Going back to the old Yahoo group, the consensus was that generally, FRS/GMRS radios fare poorly in this application. Some teams have made them work, but most are dissatisfied with the results. I think it has something to do with these cars being too fast for the slow radio waves the FRS/GMRS radios put out.
Ok, I made up that last part. But the first part is true.
If you look around your local area, there are often two-way radio vendors that have daily, weekend, and multi-day two-way radio rental packages using VHF or UHF systems. Those tend to do better at these events.
BTW, you might not want to tell them that you're going to be using their radios in your crapped out Lemons race car or they might decide not to rent to you. I'm not saying you should lie or anything, but you might want to think about how much voluntary information you want to give out...
Pat Mulry, TARP Racing #67
Mandatory disclaimer: all opinions expressed are mine alone & not those of 24HOL, its mgmt, sponsors, etc.