Hi,
For 13.5 blinky without a fan I would start around 5.2-5.0. If you are able top fit a fan, you can go near 4.5 easily. Internal ratio on this car is 2.13. So with a spur of 75t you will need a pinion between 30 & 32 for ratios 5.325 & 4.99. If you have a 78T spur you will need pinions between 32 & 34 for 5.19 - 4.88.
final ratio = internal ratio * (spur/pinion)
Cheers
Javier
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