Ralf
Get in touch with Malcolm Knowles and see if you can still get a copy of his brilliant book called Quinellas,and the software called Simply Quinellas.Neither are expensive,the software used to be 29.95,when I bought the book it was only about $5.Don't know if their would be any left as I got mine years ago.Not sure of his web address,try http://www.inracing.com.au
Can't give you any formulas because copyright laws.
Hope this helps.
cheers