Hi,
4.8 to 6.0 sounds more like a Ratio for a Touring Car. For a 13.5 i'd use something like 7.5-8 ,depending on the Track.
With my Cougar an Shorty pack i went with 25/76 with LRP X12 13.5T Blinky on a thight Carpet Track. It needed a cooler , but was as fast as the modi Guys on that track (except on the one long straight). But i think x12 has more power than SP, but less rpm.
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