On mine indoors / big track I run kit spur with 23/24 pinion on an 6.5 Orion Vortex.
Orion motors are quite soft and a bit tame, so maybe run a tooth or two lower with faster motors of the same wind - LRP X20 for example.
I tried a 5.5 Vampire this weekend (as I run the Vampire ESC) and by mistake I put the 24 pinion on instead of a 20. I was ballistic but thermaled at around 4mins!
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