I don't know if it's accessible from the US (I don't see why not), but a
lot of people in the UK use a German server, which you can find at:
http://news.cis.dfn.de
This server is completely free, but you do have to register on their
website, using a genuine e-mail address. It "only" carries (IIRC) 18,000
groups, including a lot of national hierachies, but all the useful
motorsport ones are there (including rec.autos.simulators, naturally),
except that it carries no binaries groups.
--
David.
"After all, a mere thousand yards - such a harmless little knoll, really."
(Raymond Mays on Shelsley Walsh)