Selecting motor + pinion for Cat SX?

[Cassp0nk]

Hi guys,

Decided to treat myself to an RC car after not having had one since I was about 12 (Optima Pro!). Having always liked the CAT and dreamed about getting one as a kid, I thought I'd treat myself to the new model.

Anyway, things have moved on a lot and whilst I've decided to get a brushless, I'm still trying to find info on how many turns motor I should run and what pinion?

From looking at race results on here with people running Cat SXs, it seems a 5.5 turn is pretty much the most popular. How will this be different to a 6.5 turns unit or 4.5 in terms of acceleration, torque and driveability?

Considering the Losi Exleroin + 6.5 combo as they don't do a 5.5. Any recommendation on which pinion would suit?

Also planning to get a trakpower battery. My understanding had been that the capacity dictated runtime + weight, but I've seen comments suggesting they affect acceleration too? Is that just because the smaller capacity lipos don't supply enough current for the motor? Or, if I compare a 5900 vs a 3200, will its be same performance but better run time?


Thanks for any help, read almost all the threads on this forum, but can't find this kind of basic info!