There really isn't a group or forum. Mostly people post on the page of thier local track or whatever track they're going to.

You could set up a "group" for Manhattan area racers and enthusiasts.

On a side note...would you be interested in Jeeping in Colorado next summer? I've got a free room in our cabin in exchange for going Jeeping with me while we're out there. I've had a tough time hooking up with locals, since I wheel during the week when most people are at work, and I don't like to wheel alone out there. We usually go out over the holiday weeks....Memorial, 4th, and Labor. One of those will be a two week trip, just not sure which one yet. Let me know.

All the local and regional track talk seems to have moved to Facebook.