Check out this site and ask a question there. There is lots of knowledge among the members.
http://biodiesel.infopop.cc/6/ubb.x?a=frm&s=447609751&f=159605551
Some people use coolant and electric heaters to boost the temperature before reaching the IP. Check out this site for downloadable step by step files useful for conversions.
http://danalinscott.netfirms.com/
Hope this helps
John