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A handy little formula to calculate what gear change you need. The number after the (.) lets say
4.80 to 4.90 (.10) = about 100 r.p.m., you need to know two things, the r.p.m. you are turnimg and
the fimal ratio you have. Take the r.p.m. divide by the final ratio you are running, times that
number by the final ratio you think you need.
Example, lets say we are turning 6000 r.p.m. w/4.80 final, and we want to turn 6500 r.p.m., so
we will try 5.30 final, this is .50 after the (.) and that should be about 500 r.p.m.. If you calculate
this out, you will see it is really 6625 r.p.m., so we need to go closer to what we had. Lets try 5.20
final, as you can see after you calculate it out, that is what we want 6500 r.p.m.
This is only theatrically, it will not be exactly correct on the track, but it will be very close. You
can do the same thing if you want to turn less r.p.m's.
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