I might change to a 6.5. First I will try gearing down to a 18t pinion, seems a 20t on a 5.5 is a little too much looking at various setup sheets.
The car has such little resistance, the drive train is very free running and the car is very light. Mine weighs in at c1830 grams in shorty config. All this adds up to a lower wind motor I think.
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