So far I've found a number of frequencies between 450.150 and 450.9125 that are being used by the media production folks on site for covering the 24 hour race which started today. A mix of your typical broadcast audio and also directors talking to the various cameras and reporters.
The Daytona Beach Police Department has some trunk groups active on the trunked system that's listed in the database here as the Volusia County EDACS system, using just the 5 freqs listed for the Daytona Beach site. TGIDs 14-003 14-004 14-005 15-010 observed in use.
On the site listed as County East, TGIDs with race related traffic have been 11-066 11-074 15-010
I'll follow up with more posts if I manage to hear any teams or other race related stuff from my location which is away from the track.