Been thinking about this some more.
How about if Jim got people to chip in, and made tiers: like "supporter", "hero", and "champion", and made them equivalent to a $100, $250, and $1000 contribution respectively. You'd get a sticker for your car, or maybe a t-shirt, or something that said "I'm a Champion Champion"

Maybe even go so far as give a one-day pass (free racing) for one of those levels -- maybe $100 gets you a T&T day, $1000 gets a race day.
Heck you could even get people and/or companies to pitch in and name things. The "Capital Auto Group Pits" for $10,000, the "John Smith Burnout Box" for $5000, the "Fred Flintstone Staging Lanes" for $2500, that kind of thing. Maybe sell bricks for some walkway somewhere on the property, sell a brick for $100, and let people put whatever they want on it (kids' names, their name, race team name, etc.) that would be there forever.
I've done a lot of fund raising in my time. Just led and completed an $11m campaign for our kid's school. Raising $100k is not hard, just get a couple of folks to chip in big ($5k?) at the beginning to convince people it's for real, and you could get there.
Chris