Joe,
You should contact the guys with the SCCA Rally BioDiesel VW Golf TDI. They are huge biodiesel nerds and were eager to share all of their knowledge.
I met them at the Columbus (Ohio) Auto Show a couple of years ago. They were super-excited about their car and had just come off a fairly successful season.
I got to really check out the car (which still had race grime all over it) and I believe that they gave me some freebies as well (soypower stickers and a Kumho lanyard).