Brad,
To me all indexes are myths created by number-crazed statisticians. :)
Take no offense, please. I really don't know where our numbers came from
for the jr karts, out of someone's fertile brain, and no one's
complained, including the parents. We run each kart group as a separate
class, so their indexes are not a key part to the program. What is
relevent is they're all having a great time and even learning to be good
sports, which isn't easy with youngsters, even to being gracious
winners. I've had at least one dad express his appreciation for us
running the kids' karts. He says it's really opened up the lines of
communication between him and his son that just weren't there before.
And that's a terrific plus.
I'll save this message and forward it to our "brain," and let him fool
around with it. Right now he's on vacation
--Pat K
Brad Holliday wrote:
>
> Pat,
>
> Do you know how SFR come up with their index?
>
> I did some research on the North Texas Karters website
> (http://www.ntkarters.com/) and came up with a set of index numbers which
> might work for the classing structure I proposed (sorry no data of 60cc
> shifters). I used SFR index of .900 for 80cc junior karts and then derived
> the rest of the numbers. I came up with the indexes by using the track
> records for the track in Denton, TX. It is a .5 mile, 9 turn track....so
> it should be fairly representative of an AX course (the straights are a
> little longer and the turns are a little tighter) I'm sure there are many
> other appropriate tracks throughout the country that keep track records that
> could be added to the mix to fine tune the numbers. This track holds
> national caliber events, so, hopefully the track records are fairly
> representative of what is obtainable.
>
> Here are how the numbers came out. These five classes are reduced from 15
> junior classes, so dividing lines would have to be defined, just like we do
> in other classes. Results list class, record time for class, and index.
>
> 80cc Junior Shifter (per SKUSA) 38.17 0.900
> Junior Sportsman Lite (12-15 2-cycle) 41.86 0.821
> Junior I Lite 2-Cycle (8-11 2-cycle) 42.71 0.804
> Junior II Lite 4-Cycle (12-15 4-cycle) 45.26 0.759
> Junior I Lite 4-Cycle (8-11 4-cycle) 45.45 0.756
>
> For reference:
> 125cc Moto Expert (F125) 36.54 0.940
>
> >Brad,
> > We index all the classes at SFR events, giving everyone an overall
> >index time as well as an overall real time. We divide the Jr. Karts into
> >two levels, I think, the little 5hp, with an index of .836, and the
> >Junior kart like the Garritt Ankeny's at a much tougher .900.
>
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