FWIW the 5.5 i'm running in my 4WD has almost the smallest pinion you can physically get to mesh on the stock spur (think 18 will go, i'm using 19)
and i've gone up on the spur size (from 87 to 89).
Still accelerates like a missile, and only just running out of acceleration at the end of a 20 ish metre straight. (high grip astro)
Don't use a fan on the motor, rarely tops 70. ESC tops out at about the same.
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