Think the D4 motors are regarded as 1 of the best available but it still comes down to gearing and driving style, 13.5 blinky is very popular in the US and becoming used more and more across Europe. RC tech can be a useful forum for gearing info on motor/chassis/track layout.
Personally I would start around 5 final drive with high end bell timing and run it for 10 laps, grab the motor if it's hot then drop the EBT if not try a pinion 2 teeth bigger or spur 2 smaller and try again,
FDR = Spur/pinion * Internal Ratio
E.g.
5 = 84/32*1.9 (Xray T3/T4)
It's always a trial and error thing as tracks with limited full power area's don't tend to heat the motor too much but braking a lot can also create heat
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