I thought if you went quicker than .6 under the index, the index for the class got changed before the next pass.
That is for the "personal" index, and does not apply until the following event. It is also only based upon runs in eliminations. They still grade the overall index based upon all the passes made in that class for the year, at year end.
If you ran 8.05 on the 8.75 index at Orlando this weekend, it would change your "personal" index to 8.65 for the next race you entered. The index for everyone else would remain 8.75.
