Big o 14.5 gearing

Figure it’s worth a shot to ask on here what’s a good gearing to start with in the 14.5 class at big o? This will be my first time here and have no clue where to start and won’t have enough practice time to figure it out and noticed this track looks much bigger than what I usually run on. My rpms need to be in the 9-9500 range. On a short to medium track I’m turning just under 9200 with a 13/66. Figure I try a 13/63 to start with, I think a 62 or 61 would be better to start with but I don’t have those gears.
 
Figure it’s worth a shot to ask on here what’s a good gearing to start with in the 14.5 class at big o? This will be my first time here and have no clue where to start and won’t have enough practice time to figure it out and noticed this track looks much bigger than what I usually run on. My rpms need to be in the 9-9500 range. On a short to medium track I’m turning just under 9200 with a 13/66. Figure I try a 13/63 to start with, I think a 62 or 61 would be better to start with but I don’t have those gears.
Try these math equations:

9200 × 9500 ÷ 5.07 = 4.90 ratio recommended you should run

So probably run a 14 69 gearing or a 13 64 gearing as suggested by the equation
 
Figure it’s worth a shot to ask on here what’s a good gearing to start with in the 14.5 class at big o? This will be my first time here and have no clue where to start and won’t have enough practice time to figure it out and noticed this track looks much bigger than what I usually run on. My rpms need to be in the 9-9500 range. On a short to medium track I’m turning just under 9200 with a 13/66. Figure I try a 13/63 to start with, I think a 62 or 61 would be better to start with but I don’t have those gears.
Did you race ?
If so what gear set did it end up on ?
 
Its called the recommended gear ratio equation which means you should use this equation: (Rpm ran ÷ RPM wanted × current gear ratio = recommended gear ratio) to find a good gearing
I still don't understand your math.
lets pretend I am turning 6500 rpm with a 4.0 ratio but I want to turn 6800.

so according to you I take RPM ran (6500) divided by the RPM i want (6800) and I get .95588235294117647058823529411765
if i multiply it by my current ratio I get .95588235294117647058823529411765 X 4.0=3.8235294117647058823529411764706 this math shows the my new recommended ratio will actually lower my RPM and only works if my RPM was too high to start with.

Ok lets try the other non working math formula you posted to get a new ratio. 9200 × 9500 ÷ 5.07 = 4.90 ratio recommended you should run.
9200 X 9500= 87,400,000 dived by 5.07=17,238,658.777120315581854043392505 ????

But if actually take my desired RPM and divide it by my actual RPM and then multiply it by my current ratio i get my ratio for the RPM I want to run if my RPM are too low to start with.
 
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