What speedo are you using? I found when using a Speedpassion GTPRO 2.0, that I had to turn it up to near the max to make a V3.0 fast, however using a LRP Sphere, I just plug it in and it's fast.
Normally run between a 19-21t pinion depending on the track. That's outside, have never run it indoors.
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Model Junction, Boughton Raceway.
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