip after a given number of laps etc. Letting air seep out at a small rate helps keep ALL the adjustments the same for longer. As well as keeping basically the same "feel".
"RCR had taken 3/100th of the rims of their short track cars because they dont have innerliners so that allowed to the air to escape like a bleeder valve. There is no rule against this but there will be one by next week,"